RECOMMENDED 
RESPIRATORY PROTECTIVE DEVICES 
• 'i '< • 
DIVISION OF INDUSTRIAL HYGIENE 
MAY 1944 TABLE OF CONTENTS 
Page 
Where and when respirator is recommended 1 
Approval labels 1 
The use and care of respirators 1 
Cleaning, sterilization and repairing 2 
Definition of Dust, Fume and Mist for purpose of approval 3 
Dust, Fume and Mist Respirators—Type A: Pneumoconiosis-produc- 
ing or Nuisance Dusts 3 
Dust, Fume and Mist Respirators—Toxic Dust 3 
Dust, Fume and Mist Respirators—Type A and Toxic Dust 4 
Dust, Fume and Mist Respirators—Type B : Fume Respirators 4 
Dust, Fume and Mist Respirators — Pneumoconiosis-producing Dust 
and Mist and Chromic Acid Mist Respirators 4 
Chemical Cartridge Respirators—Organic Vapors 9 
Chemical Cartridge Respirators—Acid Gases 9 
Chemical Cartridge Respirators—Organic Vapors and Acid Gases 9 
Gas Masks—Type A : Acid Gas Masks 11 
Gas Masks—Type B : Organic Vapor Gas Masks 11 
Gas Masks—Type AB : Acid Gas and Organic Vapor Gas Masks 11 
Gas Masks—Type C : Ammonia Gas Masks 11 
Gas Masks—Type D : Carbon Monoxide Gas Masks 12 
Gas Masks—Type N : Gas Masks for protection against Acid Gases, Or- 
ganic Vapors, Carbon Monoxide, Ammonia, Smokes, Mists and 
Dusts 12 
Supplied Air Respirators—Type A: Hose Masks 15 
Supplied Air Respirators—Type B: Special Masks and with Blowers 15 
Supplied Air Respirators—Type C : Air Line Respirators 15 
Supplied Air Respirators—Type CE : Abrasive Blasting Helmets, 
Hoods, Masks 15 
Self-Contained Oxygen Breathing Apparatus 20 
Names and Addresses of companies that have received approvals 20 
Photographic acknowledgments 20 LIST OF RESPIRATORY PROTECTIVE DEVICES 
APPROVED BY U. S. BUREAU OF MINES' 
Certification of Approval to January 1# 1943 
The following list of respiratory protective devices, 
their use and care, together with the manufacturers, the 
U. S. Bureau of Mines approval number, and an illustra- 
tion where possible, is prepared for the use of industrial 
plants in Indiana, so that improper respirators will not 
be purchased for protection against harmful dusts, fumes 
or mists. Where these toxic materials are present in the 
air, the Division of Industrial Hygiene of the Indiana State 
Board of Health recommends the use of one of the follow- 
ing respirators that have been approved by the U. S. Bu- 
reau of Mines for the particular dust, fume or mist present. 
However, this Division does not recommend the use of re- 
spirators as the principal control for these harmful sub- 
stances in the air when it is at all possible to control them 
by other means, such as local exhaust at or near the point 
of origin, wet methods in the case of dusts, enclosed proc- 
esses, isolation of the process, substitution of a non-toxic 
for a toxic material, general ventilation or a combination 
of one or more of these methods. 
APPROVAL LABELS 
To provide purchasers and users with a means for 
identifying approved devices and for procuring approved 
parts when making repairs and replacements, the Bureau 
requires that all devices marketed under the provisions 
of the approval system of the Federal Bureau of Mines 
must have an approval label on which is reproduced the 
seal of the Bureau, the approval number, the name of the 
manufacturer to whom the approval is issued, and the 
conditions for which approval is granted. Essential parts 
of the devices are marked with the approval number. The 
markings also obligate the manufacturer to maintain the 
quality of the product and to construct each device, in 
all its parts, in exact accordance with specifications of the 
device that the Bureau examined and approved. Any 
device that exhibits changes in design or includes any 
parts that were not in the device approved, regardless 
of whether the change be made by the manufacturer or 
the consumer, is not permissible and may not bear the 
Bureau of Mines approval label. 
The approval label (metal plate) is affixed to self- 
contained oxygen breathing apparatus. Canister-type gas 
masks bear a label on the case and on each canister, and 
the approval number is marked on the facepiece and 
harness, for example, “BM-1400.” Type A (hose mask) 
and Type B (special hose mask without blower) supplied 
air respirators have the approval label on their cases or 
containers, and the approval number is marked on the 
air-supply arrangement, air-supply line, facepiece and 
harness. Type C (air-line respirator) and Type CE 
(abrasive-blasting respirator) have the approval label 
on their cases (if any) or on a special sheet with instruc- 
tions for use of the device; and the approval number is 
marked on the air-supply line, respiratory-inlet covering 
(facepiece, hood, or helmet), and harness. The containers 
of dispersoid respirators and of replacement-filter units 
bear approval labels, and the approval number is marked 
on the facepiece and each filter unit. The filter units 
also bear a marking that designates the type of particu- 
late matter for which they are approved, as pneumoconi- 
osis-producing and nuisance dusts, toxic dusts and fumes. 
THE USE AND CARE OF RESPIRATORS2 
The term “respirators” or “respiratory protective de- 
vices” refers to a large and varied group of protectors 
worn on the face or over the head of the worker and 
designed to decrease or eliminate the amount of con- 
taminant (dusts, fumes, mists, gases or vapors) in the 
inspired air. One type of respirator (the filter type) pro- 
tects the wearer by filtering out some or all of the harmful 
material from the inspired air, and a second type (the 
supplied-air respirator) protects by supplying clean air 
from a convenient source. 
