IS 4505:2015 pertains to Sodium formaldehyde sulphoxylate, commonly referred to as sodium sulphoxylate formaldehyde. This standard outlines the specifications, sampling procedures, and testing methodologies for sodium formaldehyde sulphoxylate dehydrate.

Sodium formaldehyde sulphoxylate, an essential sodium salt derived from sulphoxylic acid formaldehyde, is a product of the reaction between sodium hydrosulphite and formaldehyde. This compound is synthesized by combining sulfur dioxide with zinc dust in an aqueous suspension, resulting in a zinc hydrosulphite solution. Formaldehyde and additional zinc dust are introduced into this solution to create basic zinc formaldehyde sulphoxylate. The subsequent decomposition with caustic soda yields sodium formaldehyde sulphoxylate along with insoluble zinc hydroxide.

The sodium formaldehyde sulphoxylate should be present in the form of small white lumps or granules, exhibiting solubility in water at ambient temperature to yield a clear solution with a concentration of up to 50%. Notably, this material displays hygroscopic properties. Compliance with the standard's specifications is ensured through testing as per the prescribed methods.

TESTS

The subsequent test must be conducted for Sodium Formaldehyde sulphoxylate.

• Description

• Sodium formaldehyde sulphoxylate dehydrate

• Sodium formaldehyde bisulphate

• Sodium sulphite %

• pH

• Iron %

• Lead %

• Copper %

• Zinc %

PACKING AND MARKING

Packing, storage, and marking procedures must adhere to IS 4505:2015 standards. The material should be packaged in airtight black plate containers, each capable of holding 50 kg, equipped with a polyethylene liner, ensuring cleanliness and dryness. Storage should be in a cool, dry location, away from acidic conditions. Containers must be tightly sealed and appropriately labeled with details outlined in the standard.

Each container of Sodium Formaldehyde Sulphoxylate must bear the Standard Mark (ISI Mark), either directly marked or printed on the label, indicating compliance with the specification requirements. To utilize the standard mark (ISI Mark), manufacturers are required to obtain a BIS license from the Bureau of Indian Standards. This license is granted following a thorough evaluation of manufacturing infrastructure, quality control measures, testing capabilities, and production processes.

PROCESS FOR BIS ISI MARK CERTIFICATION