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022009CSTLVs_Introduction
2009
Threshold Limit Values
for Chemical Substances
in the Work Environment
Adopted by ACGIH
?
with Intended Changes
Contents
Committee Members 2
Introduction3
General Information3
Definition of the TLVs? 3
Types of TLVs? 4
Excursion Limits5
TWA and STEL versus Ceiling (C)5
Mixtures6
Deviation in Work Conditions and Work Schedules6
Application of TLVs? to Unusual Ambient Conditions 6
Unusual Work Schedules 7
TLV? Units 8
User Information 8
References and Selected Readings 9
Adopted Threshold Limit Values10
2009 Notice of Intended Changes62
Chemical Substances and Other Issues Under Study 65
Definitions and Notations67
Adopted Appendices
A. Carcinogenicity 73
B. Particles (insoluble or poorly soluble) Not
Otherwise Specified [PNOS] 74
C. Particle Size-Selective Sampling Criteria
for Airborne Particulate Matter74
D. Commercially Important Tree Species Suspected
of Inducing Sensitization77
E. Threshold Limit Values for Mixtures 78
F. Minimal Oxygen Content 81
G. Substances Whose Adopted Documentation and TLVs? Were
Withdrawn for a Variety of Reasons, Including Insufficient
Data, Regrouping, Etc. 86
H. Reciprocal Calculation Method for Certain Refined
Hydrocarbon Solvent Vapors89
T
L
V
?
–
C
S
2 — Members
T
L
V
?
–
C
S
2008 TLV? CHEMICAL SUBSTANCES COMMITTEE
Terry Gordon, PhD — Chair
Robert Spirtas, DrPH — Vice Chair
William S. Beckett, MD, MPH
Philip L. Bigelow, PhD, CIH, ROH
Dennis M. Casserly, PhD, CIH
B. Dwight Culver, MD
Alison C. Elder, PhD
Deborah C. Glass, PhD, MA, MSc
Ian A. Greaves, MD
Gregory L. Kedderis, PhD
Gerald L. Kennedy, Jr., DABT
David A. Macys, MS, CIH, DABT
David C. May, ScD, CIH, PE
James N. McDougal, PhD
Bruce Naumann, PhD, DABT
Rachel Rubin, MD, MPH
Darius D. Sivin, PhD
Elizabeth K. Weisburger, ScD, PhD
W.H. (Bill) Wells, Jr., PhD, CIH, CSP
ACGIH? also appreciates the contributions of the following individual:
Aleksandr B. Stefaniak — ACGIH? Bloomfield Awardee
Help ensure the continued development of
TLVs
?
and BEIs
?
. Make a tax deductible d
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