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India Consults on Draft Revised Standard for Liquid Sulphur Dioxide

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: 

IS No.


323: 2009

Rectified spirit for industrial use - Specification (second revision)

1070: 1992

Reagent grade water - Specification (third revision)

1260 (Part 1): 1973

Pictorial markings for handling and labelling of goods: Part 1 Dangerous goods (first revision)

7062: 1973

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:


Requirements for

Grade 1

Grade 2

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.

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