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IS 797 Specification for Common Salt for Chemical Industries (fourth draft revision)
Local Title:
IS 797 Specification for Common Salt for Chemical Industries
Country/Region:
India
Competent Authority:
Bureau of Indian Standards
Type:
Standard
Status:
Draft
Release Date:
2022-09-15
Implementation Date:
2022-09-15
Document
Language Source Title Access
EN
Official IS 797 Specification for Common Salt for Chemical Industries (fdraft revision)
Summary

This Indian Standard (Fourth Revision) was adopted by the Bureau of Indian Standards after, the draft finalized by the Inorganic Chemicals Sectional Committee had been approved by the Chemical Division Council. 

This standard was first published in 1955 and subsequently revised in 1967. The original version included only one grade of the material. In the first revision another grade of the material required for the manufacture of hydrosulphite and optical brightners was incorporated. The standard was again revised in 1976; in the second revision the requirements of magnesium and sulphate contents was modified. In grade 2 of the material, optional requirements for grit content and trace metals like vanadium, chromium, titanium, molybdenum, copper, nickel and aluminium were incorporated for use of the material in the explosive and pyrotechnic industry and electrolytic purposes respectively. The methods of test for the determination of the trace metals were also incorporated. The sampling scheme was also modified accordingly. In third revision, additional requirements for the materials of Grade 2, for use in the explosives and pyrotechnic industry for sulphate, iron and alkalinity were incorporated. The method of test for the determination of alkalinity was also incorporated.

In this revision, instrumental test methods for the determination of sulphates, iron, magnesium and calcium have been added as alternate test methods. Also, Packing and Marking clause has been updated. Further, Reference clause and amendment have been incorporated in this revision.

Obligations