| UCSD Toxic and Hazardous Gas Classifications* See abbreviations and footnotes at bottom. |
|
Gas and Formula |
CAS and UN or NA No. |
UBC / CFC Class1 |
UCSD Class2 |
IDLH 3 |
LC504 |
PEL5 |
| Ammonia – NH3 |
7664–41–7, UN1005 |
Corrosive6,7,
flammable |
III |
300 ppm |
4000 ppm |
50 ppm |
| Arsine – AsH3 |
7784–42–1, UN2188 |
Highly toxic,
flammable |
I |
3 ppm |
20 ppm |
0.05 ppm |
| Boron Tribromide – Bbr3 |
10294–33–4, UN2692 |
Toxic |
II |
50 ppm |
380 ppm |
1 ppm5(C) |
| Boron Trichloride – BCl3 |
10294–34–5, UN1741 |
Corrosive6 |
III |
25 ppm8 |
2541 ppm |
5 ppm |
| Boron Trifluoride – BF3 |
7637–07–2, UN1008 |
Toxic |
II |
25 ppm |
806 ppm |
1 ppm5(C) |
| Bromine – Br2 |
7726–95–6, UN1744 |
Highly toxic,
corrosive,
oxidizer |
I |
3 ppm |
113 ppm |
0.1 ppm |
| Carbon Monoxide – CO |
630–08–0, UN1016 |
Flammable6 |
III |
1200 ppm |
3760 ppm |
50 ppm |
| Chlorine – Cl2 |
7782–50–5, UN1017 |
Toxic,
corrosive,
oxidizer |
II |
10 ppm |
293 ppm |
1 ppm5(C) |
| Chlorine Dioxide – ClO2 |
10049–04–4, NA9191 |
Toxic,
oxidizer |
II |
5 ppm |
250 ppm |
0.1 ppm |
| Chlorine Trifluoride – ClF3 |
7790–91–2, UN1749 |
Toxic,
oxidizer |
II |
20 ppm |
299 ppm |
0.1 ppm5(C) |
| Diborane – B2H6 |
19278–45–7, UN1911 |
Highly toxic,
flammable
| I |
15 ppm |
80 ppm |
0.1 ppm |
| Dichlorosilane – SiH2Cl2 (HCl) |
4109–96–0, UN2189 |
Toxic,
corrosive,
flammable |
II |
50 ppm |
314 ppm |
5 ppm5(C) |
| Ethylene Oxide – C2H40 |
75–21–8, UN1040 |
Flammable6 |
III |
800 ppm |
4350 ppm |
1 ppm |
| Fluorine – F2 |
7782–41–4, UN1045 |
Highly toxic,
oxidizer |
I |
25 ppm |
185 ppm |
0.1 ppm |
| Germane – GeH4 |
7782–65–2, UN2192 |
Toxic,
flammable |
II |
6 ppm8 |
622 ppm |
0.2 ppm9 |
| Hydrogen Bromide – HBr |
10035–10–6, UN1048 |
Corrosive6 |
III |
30 ppm |
2860 ppm |
3 ppm |
| Hydrogen Chloride – HCl |
7647–01–0, UN1050 |
Corrosive6 |
III |
50 ppm |
2810 ppm |
5 ppm5(C) |
| Hydrogen Cyanide – HCN |
74–90–8, UN1051 |
Highly toxic,
flammable |
I |
50 ppm |
40 ppm |
10 ppm |
| Hydrogen Fluoride – HF |
7664–39–3, UN1052 |
Toxic |
II |
30 ppm |
1300 ppm |
3 ppm |
| Hydrogen Selenide – H2Se |
7783–07–5, UN2202 |
Highly toxic,
flammable |
I |
1 ppm |
2 ppm |
0.05 ppm |
| Hydrogen Sulfide – H2S |
7783–06–4, UN1053 |
Toxic,
flammable |
II |
100 ppm |
712 ppm |
20 ppm |
| Methyl Bromide – CH3Br |
74–83–9, UN1062 |
Toxic,
flammable |
II |
250 ppm |
1007 ppm |
20 ppm5(C) |
| Methylisocyanate – CH3NCO |
624–83–9, UN2480 |
Highly toxic,
flammable |
I |
3 ppm |
22 ppm |
0.02 ppm |
| Methyl Mercaptan – CH3SH |
74–93–1, UN1064 |
Toxic,
flammable |
II |
150 ppm |
1350 ppm |
10 ppm5(C) |
| Nickel Carbonyl – Ni(CO)4 |
13463–39–3, UN1259 |
Highly toxic,
flammable |
I |
2 ppm |
18 ppm |
0.001 ppm |
| Nitric Oxide – NO |
10102–43–9, UN1660 |
Highly toxic,
oxidizer |
I |
100 ppm |
115 ppm |
25 ppm |
|
Nitrogen Dioxide – NO2 |
10102–44–0, UN1067 |
Highly toxic,
oxidizer |
I |
20 ppm |
115 ppm |
5 ppm5(C) |
| Phosgene – COCl2 |
75–44–5, UN1076 |
Highly toxic |
