The Bureau of Indian Standards (BIS) has released a draft First Revision of the Manganese Sulphate Monohydrate — Specification, proposing updates to the existing standard. Stakeholders can submit comments or suggestions until March 30, 2026.
Scope and Key Updates
Manganese sulphate monohydrate is widely used in industries such as animal feed, paints, varnishes, electroplating, textiles, ceramics, paper, and dry cell manufacturing. The original standard was published in 1983.
The revised draft updates the product specifications and introduces optional instrumental testing methods to determine the levels of iron, lead, arsenic, calcium, and chlorides. It also adds normative reference clauses and revises the packaging and marking requirements.
Grades and Specifications
The draft categorizes the product into two grades:
-
Grade 1 (Pure Grade): Final product obtained directly from the manufacturing process.
-
Grade 2 (Industrial Grade): By-product generated during manufacturing.
Packaging and Marking
The product must be packed in polyethylene laminated jute bags or other mutually agreed packaging materials. Each package must clearly display the material name and grade, manufacturer’s name and registered trademark, gross and net weight, packing date, and batch number.
The table below outlines the specification requirements for manganese sulphate monohydrate:
|
Characteristic |
Requirements |
|
|
Grade 1 |
Grade 2 |
|
|
Manganese sulphate (as MnSO4.H2O), % by mass
|
97.0 ～ 98.0 |
83.0 ～ 85.0 |
|
Manganese (as Mn), % by mass |
31.60 ～ 31.95 |
27.01 ～ 27.70 |
|
Insoluble matter, % by mass |
0.2 |
0.5 |
|
Chloride (as Cl), % by mass |
0.03 |
0.03 |
|
Magnesium and alkali metals (as SO4), % by mass |
0.6 |
- |
|
Calcium (as Ca), % by mass |
0.2 |
- |
|
Zinc (as Zn), % by mass |
0.05 |
0.05 |
|
Iron (as Fe), % by mass |
0.005 |
0.08 |
|
Heavy metals (as Pb), % by mass |
0.002 |
0.05 |
|
Arsenic (as as), % by mass |
0.0005 |
- |
|
Oxygen absorbed from permanganate (as O), % by mass |
0.0008 |
- |
|
Ammonium sulphate [as (NH4)2SO4], % by mass |
- |
15 |