Respirators are not a substitute for general dust or gas 
control, but are a helpful adjunct. They are used exten- 
sively on jobs such as abrasive blasting, paint chipping, 
handling used storage battery plates, cadmium oxide 
manufacture, welding operations, spraying of paints and 
glazes, the manufacture and use of pigments and dyes and 
the like. Their most important use is under conditions 
where protection is required intermittently as in cleaning 
out operations, sweeping, after blasting, in removing cores 
from large foundry castings, shoveling, screening and 
handling of materials, and the operation and maintenance 
of processing equipment. 
Respirators should not be considered part of the work- 
er’s wearing apparel. They are safety devices and should 
be supplied by the employer. The employer’s duty does not 
stop with the purchase of respirators. He must see that 
they are distributed to all employees who need them. The 
(1) This listing and discussion of the characteristics of re- 
spiratory protective devices (except chemical cartridge respira- 
tors) is reprinted with permission of U. S. Bureau of Mines from 
their circular 7237 (March 1943). 
(2) This section on “The Use and Care of Respirators’’ is re- 
printed with permission of the Industrial Hygiene Foundation, 
Pittsburgh, Pa., from their Preventive Engineering Series Bul- 
letin No. 2, Part 2. workers must be told when to use respirators. They must 
be educated in their proper use—a difficult task which is 
accomplished only by incessant instruction. 
Compared to other methods of dust and fume control, 
respirators are inexpensive. Consequently, little or no 
thought is sometimes given to their maintenance. Only too 
frequently good respirators are purchased, distributed 
carefully, and then forgotten. In a short time, they are 
very dirty and function ineffectively, if at all. 
It is important that respirators be maintained in good 
working condition. Any respirator which is not properly 
kept will soon become very dirty and ineffective. The 
worker will object to wearing a dirty or unsightly respira- 
tor. Furthermore, if the respirator is not properly main- 
tained, it will soon become defective and will not afford the 
necessary protection, even if worn correctly and continu- 
ously. A defective respirator is worse than none because 
the wearer is given a false feeling of security, and will not 
take the precaution which he would take if he had no 
respirator. 
There are two general systems of respirator mainte- 
nance today. They are (1) individual maintenance and 
(2) central maintenance. In the individual maintenance 
system, the care and upkeep of the respirator is left to the 
user. He is supposed to wash, sterilize and repair the 
respirator. In the central maintenance system, all respira- 
tors are assembled at one central point for cleaning and 
repairing. 
Usually the central maintenance system is worked out 
somewhat as follows. Each worker who needs respiratory 
protection is supplied with two respirators. The respira- 
tors are marked with the employment number of the user. 
Respirators may be marked by stamping the number on 
metal parts; riveting metal number plates on the rubber 
masks, and sewing laundry tabs on the headbands. When 
he goes on shift, the worker picks up from a dust free 
storage container (example—cellophane bag) a clean and 
serviced respirator identified by name or employment 
number. At the close of work he returns the now dirty 
respirator to a central collection point. The dirty respira- 
tors are all collected by one man who cleans and repairs 
them in a room laid out for this purpose. One respirator 
per worker is sufficient if the maintenance is carried out 
between shifts. Usually, however, two respirators are sup- 
plied and the repairs and cleaning done by one man on 
the regular shift. The worker in charge of the respirator 
maintenance need not be a new or special worker. It may 
be the man in charge of the stock room, or any individual 
whose work will permit. Frequently the maintenance of 
respirators can be combined with that of other protective 
equipment such as goggles and protective hats. In some 
industries where relatively few respirators are in use, the 
maintenance is one of the duties of the nurse. If possible 
this is highly recommended. 
The advantages of the central over the individual system 
are obvious. Each worker has a clean, well-kept respirator 
daily. He will object less to wearing it, and will get real 
protection at all times. The monetary saving effected by 
the increased life of the parts and decreased need for new 
respirators will usually more than offset the additional 
cost (if any) of setting up and maintaining the central 
system. 
The idea of a central maintenance bureau is not a new 
one. Such bureaus have been in use in a score or more 
industries for several years. The results produced as evi- 
denced by the condition of the respirators and the appar- 
ent satisfaction of the users are remarkable. 
Respirator maintenance usually consists of cleaning, 
sterilizing and repairing. Effective methods of cleaning 
and sterilization are as follows: 
1. Remove filters, felt screens and head bands (if 
elastic). 
2. Wash with a brush and soap in warm water. 
3. Sterilize by (a) immersion for ten minutes in a 
solution of formalin made by placing 1 part of 40 
per cent formaldehyde solution into 9 parts of 
water or 
(b) Dip in a 3 per cent solution of carbolic acid, a 
2 per cent solution of lysol, or a 70 per cent 
solution of denatured alcohol, or 
(c) Subject the respirator to sterilization by a moist 
atmosphere of antiseptic gas, preferably for- 
maldehyde, for a period of ten minutes at room 
temperature. 
4. Following any one of the outlined procedui’es, the 
respirator must be rinsed in clear water and hung 
to dry. 
Many dust respirators employ so-called “long life” 
filters which are intended to be used over and over. Such 
filters are cleaned by blowing the dirt or dust off with 
compressed air; by brushing the surface; or by tapping 
the filter. If the filters are moist, they must be dried 
before the dust can be removed effectively. To remove 
grease and the like, the dust filter discs may be dipped in 
a dry cleaning solution for a very short time. This process 
should be carried out only infrequently because it de- 
creases the life of the filter. 
