## Current AIHA ERPG Values (2009)

**Chemical (CAS Number) ERPG–1**  **ERPG–2 ERPG–3** 

Acetaldehyde (75-07-0) 10 ppm 200 ppm 1000 ppm Acetic Acid (64-19-7) 5 ppm 35 ppm 250 ppm Acetic Anhydride (108-24-7) 0.5 ppm 15 ppm 100 ppm Acrolein (107-02-8) 0.05 ppm 0.15 ppm 1.5 ppm Acrylic Acid (79-10-7) 2 ppm 50 ppm 750 ppm Acrylonitrile (107-13-1) 10 ppm 35 ppm 75 ppm Allyl Chloride (107-05-1) 3 ppm 40 ppm 300 ppm Ammonia (7664-41-7) 25 ppm 150 ppm 750 ppm **Arsine (7784-42-1)* NA† 0.5 ppm 1.5 ppm** Benzene (71-43-2) 50 ppm 150 ppm 1000 ppm Benzoyl Chloride (98-88-4) 0.3 ppm 5 ppm 20 ppm Benzyl Chloride (100-44-7) 1 ppm 10 ppm 50 ppm Beryllium (7440-41-7) NA† 25 μg/m 3 100 μg/m 3 **Bis (Chloromethyl) Ether**

**(542-88-1)* ID‡ 0.1 ppm 0.5 ppm** **Boron Trifluoride (7637-07-2)* 2 mg/m****3 30 mg/m** **3 100 mg/m** **3** Bromine (7726-95-6) 0.1 ppm 0.5 ppm 5 ppm 1,3-Butadiene (106-99-0) 10 ppm 200 ppm 5000 ppm n-Butyl Acetate (123-86-4) 5 ppm 200 ppm 3000 ppm n-Butyl Acrylate (141-32-2) 0.05 ppm 25 ppm 250 ppm n-Butyl Isocyanate (111-36-4) 0.01 ppm 0.05 ppm 1 ppm Carbon Disulfide (75-15-0) 1 ppm 50 ppm 500 ppm Carbon Monoxide (630-08-0) 200 ppm 350 ppm 500 ppm Carbon Tetrachloride (56-23-5) 20 ppm 100 ppm 750 ppm Chlorine (7782-50-5) 1 ppm 3 ppm 20 ppm Chlorine Dioxide (10049-04-4) NA† 0.5 ppm 3 ppm Chlorine Trifluoride (7790-91-2) 0.1 ppm 1 ppm 10 ppm 1-Chloro-1,1-Difluoroethane

(HCFC-142b) (75-68-3) 10,000 ppm 15,000 ppm 25,000 ppm 2-Chloro-1,1,1,2-Tetrafluoroethane

(2837-89-0) 1,000 ppm 5,000 ppm 10,000 ppm Chloroacetyl

Chloride (79-04-9) 0.05 ppm 0.5 ppm 10 ppm o-Chlorobenzylidene

Malononitrile (2698-41-1) 0.005 mg/m 3 0.1 mg/m 3 25 mg/m 3 Chloroform (67-66-3) NA† 50 ppm 5000 ppm **Chloromethyl Methyl Ether***

**(107-30-2) NA† 1.0 ppm 10 ppm** Chloropicrin (76-06-2) 0.1 ppm 0.3 ppm 1.5 ppm Chlorosulfonic Acid (7790-94-5) 2 mg/m 3 10 mg/m 3 30 mg/m 3 Chlorotrifluoroethylene (79-38-9) 20 ppm 100 ppm 300 ppm Cobalt Hydrocarbonyl (16842-03-8) ID‡ 0.13 ppm 0.42 ppm

