Import Dimethyl-5-Sulfoisophthalate Sodium Salt — Buy in Bulk from Supplier in China

Dimethyl-5-sulfoisophthalate sodium salt, also known as SIPM or DMSIP, is a white powdered chemical compound with the CAS number 3965-55-7 and molecular formula C10H9O7SNa. It has a molecular weight of 296.24 g/mol and is supplied in two grades, A and B, both appearing as white powders. Grade A limits acid value to 0.4 mg KOH/g, sulphate to 100 ppm, and iron to 4 ppm, while Grade B allows up to 0.6 mg KOH/g acid value and 300 ppm sulphate. Both grades maintain water content below 0.4% and absorbance under 0.05.

The compound is typically used as a third monomer in cation-modified polyester (CDPET) to enhance dyeability with cationic dyes. Its sulfo group improves affinity for dyestuffs, resulting in brighter, deeper shades and a wool-like hand feel in finished fibres. This makes it valuable in textile applications requiring blendability with fleece. It is also used in water-dispersible resin systems for coatings and adhesives, where its solubility and stability support consistent formulation performance. Industry standards for purity and impurity limits align with typical requirements for polymer-grade intermediates.

Buyers in the textile and polymer industries source this material for modifying polyester chips and formulating specialty resins. It is packed in 25 kg three-in-one kraft bags with inner plastic lining or 500 kg flexible container bags. Trade terms are typically FOB or CIF from Chinese ports, with lead times depending on order volume and packaging preference. Buyers should confirm batch-specific test reports for acid value, sulphate, and iron content prior to shipment.

Weifamng World Chemical Co., Ltd is located at No.661 Tongting Street, Hanting, Weifang, China. The company is classified as an imported supplier with harbor trust tier status, indicating verified export compliance and logistics readiness. Its profile does not state years in operation, production capacity, or client names, and response metrics are not available. The listing confirms active export activity through documented product specifications and packaging standards.

The supplier does not claim certifications such as ISO, SGS, or REACH, nor does it provide information on laboratory testing protocols or quality control systems beyond the published analytical limits. Buyers should treat this as a direct manufacturer or trader with documented product output, but must independently verify regulatory compliance and production consistency before placing bulk orders.