2 Just, Respirators approved by U. S. Bureau of Mines 
-nee publicat?_on of this bulletin which extends approval date of 
ulletin to September, 19l£, 
riype A: Pneumoconiosis - Producing and Nuisance Dust Respirators. 
i. CESCO RESPIRATOR NO.'9h. Approval BM-2153, issued to Chicago Eve 
Shield Co., March 23, 19h$. 
mk 
12/26/hS DUST. FUME AND MIST RESPIRATORS 
For the purpose of these approvals, the following defi- 
nitions of the terms, “dust,” “fume,” and “mist” are used. 
Dust—Dispersoids or particulate matter, smaller than 
0.1 mm. or 100 microns, formed by the disintegra- 
tion of dry solid materials by such processes as 
crushing, grinding and abrading. 
Fume—Solid dispersoids formed by the condensation of 
vapors such as those from heated metals and other 
substances. 
Mist — Liquid dispersoids formed by the disintegration of 
a liquid by such processes as spray-coating and 
atomizing. 
TYPE A 
Pneumoconiosis-Producing or Nuisance Dust Respirators 
These respirators are approved only for protection 
against the inhalation of pneumoconiosis—(silicosis and 
asbestosis)—producing dusts, such as free silica, and 
asbestos, and nuisance dusts, such as aluminum, cellulose, 
cement, charcoal, coal, coke, flour, gypsum, iron ore, lime- 
stone and wood. 
These respirators are NOT approved for protection 
against metals or their compounds (such as antimony, 
arsenic, cadmium, chromium, lead, manganese, mercury, 
selenium, tellurium, thalium, uranium and vanadium), or 
protection against harmful smokes and fumes. 
1. M.S.A. Comfo Respirator. Approval BM-2101 MSA* 
2. Willson Bag Respirator No. 300. Approval 
BM-2102 WP 
3. Willson Bag Respirator No. 400. Approval 
BM-2103 WP 
4. Pulmosan M-15 Pouch-Type Filter Respirator. 
Approval BM-2104 PSE 
5. Biever Respirator. Approval BM-2105 SSE 
6. Willson Bag Respirator No. 4. Approval 
BM-2106 WP 
7. Pulmosan M-1100 Pouch-Type Filter Respirator. 
Approval BM-2109 PSE 
8. Cover No. 24 Dupor Respirator. Approval 
BM-2111 HSC 
9. Cesco No. 90 Healthguard Respirator. Approval 
BM-2113 CES 
10. McDonald Dustfoe Respirator. Approval 
BM-2115 BFMcD 
11. M.S.A. Dustfoe Respirator. Extension of 
approval BM-2115 MSA 
12. Willson Bag Respirator No. 100. Approval 
HM-2117 WP 
13. Willson Rotiform Respirator No. 200. Approval 
BM-2118 WP 
14. Willson Respirator No. 750. Approval 
BM-2110 WP 
15. Pulmosan D-4100 Duo-Filter Respirator. 
Approval BM-2120 PSE 
16. A. O. R1000 Respirator. Approval BM-2121 AO 
17. Hygeia Filto-Ring No. 28 Respirator. Approval 
BM-2122 HF 
18. Cover Dupor Skin-A-Cat Respirator No. 40. 
Approval BM-2129 HSC 
19. M.S.A. Comfo Respirator. Approval BM-2130 MSA 
20. McDonald Dustfoe Respirator. Approval 
BM-2132 BFMcD 
21. M.S.A. Dustfoe Respirator. Extension of 
approval BM-2132 MSA 
22. M.S.A. Alkali-Dust Respirator. Approval 
BM-2136 MSA 
23. A. O. R9100 Respirator. Approval BM-2137 AO 
24. Willson Respirator No. 5. Approval 
BM-2140 WP 
25. DeVilbiss MSD Respirator. Approval BM-2141 DeV 
26. Willson Respirator No. 10. Approval BM-2146 WP 
Photographs of approved Type A Dust respirators are 
shown in figures 1, 2 and 4, pp. 5, 6, and 8. 
TOXIC DUST 
Toxic Dust Respirators 
These respirators are approved for protection against 
all toxic or poisonous metallic dusts, such as lead, cad- 
mium, arsenic, chromium, manganese, selenium, vanadium 
and their compounds. 
These respirators are NOT approved for protection 
against fumes generated by heating and volatilization, 
such as fumes generated in lead burning and soldering, 
smelting, type founding, and fusing lead glaze and enamel. 
1. M.S.A. Comfo Respirator. Approval BM-2107 MSA* 
2. Pulmosan L-2100 Pouch-Type Filter Respirator. 
Approval BM-2110 PSE 
3. Willson Rotiform Respirator No. 200L. 
Approval BM-2123 WP 
4. Willson Respirator No. 750L. Approval 
BM-2125 WP 
5. McDonald Dustfoe Respirator. Approval 
BM-2126 BFMcD 
♦ Initials of manufacturer. 
3 6. M.S.A. Dustfoe Respirator. Extension of 
approval BM-2126 MSA 
7. Willson Respirator No. 5L. Approval 
BM-2143 WP 
8. A. O. R9100T Respirator. Approval BM-2144 AO 
9. Hygeia Reef No. 12 Respirator. Approval 
BM-2145 HF 
Photographs of approved Toxic Dust Respirators are 
shown in figure 3, p. 7. 
TYPE A AND TOXIC DUST 
Type A and Toxic Dust Respirators 
Protection against a combination of Type A and Toxic 
Dust. NO protection as listed under Type A and Toxic 
Dust. 
