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.i e MORANDUM
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DEPARTMENT OF HEALTH. EDUCATION, AND V/F.U`A tv
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NATIONAL INSTITUTE I O?. Ot-UII'ATIONAL iAILTY AND HEALTH
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TO Edward J. Baler Acting Director. NIOSH
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DATE: October 18, 1974
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FROM
Acting Director, Office of Research
. aud Standards Development
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SUBJECT: Respirator Use Recommendations for Vinyl Chloride/* *
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The current
NIOSH
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respiratory protection
recommendations,
as
expressed in the Recommended Standard for Occupational Exposure
to Vinyl Chloride, calls for use of positive-pressure supplied
air*respirators where there is detectable
chloride*. ,,
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exposure *. .
to vinyl .
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J.n preparing for the above recommendation, the NIOSH Engineering
Branch in Cincinnati tested organic vapor canisters and.cartridges *
for effectiveness agni.nst vinyl chloride. An Evaluation of`Organic
Vapor Respirator Cartridges and Canisters Against Vinyl Chloride,
by David L. Smith*and William S. Giesler (NIOSH Publication No. 75-111)
describes these tests.and supports the above recommendations.
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On
September
19,. 1974,
Hr. Grover
Wrenn
of
CSHA, ^
met
with Messrs.
Lynch, Cudeman, and Bryant of NIOSH, to discuss respiratory
protection against vinyl chloride. Mr. Wrenn indicated then that
OSHA was determined to permit use of powered air-purifying
respirators and gas masks for vinyl chloride respiratory protection
for routine and non--routine use, respectively.
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OSHA, subsequently, revised these proposed use requirements and
the Occupational Safety and Health Standard for Exposure to
Vinyl Chloride which appeared in the October 4, 1974, Federal
jteisfeet (39 rR 35390), contained the following general
requirements:
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1* Respirator use is voluntary.
2. MESA/HIOSU approved respirators shall be used. ft
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3.*. A respirator program shall be established and maintained.
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VAB.0001042164
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* A* The following.respirators may be used.
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Over 3,600 ppm
. positive pressure SCBA
Not over 3,600 ppm
supplied air respirators
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(positive pressure)
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Not over 100 ppm
supplied air respirators
Not over 25 ppm
powered air purifying respirator
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* gas mash (4 hour:; service life up to 25 ppm).
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* * Not* ove*r 10h ppm
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chemical cartridge respirator
(1 hour service life up to 10
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The above respirator use requirements in item A are based on
ppm) expected
>. . performance criteria that would reduce the vinyl chloride
concentration in. the wearer's breathing to acceptable levels.
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* No canister or cartridge nasks are currently available which !f.eac
NIOSll requirements nor are any expected to be.approved during this
year
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Consequently, the original recommendation by N10SH is to be reiterated,
,e employees entering any regulated area shall be provided with and
required to wear and use .a full-face, supplied air respirator, of the
continuous flow or.pressure, demand type in accordance with 1910,134,
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In response to this publication, the NIOSll Engineering Branch has
prepared test requirements for, and TCL is preparing to apprev-j,
canisters and cartridges meeting the following general performance
p
requirements:
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Test Concentration,
Service life,
Device
2 Vinvl Chloride
hours
4
Canister
25
6
Air-purifying
cartridge *
Powered airpurifying cartridge
10 25
2 6
Each type of device shall be equipped with an end-of-service life
Indicator. `The approved devices would bear labels requiring careful
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fitting to the respirator wearer and strict quality control of
sorbent materials which would be required
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VAB*0001042165