(Value is given as cobalt.) Crotonaldehyde (4170-30-3) 0.2 ppm 5 ppm 15 ppm



### 24

## E
R
P
G Cyanogen Chloride (506-77-4) NA† 0.4 ppm 4 ppm Diborane (19287-45-7) NA† 1 ppm 3 ppm 1,2-Dichloroethane (107-06-2) 50 ppm 200 ppm 300 ppm 2,4-Dichlorophenol (120-83-2) 0.2 ppm 2 ppm 20 ppm Dicyclopentadiene (77-73-6) 0.01 ppm 5 ppm 75 ppm 1,1-Difluoroethane (HFC 152a)

(75-37-6) 10,000 ppm 15,000 ppm 25,000 ppm Diketene (674-82-8) 1 ppm 5 ppm 20 ppm Dimethylamine (124-40-3) 0.6 ppm 100 ppm 350 ppm Dimethyldichlorosilane (75-78-5) 2 ppm 10 ppm 75 ppm Dimethyl Disulfide (624-92-0) 0.01 ppm 50 ppm 250 ppm Dimethylformamide (68-12-2) 2 ppm 100 ppm 200 ppm Dimethyl Sulfide (75-18-3) 0.5 ppm 1000 ppm 5000 ppm Dowtherm J (25340-17-4) 10 ppm 100 ppm 500 ppm Dowtherm Q (68987-42-8) ID‡ 150 mg/m 3 ID‡ Epichlorohydrin (106-89-8) 5 ppm 20 ppm 100 ppm Ethyl Acrylate (140-88-5) 0.01 ppm 30 ppm 300 ppm Ethyl Chloroformate (541-41-3) ID‡ 5 ppm 10 ppm 2-Ethyl hexanol (104-76-7) 0.1 ppm 100 ppm 200 ppm Ethylene Oxide (75-21-8) NA† 50 ppm 500 ppm Ethylidene Norbornene

(16219-75-3) 0.2 ppm 100 ppm 500 ppm Fluorine (7782-41-4) 0.5 ppm 5 ppm 20 ppm Fluorosulfonic acid (7789-21-1) 2 mg/m 3 10 mg/m 3 30 mg/m 3 Formaldehyde (50-00-0) 1 ppm 10 ppm 25 ppm Furfural (98-01-1) 2 ppm 10 ppm 100 ppm Gluteraldehyde (111-30-8) 0.2 ppm 1 ppm 5 ppm HCFC-123 (306-83-2) ID‡ 1000 ppm 10,000 ppm Hexachlorobutadiene (87-68-3) 1 ppm 3 ppm 10 ppm Hexafluoroacetone (684-16-2) NA† 1 ppm 50 ppm **Hexafluoropropylene***

**(116-15-4) 10 ppm 50 ppm 500 ppm** 1-Hexene (592-41-6) NA† 500 ppm 5,000 ppm Hydrazine (302-01-2) 0.5 ppm 5 ppm 30 ppm Hydrogen Chloride (7647-01-0) 3 ppm 20 ppm 150 ppm Hydrogen Cyanide (74-90-8) NA† 10 ppm 25 ppm **Hydrogen Fluoride (7664-39-3)* 2 ppm 20 ppm 50 ppm** Hydrogen Peroxide (7722-84-1) 10 ppm 50 ppm 100 ppm Hydrogen Selenide (7783-07-5) N/A 0.2 ppm 2 ppm Hydrogen Sulfide (7783-06-4) 0.1 ppm 30 ppm 100 ppm Iodine (7553-56-2) 0.1 ppm 0.5 ppm 5 ppm Isobutyronitrile (78-82-0) 10 ppm 50 ppm 200 ppm 2-Isocyanatoethyl

Methacrylate (30674-80-7) ID‡ 0.1 ppm 1 ppm Isoprene (78-79-5) 5 ppm 1000 ppm 4000 ppm Isopropyl Chloroformate (108-23-6) ID‡ 5 ppm 20 ppm **Chemical (CAS Number) ERPG–1**  **ERPG–2 ERPG–3** 