1. Willson Bag Respirator No. 400L. Approval 
BM-2108 WP* 
2. Pulmosan ML-3100 Pouch-Type Filter Respirator. 
Approval BM-2112 PSE 
3. Cesco Healthguard No. 91 Respirator. Approval 
BM-2114 CES 
4. Cesco Healthguard No. 92 Respirator. Approval 
BM-2116 CES 
5. Cover Dupor No. 46 Respirator. Approval 
BM-2124 IISC 
6. Willson Respirator No. 752L. Approval BM-2127 WP 
7. M.S.A. Comfo Respirator. Approval BM-2133 MSA 
8. McDonald Dustfoe Respirator. Approval 
BM-2134 BFMcD 
9. M.S.A. Dustfoe Respirator. Extension of 
approval BM-2134 MSA 
10. A. O. R1000T Respirator. Approval BM-2138 AO 
11. Cesco Healthguard No. 94 Respirator. Approval 
BM-2142 CES 
12. McDonald Clear-Vue Dustfoe Respirator. 
Approval BM-2148 BFMcD 
13. M.S.A. Clear-Vue Dustfoe Respirator. Extension 
of approval BM-2148 MSA 
Photographs of approved Type A and Toxic Dust Respir- 
ators are shown in figure 4, p. 8. 
TYPE B 
Fume Respirators 
These respirators are approved for protection against 
the inhalation of fumes (solid dispersoids or particulate 
matter) formed by the condensation of vapors such as 
those from heated substances and from heated metals in- 
cluding lead, manganese, magnesium, aluminum, anti- 
mony, arsenic, copper, chromium, iron, cadmium and zinc. 
These respirators are NOT approved for protection 
against harmful gases, vapors or an insufficiency of 
oxygen. 
1. Willson Respirator No. 770. Approval 
BM-2128 WP* 
2. M.S.A. Comfo Respirator. Approval BM-2139 MSA 
3. Willson Respirator No. 570. Approval BM-2149 WP 
Photographs of approved Fume Respirators are shown 
shown in figure 3, p. 7. 
Pneumoconiosis-Producing Dust and Mist 
and Chromic Acid Mist Respirators 
These respirators are for protection against the in- 
halation of pneumoconiosis-producing dusts, such as free 
silica and asbestos; nuisance dusts, such as aluminum, 
cellulose, cement, charcoal, coal, coke, flour, gypsum, iron 
ore, limestone and wood; pneumoconiosis-producing mist, 
such as is produced by spray coating and atomizing; and 
chromic acid mist, such as is produced in chromium 
plating. 
1. M.S.A. Comfo Respirator. Extension of 
approval BM-2101 MSA* 
2. Willson Respirator No. 750. Extension of 
approval BM-2119 WP 
3. M.S.A. Comfo Respirator. Approval BM-2130 MSA 
4. McDonald Dustfoe Respirator. Approval 
BM-2132 BFMcD 
5. M.S.A. Dustfoe Respirator. Extension of approval 
BM-2132 MSA 
6. Willson Respirator No. 5. Approval BM-2140 WP 
7. McDonald Clear-Vue Dustfoe Respirator. 
Approval BM-2147 BFMcD 
8. M.S.A. Clear-Vue Dustfoe Respirator. Extension 
of approval BM-2147 MSA 
Photographs of approved dispersoid respirators are 
shown in figures 1, 2, 3 and 4, pp. 5, 6, 7, and 8. 
* Initials of manufacturer. 
4 PNEUMOCONIOSIS-PRODUCING AND NUISANCE DUST RESPIRATORS 
M. S. A. Comfo 
BM-2101* — 1-7-35 
FP—F—FT 
BM-2130* — 8-23-39 
p-r-n3 
Willson No. 300 
BM-2102 — 1-21-35 
F—-I—FI' 
Willson No. 400 
BM-2103 — 1-21-35 
F—I—FI° 
Pulmosan M-15 
BM-2104 — 2-9-35 
F—I 
Biever 
BM-2105 — 3-5-35 
F—I 
Willson No. 4 
BM-2106 — 5-27-35 
f—i—Fr 
Pulmoaan M-I100 
BM-2109 — 3-23-36 
F—I 
Cover No. 24 
BM-2111 — 9-15-36 
F—n° 
McDonald and M.S.A. 
Dustfoe 
BM-2115 — 10-8-37 
FP—I—FT 
BM-2132* — 8-23-39 
P_I_Fr 
Willson No. 100 
BM-2117 — 12-27-37 
F—n 
Willson No. 200 
■BM-2118 — 12-30-37 
F—I—FI° 
Willson No. 750 
BM-2119* — 1-3-38 
‘These respirators are also approved for pneumoconiosis-producing, chromic acid, and nuisance mists. 
CODE: F = felt filter; P = paper; and FP = felt + paper. I = inhalation valves. 
FI = iacelet. 0 — use of indicated part is optional. 
Figure 1 
5 PNEUMOCONIOSIS-PRODUCING AND NUISANCE DUST RESPIRATORS 
(Continued) 
Pulmosan D-4100 
BM-2120 — 1-12-38 
F 
A. O. R1000 
BM-2121 — 2-3-38 
F—I 
Hygeia No. 28 
BM-2122 — 3-23-38 
F 
Cover No. 40 
BM-2129 — 7-5-39 
F—I—FI° 
M.S.A. Alkali Dust 
BM-2136 — 12-1-39 
P—I 
A. O. R9100 
BM-2137 — ' 3-6-40 
F 
Willson No. 5 
BM-2140* — 9-28-40 
P—I 
DeVilbiss MSD 
BM-2141 — 10-3-40 
F—I 
Willson No. 10 
BM-2146 — 9-11-41 
F—I—FT 
McDonald and M.S.A. 
