Sanitation Standards for Propane to be Used in Food Article 3

┌──────────┬───────────────────┐│ Item │ Standards │├──────────┼───────────────────┤│Purity │Not less than 95% (v/v) │├──────────┼───────────────────┤│Characteristics │Colorless, odourless and flammable gas│├──────────┼───────────────────┤│Boiling temperature │-42 ℃ │├──────────┼───────────────────┤│Solubility │One volume of water dissolves 0.065 ││ │volumes at 17.8 ℃ and 753 mmHg; 1 ││ │volume of anhydrous alcohol dissolves ││ │7.9 volumes at 16.6 ℃ and 754 mmHg; 1││ │volume of ether dissolves 9.26 volumes││ │at 16.6 ℃ and 757 mmHg; 1 volume of ││ │chloroform dissolves 12.99 volumes at ││ │21.6℃ and 757 mmHg. │├──────────┼───────────────────┤│Infrared absorption │The spectrum of a sample exhibits ││spectrum │at approximately 3.4μm(vs),6.8μm(s),││ │and 7.2μm(m). │├──────────┼───────────────────┤│Moisture content │Not exceed 0.005 % │├──────────┼───────────────────┤│High-boiling residue│Not exceed 5 mg/kg │├──────────┼───────────────────┤│Acidity of │Add 10 mL of water to the sample, mix ││high-boiling residue│by swirling for about 30 s, add 2 ││ │drops of methyl orange TS, insert the ││ │stopper in the tube, and shake the ││ │tube vigorously. No pink or red color ││ │appears in the aqueous layer. │├──────────┼───────────────────┤│Sulfur compounds │The gas is free from the ││analysis │characteristic odor of sulfur ││ │compounds. │└──────────┴───────────────────┘