Dasteck ChemicalsYantai Dasteck Chemicals Co., Ltd.
Very simple. Please send us the following five pieces of information: ① current application (polyester reduction clearing / stripping / machine cleaning / paper deinking / other); ② current hydrosulfite dosage, e.g. 3 g/L; ③ current NaOH dosage, e.g. 2 g/L; ④ processing conditions — temperature + time + liquor ratio; ⑤ annual consumption, e.g. 50 tonnes/year.
We will then provide: Thiourea Dioxide recommended starting dosage + comparative test recipe + sample + cost calculation template.
The trial logic is straightforward: current process (sodium hydrosulfite, current dosage, current processing conditions) versus the Thiourea Dioxide trial (optimized dosage, same fabric / same dye / same machine), then compare performance and chemical cost.
Evaluation parameters: reduction performance, ΔE, K/S, whiteness, fastness, fabric strength and chemical cost.
Buyer quick comparison — chemical name: sodium dithionite vs Thiourea Dioxide; formula: Na2S2O4 vs CH4N2O2S; both are used for reducing applications, polyester reduction clearing, dye stripping, machine cleaning and high-temperature alkaline reduction; dosage is process-dependent for both; aqueous stability is challenging for hydrosulfite and process-dependent for Thiourea Dioxide; storage and handling require careful control for hydrosulfite and appropriate SDS-based handling for Thiourea Dioxide; cost should be compared by $/tonne fabric rather than $/kg; the replacement strategy is lab → pilot → production optimization.
Important technical note: the comparison above is screening-level. It should not be interpreted as a guarantee that Thiourea Dioxide will outperform hydrosulfite in every textile or paper process. Actual performance should be confirmed with the customer's specific fabric, dye, equipment and recipe.
Send us your current sodium hydrosulfite recipe and annual consumption. We will calculate a preliminary Thiourea Dioxide dosage and estimated cost per tonne of fabric, then arrange a sample for testing.