I |
2 ppm |
5 ppm |
0.1 ppm |
| Phosphine – PH3 |
7803–51–2, UN2199 |
Highly toxic,
pyrophoric |
I |
50 ppm |
20 ppm |
0.3 ppm |
| Phosphorus Oxychloride – POCl3 |
10025–87–3, UN1810 |
Highly toxic |
I |
0.96 ppm8 |
96 ppm |
0.1 ppm9 |
| Phosphorus Pentafluoride – PF 5 |
7647–19–0, UN2198 |
Toxic,
oxidizer |
II |
2.6 ppm8 |
260 ppm |
3 ppm |
| Phosphorus Trichloride – PCl3 |
7719–12–2, UN1809 |
Toxic,
oxidizer |
II |
25 ppm |
208 ppm |
0.5 ppm |
| Selenium Hexafluoride – SeF6 |
7783–79–1, UN2194 |
Highly toxic |
I |
2 ppm |
50 ppm |
0.05 ppm (as Se) |
| Silicon Tetrachloride – SiCl4 (HCl) |
10026–04–7, UN1818 |
Toxic,
corrosive |
II |
50 ppm |
750 ppm |
5 ppm5(C) |
| Silicon Tetrafluoride – SiF4 (HF) |
7783–61–1, UN1859 |
Toxic |
II |
30 ppm |
450 ppm |
0.1 ppm |
| Stibine – SbH3 |
7803–52–3, UN2676 |
Highly toxic,
flammable |
I |
5 ppm |
20 ppm |
0.1 ppm |
| Sulfur Dioxide – SO2 |
7446–09–5, UN1079 |
Corrosive6 |
III |
100 ppm |
2520 ppm |
5 ppm |
| Sulfuryl Fluoride – SO 2F2 |
2699–79–8, UN2191 |
Corrosive6 |
III |
200 ppm |
3020 ppm |
5 ppm |
| Tellurium Hexafluoride – TeF6 |
7783–80–4, UN2195 |
Highly toxic |
I |
1 ppm |
25 ppm |
0.02 ppm (as Te) |
| Titanium Tetrachloride – TiCl4 |
7550–45–0, UN1838 |
Highly toxic,
corrosive |
I |
1.3 ppm |
119 ppm |
— |
| Tungsten Hexafluoride – WF6 (HF) |
7783–82–6, UN2196 |
Toxic,
corrosive |
II |
30 ppm |
217 ppm |
0.1 ppm |
(Table adapted from Santa Clara County's Hazardous Gas Table.)
Back to top
Footnotes:
- UBC/ CFC Class:
- UBC (Uniform Building Code)
- CFC (California Fire Code)
- Class as defined in CFC:
- Health hazards per Article 2
- Highly toxic = < 200 LC50
- Toxic = 201–2000 LC50
- Physical hazards per CFC Standard 7903.
- UCSD Hazard Class defined as:
- Class I = < 200 LC50
- Class II = 201–2000 LC50
- Class III = 2001–5000 LC50
- IDLH values published in 1994 by the National Institute for Occupational Safety and Health (NIOSH).
- LC50 data: Lowest reported value, 1 hour adjusted, taken from Dept. of Transportation, Compressed Gas Association, Registry of Toxic Effects of Chemical Substances.
- PEL (Permissible Exposure Limit) values published by Occupational Safety & Health Administration (OSHA), 29 Code of Federal Regulations, Part 1910.1000, Table Z–1, 7/1/95. OSHA values used if available; otherwise, Threshold Limit Values (TLV) from American Conference of Governmental Industrial Hygienists (ACGIH) or Cal/Occupational Safety & Health Administration (Cal/OSHA) values used.
(C) = TLV-ceiling limit, an exposure limit not to be exceeded under any circumstances.
- Moderately toxic as adopted by the cities of San Jose, Santa Clara, and Milpitas: LC50 = 2,000–5000.
- When used as a refrigerant, Uniform Building Code Class does not apply.
- IDLH determined by 0.01 of LC50.
- Cal/OSHA PEL, Title 8, Section 5155, 9/1/95.
Back to top
If you are a UCSD employee with questions, contact an EH&S Research Assistance Program specialist.
|
At Your Service Online
