On Wed, 02 Nov 2011 13:03:39 -0700, mike wrote:



They refused to tell me the
concentrations of various impurities normally found in natural gas.

I imagine they could do that years ago. Today, just ask for an MSDS
sheet. They have them and will send it to you.

Google is your friend


SECTION II: COMPONENTS AND HAZARDS
COMPONENT FORMULA CAS NO. VOL% (TYP.) TLV (PPM) DOT#
Methane CH4 74-82-8 93.5 N/A UN1971
Ethane C2H6 74-84-0 3.8 N/A UN1035
Propane C3H8 74-98-6 1.0 1,000 UN1978
i-Butane C4H10 75-28-5 0.1 N/A UN1969
n-Butane C4H10 106-97-8 0.1 800 UN1011
i-Pentane C5H12 78-78-4 0.1 350 UN1265
n-Pentane C5H12 109-66-0 0.1 600 UN1265
n-Hexane C6H14 110-54-3 0.1 50 UN1208
Carbon Dioxide CO2 124-38-9 0.3 10,000 [OSHA] UN1013
Nitrogen N2 7727-37-9 1.2 N/A UN1066
t-Butyl Mercaptan C4H10S 75-66-1 30 ppm N/A UN2347
Methyl Ethyl Sulfide C2H6S 624-89-5 3 ppm 40,250 UN1993
Hydrogen Sulfide H2S 7783-06-4 5 ppm 10 UN1053