Clear-Vue Dustioe 
BM-2147* — 7-16-42 
P—I 
•These respirators ore also approved lor pneumoconiosis-producing, chromic acid, and nuisance mists. 
CODE: F = felt filter; P — paper; and FP = felt -f- paper. I = inhalation valves. 
FI = lacelei. 0 = use of indicated part is optional. 
Figure 2 
6 TOXIC DUST RESPIRATORS 
M. S. A. Comfo 
BM-2107 — 8-9-35 
FP—r_Fr 
Pulmosan L-2100 
BM-21I0 — 7-17-36 
F—I 
Willson No. 200L 
BM-2123 — 4-18-38 
F—-I—FT 
Willson No. 750L 
BM-2125 — 10-19-38 
p—i—rr 
McDonald and M.S.A. 
Dustloe 
BM-2126 — 3-10-39 
FP—I—FI° 
Willson No. 5L 
BM-2143 — 12-19-40 
P—I 
A. O. R9100T 
BM-2144 — 5-19-41 
F 
Hygeia No. 12 
BM-2145 — 7-15-41 
P—I 
FUME RESPIRATORS 
Willson No. 770 
BM-2128 — 4-15-39 
F—I 
M. S. A. Comfo 
BM-2139 — 3-27-40 
p—r 
Willson No. 570 
BM-2149* — 8-7-42 
P—I—FI 
‘This respirator is also approved lor all dusts and for pneumoconiosis-producing, 
chromic acid, and nuisance mists. 
MIST RESPIRATORS—(See footnotes for Pneumoconiosis-Producing and Nuisance, 
Dust Respirators, and Fume Respirators). 
CODE: F = felt filter; P = paper; and FP = felt -(- paper. I — inhalation valves, 
FI =s facelet. ° — use of indicated part is optional. 
Figure 3 
7 DUST RESPIRATORS—(for all dusts) 
Willson No. 400L 
BM-2108 — 9-5-35 
F—I—FI° 
Pulmosan ML-3100 
BM-2112 — 11-30-36 
F—I 
Cesco No. 91 
BM-2114 — 8-8-37 
F—I 
Cesco No. 92 
BM-2116 — 11-8-37 
F—1° 
Cover No, 48 
BM-2124 — 10-3-38 
F—I—FI° 
Willson No. 752L 
BM-2127 — 3-10-39 
F—I—FI° 
M. S. A. Comfo 
BM-2133 — 10-13-39 
P_r_n° 
M. S. A. Comfo 
Navy type facepiece 
1° 
A. O. R1000T 
BM-2138 — 3-16-40 
F—I 
Cesco No. 94 
BM-2142 — 10-3-40 
P 
McDonald and M.S.A. 
Clear-Vue Dustfoe 
BM-2148 — 7-21-42 
P—I 
McDonald and M.S.A. 
Dusifoe 
BM-2134 — 10-13-39 
P—I—n° 
CODE: F = felt filter; P — paper; and FP — felt -f paper. I = inhalation valves. 
FI =s facclet. ° = use of indicated part is optional. 
Figure 4 
8 Chemical Cartridge Respirators approved by U. S. Bureau of Mines since 
publication of t Vis bulletin which extends approval date of bulletin to 
September, 19U5* 
Type B: Organic Vapor Chemical Cartridge Respirators. 
These respirators are approved for respiratory protection in atmos- 
pheres not immediately dangerous to life or containing not more than 
one tenth (0.1) percent organic vapors by volume. 
1. M. S. A. TWIN CARTRIDGE TYPE RESPIRATOR G. M. A. Approval BM-2301, 
Issued to Mine Safety Appliance Co., June 1*, 191*5. 
WILLSON NO. 701 CHEMICAL CARTRIDGE RESPIRATOR. Approval BM-2302, 
issued to Willson Products Inc., August 27, 191*5• CHEMICAL CARTRIDGE RESPIRATORS5 
Although chemical cartridge respirators have not as 
yet been approved by the U. S. Bureau of Mines, they 
do offer effective protection against light concentrations 
of acid gases and organic vapors, provided that the proper 
type of chemical cartridge is used and the cartridge be 
replaced with new cartridge IMMEDIATELY by wearer 
upon noting odor. The noticing of an odor by wearer 
indicates cartridge is exhausted and will give no further 
protection. The use of filters in front of cartridge will 
prevent clogging and should prolong life of cartridge. 
Organic Vapors 
Respiratory protection for exposures to light concen- 
trations of the following: 
Under no conditions should these respirators he used 
in atmospheres deficient in oxygen, or where the presence 
of carbon monoxide or oxides of nitrogen are suspected, 
or where the toxic fume or vapor is odorless. 
These respirators are not to be used as substitutes for 
air line respirators, gas masks or local exhaust ventilation 
systems. Neither are these respirators to be used for the 
protection against any toxic material which is not listed 
herein unless the respirator manufacturer has stipulated 
that the cartridge will completely absorb the toxic mate- 
rial in question. 
