General requirements for the supply of metallurgical materials (Second Revision)
2
IS 1817: 1961
Methods of sampling non - Ferrous metals for chemical analysis
3
IS 1940: 1969
Methods of chemical analysis of tin ingot (First Revision)
Sl.No.
Synosis Points
1
The standard covers the requirement of refined tin produced from primary or secondary tin bearing materials in the form of ingots.
2
This standard was first published in 1950 and subsequently revised in 1956, 1966, 1977 and subsequently revised in 1992. While reviewing the standard the committee felt to revise this standard keeping in view the latest developments in the tin production and refining process and also to modify the grades in the standard which have international acceptance and traded on various commodity exchanges.
3
In the present revision, the scope of the standard has been modified to cover the refined tin produced from either primary or secondary source or a combination of both, in line with the international practices. The requirements of primary tin and refined secondary tin were previously covered in separate standards IS 26 and IS 4280 respectively. Hence, the current revision of IS 26 supersedes the IS 4280 and IS 4280.
4
Hence, the current revision of IS 26 supersedes the IS 4280 and IS 4280. In addition, the following major modifications current have been made in this current revision:
a) The scope of the standard has been modified to cover the refined tin produced from either ore or secondary tin bearing materials like scrap etc, as per the prevailing practices in the international standards.
b) Amendment No.1 issued to the previous version of the standard has been incorporated;
c) Clause 2 on references has been modified ;
d) A new clause 3 on Terminology has been added;
e) Clause 4 on Classification and Grades has been modified and 4 new grades have been included namely Sn99.90, Sn99.93, Sn99.95 and Sn99.99 and the designation of the grades have been done as per their minimum tin content ;
f) Clause 6 on manufacture has been modified which does not restrict the use of secondary tin bearing materials;
g) Clause 7 on chemical composition has been modified to include the requirements chemical compos
5
h) A new clause 9 on shape and mass has been incorporated;
i) Clause 10 on sampling has been modified;
j) A new clause 13 on packaging has been added; and
k) A new clause 14.2 on marking of bundles has been added.