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C2H4O (CH3CHO)
Name
Acetaldehyde (Acetic aldehyde, ethanal,  Ethyl aldehyde)

CAS nr.
75-07-0

Measuring ranges
Standard range: 
0 - 2 ppm
High range: 0 - 20 ppm

TLV level (TLV-TWA)
25 ppm (ceiling)

Relative density (compared to air):
1.52

Bionics Instrument Toxic Gas code
TG-1900