Acetaldehyde 
Acetone 
Acrolein 
Alcohols 
Aldehydes 
Acetates 
Benzine 
Benzol 
Carbon Bisulfide 
Carbon Tetrachloride 
Chloroform 
Chloropicrin 
Creosote 
Esters 
Ethers 
Ethyl Chloride 
Ethyl Bromide 
Formaldehyde 
Furfural 
Gasoline 
Kerosene 
Ketones 
Lacquers 
Naphtha 
Nitrobenzene 
Petroleum Spirits 
Phenol 
Tar 
Toluol 
Trichlorethylene 
Turpentine 
1. Willson Chemical Cartridge Respirators—No. 701 
and No. 711 WP* 
2. M.S.A. Chemical Cartridge Respirators—No. 
CR-9281, No. EM-9328 MSA 
Acid Gases 
Respiratory protection for exposures to light concen- 
trations of the following: 
Acetic Acid Hydrogen Sulphide 
Hydrochloric Acid Nitric Acid 
1. Willson Chemical Cartridge Respirators—Nos. 
702 and 712 WP* 
2. M.S.A. Chemical Cartridge Respirators—Nos, 
EM-9328, CR-10373 MSA 
Organic Vapors and Acid Gases 
Respiratory protection for exposure to light concentra- 
tions of the above plus the following: 
Photographs of recommended chemical cartridge respira- 
tors are shown in figure 5, p. 10. 
Sulphuric Acid Sulphur Trioxide 
Sulphur Dioxide 
Photographs of recommended chemical cartridge respira- 
tors are shown in figure 5, p. 10. 
Bromine 
Chlorine 
Dimethyl Sulfate 
Fluorine 
Phosgene 
Pentachloride 
Phosphorus 
Phosphorus Trichloride 
Sulphur Chloride 
Stannic Chloride 
Thiophosgene 
Toluidine 
1. Willson Chemical Cartridge Respirators—Nos. 
703 and 713 WP* 
2. M.S.A. Chemical Cartridge Respirators—Nos, 
CR-10373, EM-9328 MSA 
Photographs of recommended chemical cartridge respira- 
tors are shown in figure 5, p. 10. 
* Initials of manufacturer. 
(3) Chemical cartridge respirators are not approved by the 
F. S. Bureau of Mines. 
9 CHEMICAL CARTRIDGE RESPIRATORS 
M.S.A. Twin Cartridge Respirator 
“Comfo''-type facepiece 
No. CR-9281, No. CR-10373 
M.S.A. Twin Cartridge Respirator 
”U. S. Navy"-type facepiece 
No. EM-9328 
WILLSON 
Nos. 701, 702. 703 
Twin Cartridges 95 cc each 
WILLSON 
Nos. 711. 712, 713 
Twin Cartridges 50 cc each 
Figure 5 GAS MASKS 
NOTE: No gas mask gives protection when there is a deficiency of oxygen. 
TYPE A 
Acid Gas Masks 
Protection against acid gases, such as chlorine, formic 
acid, hydrogen chloride, hydrogen sulfide, phosgene and 
sulfur dioxide. 
1. M.S.A. Hydrocyanic Acid Gas Mask. Approvals 
BM-1413 (regular-size canister) and BM-1414 
(supersize canister) MSA* 
2. Acme Chlorine Gas Mask. Approval BM-1421 APE 
3. M.S.A. Chlorine Gas Mask. Approval BM-1422 MSA 
4. Davis Hydrocyanic Acid Gas Mask. Approval 
BM-1424 DEE 
5. Willson Chlorine Gas Mask. Approval BM-1426 WP 
6. Davis Chlorine Gas Mask. Approval BM-1427 DEE 
7. Willson Hydrocyanic Acid Gas Mask. Approval 
BM-1428 WP 
8. Bullard Chlorine Gas Mask. Approval BM-1430 EDB 
9. Bullard Hydrocyanic Acid Gas Mask. Approval 
BM-1431 EDB 
TYPE B 
Organic Vapor Masks 
Protection against organic vapors, such as acetone, alco- 
hols, aniline, benzene, carbon bisulfide, carbon tetrachlor- 
ide, chloroform, ether, formaldehyde, gasoline and petrol- 
eum distillates and similar volatile compounds. 
1. M.S.A. Organic Vapor Mask. Approval 
BM-1415 MSA* 
2. Davis Organic Vapor Mask. Approval BM-1417 DEE 
3. Acme Organic Vapor Mask. Approval BM-1418 APE 
4. Bullard Organic Vapor Mask. Approval BM-1419EDB 
5. Willson Organic Vapor Mask. Approval BM-1423 WP 
TYPE AB 
Acid Gas and Organic Vapor Masks 
Protection against a combination of A and B—see above. 
1. M.S.A. Acid Gas and Organic Vapor Mask. 
Approval BM-1409 MSA* 
2. M.S.A. Hydrogen Sulfide and Petroleum Vapor 
Mask. Approved BM-1410 MSA 
3. Davis Acid Gas and Organic Vapor Mask. 
Approval BM-1411 DEE 
4. M.S.A. Hydrogen Sulfide and Petroleum Vapor 
Mask. Approval BM-1412 MSA 
5. M.S.A. Hydrogen Sulfide and Petroleum Vapor 
Mask. Approval BM-1416 MSA 
TYPE C 
Ammonia Gas Masks 
Protection against ammonia gas. 
1. M.S.A. Ammonia Gas Mask. Approval 
BM-1401 MSA* 
2. M.S.A. Ammonia Gas Mask. Approval BM-1404 MSA 
3. LaFrance Ammonia Gas Mask. Extension of 
approval BM-1401 ALaF 
4. M.S.A. Ammonia Gas Mask. Approval BM-1406 MSA 
5. Davis Ammonia Gas Mask. Approval BM-1408 DEE 
6. LaFrance Ammonia Gas Mask. Extension of 
approval BM-1408 ALaF 
7. McDonald Ammonia Gas Mask. Extension of 
approval BM-1406 BFMcD 
8. Acme Ammonia Gas Mask. Approval BM-1420 APE 
9. Willson Ammonia Gas Mask. Approval BM-1425 WP 
10. Bullard Ammonia Gas Mask. Approval BM-1429 EDB 
* Initials of manufacturer. TYPE D 
Carbon Monoxide Gas Masks 
Protection against carbon monoxide gas. 
