Yantai Dasteck Chemicals Co., Ltd.
Yantai Dasteck Chemicals Co., Ltd.: “Manufacturer of Thiourea Dioxide (TDO, CAS 1758-73-2) for textile reduction, paper-grade Formamidine Sulfinic Acid (FAS) for pulp and paper, and Thiourea and Dicyandiamide for specialty use. Producing TDO since 1983, and a participating drafting unit of the Chinese industry standard for thiourea dioxide, HG/T 3258-2010.”
Why Is FAS Used for Deinked Pulp (DIP) Bleaching?
“Deinked pulp brightness is often limited by residual chromophores rather than lignin. FAS provides reductive bleaching under alkaline conditions. Fibre yield loss is generally small when process conditions are controlled. Actual brightness gain depends on furnish, ink system, consistency, pH, temperature, reaction time, metal ions and FAS dosage.”
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