The Bureau of Indian Standards (BIS) is consulting on the draft revision to the Indian Standard (IS): Liquid Sulphur Dioxide - Specification (hereinafter referred to as the Standard). The deadline for comments is September 28, 2022.
The Standard prescribes requirements and methods of sampling and test for liquid sulphur dioxide for use as refrigerant, fumigant, bleaching agent, antichlor and as a raw material in synthetic chemical, with reference to the following standards:
Rectified spirit for industrial use - Specification (second revision)
Reagent grade water - Specification (third revision)
1260 (Part 1): 1973
Pictorial markings for handling and labelling of goods: Part 1 Dangerous goods (first revision)
Glossary of terms used in gas industry
According to the Standard, this material shall be of the two grades below:
Grade 1 - for refrigerating and air conditioning industries, and
Grade 2 - for other uses.
It proposes the following requirements for liquid sulphur dioxide:
Color and sediment
To pass test
To pass test
Moisture, parts per million (w/v), Max
Non-volatile residue, parts per million (w/v), Max
Sulphur trioxide and sulphuric acid (as So3), parts per million (m/v), Max
Non-condensable gases in liquid phase, percent by volume, Max
Once the draft is approved, products conforming to the requirements of this standard could be certified with the BIS and be marked with the Standard Mark.