Figure: 25 TAC ยง295.101(c)

List of Toxic Gases with Corresponding Chemical Abstract Service (CAS) Numbers
and Recommended Allowable Concentrations (RACs)

Chemical Name

CAS Number

RAC in ppm

RAC in mg/M3

Ammonia (Anhydrous)

7664-41-7

50

35

Arsine

7784-42-1

0.05

 

Boron trifluoride

7637-07-2

1

3

Butadiene

106-99-0

1

 

Carbon monoxide

630-08-0

50

55

Chlorine

7782-50-5

1

3

Chlorine trifluoride

7790-91-2

0.1

0.4

Diazomethane

334-88-3

0.2

0.4

Diborane

19287-45-7

0.1

0.1

Dimethylamine

124-40-3

10

18

Ethylamine

75-04-7

10

18

Ethylene oxide

75-21-8

1

 

Fluorine

7782-41-4

0.1

0.2

Formaldehyde

50-00-0

0.75

 

Hydrogen bromide

10035-10-6

3

10

Hydrogen chloride

7647-01-0

5

7

Hydrogen cyanide

74-90-8

10

11

Hydrogen fluoride

7664-39-3

3

 

Hydrogen selenide

7783-07-5

0.05

0.2

Hydrogen sulfide

7783-06-4

20

50

Ketene

463-51-4

0.5

0.9

Methylamine

74-89-5

10

12

Methyl bromide

74-83-9

20

80

Methyl mercaptan

74-93-1

10

20

Nitric oxide

10102-43-9

25

30

Nitrogen dioxide

10102-44-0

5

9

Nitrogen trifluoride

7783-54-2

10

29

Oxygen difluoride

7783-41-7

0.05

0.1

Ozone

10028-15-6

0.1

0.2

Perchloryl fluoride

7616-94-6

3

13.5

Phosgene (Carbonyl chloride)

75-44-5

0.1

0.4

Phosphine

7803-51-2

0.3

0.4

Selenium hexafluroide

7783-79-1

0.05

0.4

Stibine

7803-52-3

0.1

0.5

Sulfur dioxide

7446-09-5

5

13

Sulfuryl fluoride

2699-79-8

5

20

Tellurium hexafluoride

7783-80-4

0.02

0.2