### 25Lithium Hydride (7580-67-8) 25 μg/m 3 100 μg/m 3 500 μg/m 3 Maleic Anhydride (108-31-6) 0.2 ppm 2 ppm 20 ppm Mercury Vapor (7439-97-6) N/A 0.25 ppm 0.5 ppm Methanol (67-56-1) 200 ppm 1000 ppm 5000 ppm Methyl Bromide (74-83-9) NA† 50 ppm 200 ppm Methyl Chloride (74-87-3) NA† 400 ppm 1000 ppm Methyl Chloroformate (79-22-1) NA† 2 ppm 5 ppm Methyl Iodide (74-88-4) 25 ppm 50 ppm 125 ppm Methyl Isocyanate (624-83-9) 0.025 ppm 0.25 ppm 1.5 ppm Methyl Mercaptan (74-93-1) 0.005 ppm 25 ppm 100 ppm **Methyl tert-Butyl Ether**

**(1634-0404) 5 ppm 1000 ppm 5000 ppm** Methylene Chloride (75-09-2) 300 ppm 750 ppm 4000 ppm Methylene Diphenyl Diisocyanate

(MDI) (101-68-8) 0.2 mg/m 3 2 mg/m 3 25 mg/m 3 Methyltrichlorosilane (75-79-6) 0.5 ppm 3 ppm 15 ppm Monomethylamine (74-89-5) 10 ppm 100 ppm 500 ppm Nitric Acid WFNA (7697-37-2) 1 ppm 6 ppm 78 ppm Nitrogen Dioxide (10102-44-0) 1 ppm 15 ppm 30 ppm Nitrogen Trifluoride (7783-54-2) NA† 400 ppm 800 ppm 1-Octene (111-66-0) 40 ppm 800 ppm b 2000 ppma Perchloroethylene (127-18-4) 100 ppm 200 ppm 1000 ppm **Perfluoroisobutylene (382-21-8)* NA† 0.1 ppm 0.3 ppm** Phenol (108-95-2) 10 ppm 50 ppm 200 ppm **Phosgene (75-44-5)* NA† 0.5 ppm 1.5 ppm** Phosphine (7803-51-2) NA† 0.5 ppm 5 ppm Phosphorus Pentoxide (1314-56-3) 1 mg/m 3 10 mg/m 3 50 mg/m 3 Phosphorus Trichloride

(7719-12-2) 0.5 ppm 3 ppm 15 ppm **Propylene Glycol Methyl Ether Acetate**

**(108-65-6** α**-isomer) (70657-70-4**  β**-isomer) 50 ppm 1000 ppm 5000 ppm** Propylene Oxide (75-56-9) 50 ppm 250 ppm 750 ppm **Sodium Hydroxide***

**(1310-73-2) 0.5 mg/m 3**  **5 mg/m 3**  **50 mg/m 3**  **Stibine (7803-52-3)* ID‡ 0.5 ppm 1.5 ppm** Styrene (100-42-5) 50 ppm 250 ppm 1000 ppm Sulfur Dioxide (7446-09-5) 0.3 ppm 3 ppm 15 ppm Sulfuric Acid (Oleum [8014-95-7],

Sulfur Trioxide [7446-11-9], and Sulfuric Acid [7664-93-9]) 2 mg/m 3 10 mg/m 3 30 mg/m 3 **Sulfuryl Chloride (7791-25-5) 0.3 ppm 3 ppm 15 ppm** Tetrachlorosilane (10026-04-7) 0.75 ppm 5 ppm 37 ppm Tetraethoxysilane (78-10-4) 25 ppm 100 ppm 300 ppm Tetrafluoroethylene (116-14-3) 200 ppm 1000 ppm 10,000 ppm Tetrahydrofuran (109-99-9) 100 ppm 500 ppm 5000 ppm **Chemical (CAS Number) ERPG–1**  **ERPG–2 ERPG–3** 