1. M.S.A. Self-Rescuer. Approval BM-1402 MSA* 
TYPE N 
Universal Gas Masks 
Universal gas masks with filters that afford respiratory 
protection against smokes from ordinary fires and lim- 
ited respiratory protection against dusts, fumes, mists, 
and fogs, but do not afford respiratox-y protection against 
the toxic smokes of warfare. 
1. M.S.A. AH-Seiwice Gas Mask. Approval 
BM-1403 MSA* 
2. M.S.A. All-Service Gas Mask. Appi'oval 
BM-1405 MSA 
3. McDonald All-Service Gas Mask. Extension of 
approval BM-1405 BFMcD 
4. Willson WUG-N1 Universal Gas Mask. Appi’oval 
BM-1432 WP 
5. Acme All Purpose Gas Mask. Approval BM-1435 APE 
Universal gas masks with filters that afford respiratory 
protection against toxic dusts, fumes, mists, fogs and 
smokes. 
1. Willson WUG-N2 Universal Gas Mask. Approval 
BM-1433 WP* 
2. M.S.A. All-Service, Model S, Gas Mask. 
Approval BM-1434 MSA 
Photographs of typical approved gas masks are shown 
in figure 6, p. 13. 
* Initials of manufacturer. 
12 Gas Masks approved by U. S. Bureau of Mines since publication of this 
bulletin which extends approval date of bulletin to September, 19ii5>* 
Type Nr Universal Gas Masks 
Universal gas masks with filters that afford respiratory protection 
against smokes from ordinary fires and limited respiratory protection 
against dusts, fumes, mists, and fogs but do not afford respiratory 
protection against the toxic smokes of warfare. 
1. DULLARD UNIVERSAL GAS MASK. Approval BM-ll;3issued to E. D. 
. Bullard Co,, May 16, 19h$* 
Universal gas masks with filters that afford respiratory protection 
against toxic dusts, fumes, mists, fogs, and smokes. 
1. ACME MODEL FD UNIVERSAL GAS MASK. Approval BM-llf36, issued to Acme 
Protection Equipment Co., Inc., October 27, 19h3» 
2. BULLARD UNIVERSAL GAS MASK. Approval BM-lqljO, issued to E. D. 
Bullard Co., May 16, 19h5• 
• ••••••••••••• 
Type B: Organic Vapor Gas Masks 
1. WILLSON ORGANIC VAPOR MASK (large Canister). Approval BM-11+37, 
issued to Willson Products Inc,, August 3', IRlili. TYPICAL APPROVED GAS MASKS 
Willson Universal Gas Mask. 
WUG-N1 BM-1432 
M.S.A. All Service Gas Mask. 
Model S BM-1434 
Acme All-Purpose Gas Mask, 
Type N BM-1435 
La France Ammonia Mask. 
BM-1401 
Davis Organic Vapor Mask. 
BM-1417 
Bullard Organic Vapor Mask. 
BM-1419 
Figure 6 
13 SUPPLIED-AIR RESPIRATORS 
TYPE A SUPPLIED-AIR RESPIRATORS 
Bullard Hose Mask. 
BM-1903 
M.S.A. Combination Hose Mask, 
BM-1905A 
La France Fresh Air Mask. 
Model A BM-1905A 
Davis Hose Mask, 
BM-I90G 
Figure 7 
Acme Supplied-Air Respirator. 
Type A BM-1910 
1 4 SUPPLIED AIR RESPIRATORS 
TYPE A 
Hose Masks 
Respiratory protection against deficiency of oxygen and 
ill harmful gases, vapors, fumes, dusts, smokes and mists. 
1. M.S.A. Combination Hose Mask. Approval 
BM-1901 MSA* 
2. Davis Hose Mask. Approval BM-1902 DEE 
3. Bullard Hose Mask. Approval BM-1903 EDB 
4. Davis Hose Mask. Approval BM-1904 , DEE 
5. M.S.A. Combination Hose Mask. Approval 
BM-1905A MSA 
6. Davis Hose Mask. Approval BM-1906 DEE 
7. LaFrance Fresh Air Mask. Extension of 
approval BM-1905A ALaF 
8. Acme Supplied-Air Respirator, Type A. 
Approval BM-1910 APE 
Photographs of approved Type A supplied-air respira- 
tors are shown in figure 7, p. 14. 
TYPE B 
Special Hose Masks Without Blowers 
LIMITED respiratory protection against deficiency of 
\oxygen and all harmful gases, vapors, fumes, dusts, 
smokes and mists, because of no positive air supply with- 
out blower. 
1. Davis Air-Line Mask. Approval BM-1913 DEE* 
2. Bullard Simplex Hose Mask. Approval BM-1916 EDB 
Photographs of approved Type B supplied-air respira- 
tors are shown in figure 8, p. 16. 
TYPE C 
Air-Line Respirators 
Resiratory protection against deficiency of oxygen and 
all harmful gases, vapors, fumes, dusts, smokes and mists. 
1. M.S.A. Air-Line Respirator. Approval 
BM-1909 MSA* 
2. Willson Air-Line Respirator, Models GA, GB, 
GC. Approval BM-1912 WP 
3. Cesco No. 602 Healthguard Direct Air Mask. 
Approval BM-1917 CES 
Photographs of approved Type C supplied-air respira- 
tors are shown in figure 8, p. 16. 
TYPE CE 
Abrasive Blasting Helmets, Hoods, or Masks 
Respiratory protection against deficiency of oxygen and 
all harmful gases, vapors, fumes, dusts, smokes and mists, 
plus face protection against flying particles. 
