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C2H4O
Name
Ethylene oxide (1,2-Epoxyethane, Oxirane, Dimethylene oxide, Eto)

CAS nr.
75-21-8

Measuring ranges
Standard range: 
0 - 20 ppm
High range: 0 - 200 ppm

TLV level (TLV-TWA)
1 ppm

Relative density (compared to air):
1.52

Bionics Instrument Toxic Gas code
TG-2200