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Formamidine Sulphinic Acid
- Product Details
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Formamidine Sulphinic Acid
Formamidine Sulphinic Acid (FAS), also called Thiourea Dioxide, is a chlorine-free reducing bleach used in papermaking to enhance brightness, especially for mechanical (TMP, CTMP) and recycled pulp. Unlike oxidative agents (e.g., hydrogen peroxide), FAS works by reducing chromophores, gently removing color without damaging fibers. It operates effectively in neutral to slightly alkaline conditions (pH 6–9) and is often used in the final bleaching stage for deinked recycled pulp or high-yield mechanical pulps.
Technical Parameters
Formula (nh 2) 2 cso 2, n2h4cso2, ch4n2so2, ch4n2o2s Appearance white crystal powder Molecular weight 108.12 Melting point 126℃ Cas no. 1758-73-2 or 4189-44-0 (cas registry number or cas number, cas rn, cas #), also known as cas accession number, is the only digital identification code of a substance. H.s.no. 2930.90.90.90 (harmonized system code, the customs code of the goods) Unnon 341 (United Nations dangerous goods number) Ec# 217-157-8 pH 4（1%solution） Hazard level 4.2 Solution point 30 g/l (20℃) Product Features
(1) This product is a white powder crystal, the melting point of 126 degrees of decomposition, the aqueous solution is weakly acidic, is a compound of neither oxidation nor reduction.
(2) This product is stable in acid solution, but it is easy to decompose under alkaline conditions, generating a strong reducing sulfonic acid, so that this product can control the reducing effect.
(3) Compared with the insurance powder, this product has a high reduction potential, and the decline speed of the reduction potential is slow, only 1 / 5 of the reduced reduction potential of the insurance powder.
(4) This product has good safety performance, and has no pollution during production and use.Application Area
★Printing and dyeing industry used as a reducing agent, cotton, wool, chemical fiber bleaching reductive agent and sulfide dye also
Raw agent, disperse dye printing, textile peeling, reprocessing or floating color and other places can be used.
★ Used for paper pulp and bleaching in the paper industry.
★ The latex agent in the camera industry can make the phase paper exposure part show high stability.
★ Chemical fiber modified catalyst, can make the modified fiber is not yellow.
★ Antioxidants used in organic synthesis.
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