1. M.S.A. Abrasive Mask. Approval BM-1907 MSA* 
2. Pangborn Blast Helmet, Type DD-4. Approval 
BM-1908 PC 
3. Sly Purair Helmet. Approval BM-1911 WWS 
4. Willson No. 31 Abrasive Blasting Helmet. 
Approval BM-1914 WP 
5. Pangborn Blast Helmet, Type DF-2. Approval 
BM-1915 PC 
6. Cesco No. 602 Healthguard Mask. Approval 
BM-1918 CES 
Photographs of approved type CE supplied-air respira- 
tors are shown in figure 8, p. 16. 
* Initials of manufacturer. 
15 TYPE B SUPPLIED-AIR RESPIRATORS 
Davir Airline Mask, 
BM-1913 
Bullard Simplex Hose Mask, 
BM-1916 
TYPE C SUPPLIED-AIR RESPIRATORS 
M.S.A. Airline Respirator, 
BM-1909 
M.S.A. Airline Respirator, 
BM-1409 
Willson Airline Respirator, 
BM-1912 
Cesco No. 602 Healthguard Direct 
Air Mask, BM-1917 
Figure 8 
16 TYPE CE SUPPLIED-AIR RESPIRATORS 
M.S.A. Abrasive Mask, 
BM-1907 
Pangborn Blast Helmet, 
DD-4 BM-1908 
Sly Purair Helmet, 
BM-1911 
Willson Abrasive Blasting Helmet, 
No. 31 BM-1914 
Pangborn Blast Helmet, 
DF-2 BM-1915 
Cesco Health Guard Mask, 
No. 602 BM-I918 
Figure 9 
17 SELF-CONTAINED OXYGEN BREATHING APPARATUS 
Gibbs 2-Hour Apparatus (front and back views). 
BM-1300 
Paul 2-Hour Apparatus (front and back views), 
BM -1301 
Fleuss-Davis 2-Hour Apparatus (front and back views), 
BM-I302 
McCaa 2-Hour Apparatus (front and back views), 
BM-1303 
Figure 10 
18 SELF-CONTAINED OXYGEN BREATHING APPARATUS 
Draeger (1924) 2-Hour Apparatus (with side tubes and 
shoulder tubes), BM-I304 
McCaa M.S.A. 
One-Half Hour Apparatus, 
BM-1305 
M.S.A. I-Hour Apparatus (front and back views), 
BM-1306 
Figure 11 
19 SELF-CONTAINED OXYGEN BREATHING APPARATUS 
Self-Contained Oxygen Breathing Apparatus 
Respiratory protection against deficiency of oxygen and 
all harmful gases, vapors, fumes, dusts, smokes and mists. 
1. Gibbs Oxygen Breathing Apparatus. Approval 
BM-1300 MSA* 
2. Paul Oxygen Breathing Apparatus. Approval 
BM-1301 MSA 
3. Fleuss-Davis Proto Oxygen Breathing Apparatus. 
Approval BM-1302 SG 
4. McCaa Oxygen Breathing Apparatus. Approval 
BM-1303 MSA 
5. Draeger Oxygen Breathing Apparatus. 
(1924 type.) Approval BM-1304 DW 
6. McCaa Half-Hour Oxygen Breathing Apparatus. 
Approval BM-1305 MSA 
7. McCaa One-Hour Oxygen Breathing Apparatus. 
Approval BM-1306 MSA 
Photographs of approved oxygen breathing apparatus 
are shown in figures 10 and 11, pp. 18 and 19. 
NAMES AND ADDRESSES OF COMPANIES 
THAT HAVE RECEIVED APPROVALS 
Acme Protection Equipment Co., 3616 Liberty Ave., Pitts- 
burgh, Pa. 
American-LaFrance and Foamite Industries, Inc., Elmira, 
N. Y. 
American Optical Co., Southbridge, Mass. 
E. D. Bullard Co., 275 8th St., San Francisco, Calif. 
Chicago Eye Shield Co., 2300 Warren Boulevard, Chicago, 
111. 
H. S. Cover, Station A., South Bend, Ind. 
Davis Emergency Equipment Co., Inc., 45 Halleck St., 
Newark, N. J. 
The DeVilbiss Co., Toledo, Ohio. 
Draegerwerk, Lubeck, Germany. 
Hygeia Filtering Corporation (formerly the Hygeia Res- 
pirator Co.), 129 East 85th St., New York, N. Y. 
B. F. McDonald Co., 1248 S. Hope St., Los Angeles, Calif. 
Mine Safety Appliances Co., Braddock, Thomas and Meade 
Sts., Pittsburgh, Pa. 
Pangborn Corporation, Hagerstown, Md. 
Pulmosan Safety Equipment Corp., 176 Johnson St., 
Brooklyn, N. Y. 
W. W. Sly Manufacturing Co., 4700 Train Ave., Cleveland, 
Ohio. 
Standard Safety Equipment Co., 75 E. Wacker Drive, 
Chicago, 111. 
Siebe, Gorman & Co., Ltd., London, England. 
Willson Products, Inc., Reading, Pa. 
Photographic Acknowledgments 
The cover picture, courtesy of the United States Public 
Health Service. 
Figures 1, 2, 3, 4, 6, 7, 8, 9 and 10, courtesy of Dr. H. L. 
Schrenk, Director of the United States Bureau of Mines Ex- 
perimental Station, Pittsburgh, Pa. 
Figure 5, courtesy of Mine Safety Appliance Company and 
Willson Products Company. 
20