### 26Tetramethoxysilane (681-84-5) NA† 10 ppm 20 ppm Thionyl Chloride (7719-09-7) 0.2 ppm 2 ppm 10 ppm
Titanium Tetrachloride (7550-45-0) 5 mg/m 3 20 mg/m 3 100 mg/m 3 Toluene (108-88-3) 50 ppm 300 ppm 1000 ppm Toluene 2,4- (2,6-) Diisocyanate

(TDI) (584-84-9), (91-08-7) 0.01 ppm 0.15 ppm 0.6 ppm 1,1,1-Trichloroethane (71-55-6) 350 ppm 700 ppm 3500 ppm **Trichloroethylene* (79-01-6) 100 ppm 500 ppm 5000 ppm** Trichlorosilane (10025-78-2) 1 ppm 3 ppm 25 ppm Triethoxysilane (998-30-1) 0.5 ppm 4 ppm 10 ppm **Trimethoxysilane* (2487-90-3) 0.5 ppm 2 ppm 5 ppm** Trimethylamine (75-50-3) 0.1 ppm 100 ppm 500 ppm Trimethylchlorosilane (75-77-4) 3 ppm 20 ppm 150 ppm Triuranium Octaoxide (1344-59-8) ID‡ 10 mg/m 3 50 mg/m 3 Uranium Dioxide (1344-57-6) ID‡ 10 mg/m 3 30 mg/m 3 Uranium Hexafluoride (7783-81-5) 5 mg/m 3 15 mg/m 3 30 mg/m 3 Uranium Trioxide (1344-58-7) ID‡ 0.5 mg/m 3 3 mg/m 3 Vinyl Acetate (108-05-4) 5 ppm 75 ppm 500 ppm Vinyl Chloride (75-01-4) 500 ppm 5000 ppm 20,000 ppm Vinyl Trichlorosilane (75-94-5) 0.5 ppm 5 ppm 50 ppm Vinylidene Chloride (75-35-4) ID‡ 500 ppm 1000 ppm

**Bold:** Part of 2009 Update Set
* 2009 revised document (ERPG–1: 2 ppm; ERPG–2: 50 ppm; ERPG–3: 170 ppm) NA† = not appropriate ID‡ = insufficient data

a This level is 25% of the lower explosive level. b This level is 10% of the lower explosive level. NOTE: This information is correct as of January 1, 2009. It is possible that an ERPG under review by the Committee will be balloted and approved in 2009, making it eligible for inclusion in the 2009 ERPG Document Set. 

## ERPG Values Under Ballot, Review,
and Consideration
These chemicals are under consideration or review by the
AIHA ERP Committee:

Benzene
Boron trifluoride 1,3-Butadiene n-Butyl acetate Carbon disulfide
Carbon monoxide 1-Chloro-1,1- (HCFC-142b) Chloroacetophenone
Chloroacetic acid Chloroacetyl chloride
Chloroform Chloromethyl methyl ether Chloropicrin
Chlorosulfonic acid 

## E
R
P
G

27 **Chemical (CAS Number) ERPG–1**  **ERPG–2 ERPG–3** 

### 28 Cyanogen chloride
Diborane 1,2-Dichloroethane Diesel/Fuel Oil/Kerosene Dimethyl disulfide Dimethyl sulfate Ethyl acrylate
Ethanol
Fluorine Formaldehyde
Formic acid
Furfural
Gasoline Hydrogen chloride Hydrogen peroxide Hydroquinone
Iodine Isocyanuric acid Methyl bromide Methyl mercaptan Methylene diphenyl

diisocyanate (MDI) Naphthalene 1-Octanol Phosphine Phosphoric acid Polyethylene glycol Polypropylene Propylene glycol

momomethylether acetate Propylene oxide Quinoline
Sodium chloroacetate
Sulfur dioxide Sulfuryl chloride Sulfuryl fluoride
Tetrachlorosilane Tetraethoxysilane Tetramethoxysilane Thionyl chloride
Toluene Toluene 2,4-(2,6-)

Diisocyanate (TDI) 1,1,1-Trichloroethane
Trichlorosilane Trimethyl Chlorosilane