Import Dimethylolpropionic Acid — Buy in Bulk from Supplier in China

Dimethylolpropionic Acid (DMPA), CAS 4767-03-7, is a white crystalline solid with a molecular formula of C5H10O4 and a molecular weight of 134.13 g/mol. It has a melting point range of 185 to 190°C, a density of approximately 0.84 g/cm³, and is odorless with free-flowing crystalline properties. The product meets assay specifications of at least 99% purity, with moisture content not exceeding 0.2%, ash content under 0.03%, and residual aldehyde below 0.01%. Hydroxyl value ranges between 810 and 860 mgKOH/g, indicating high reactivity for polyurethane synthesis.

The material is available in two grades: DMPA-1 with 90% of particles sized between 0.250 and 0.425 mm, and DMPA-2 with no more than 30% in that range and at least 50% in the finer 0.150 to 0.250 mm fraction. Typical industrial purity standards for DMPA require low levels of metallic impurities: iron under 5 ppm, sodium under 30 ppm, potassium under 10 ppm, phosphorus as phosphate under 10 ppm, silicon as silicate under 1 ppm, and sulfate ion under 10 ppm. These limits align with standard requirements for waterborne polyurethane precursors in coating and adhesive manufacturing.

DMPA is primarily used as a hydrophilic monomer in waterborne polyurethane dispersions, water-soluble alkyd resins, polyester systems, and powder coatings. It is also applied in leather finishing agents and high-performance adhesives. Buyers include manufacturers of industrial coatings, automotive finishes, and specialty polymers. Packaging is in 25 kg paper-plastic laminated bags with cardboard outer layers, stored in sealed conditions away from moisture. The product is shipped in bulk, with custom packaging available upon request.

Hangzhoutonghe Chemical Industry Technology Development Co., Ltd is based in Hangzhou, Zhejiang Province, China, with a registered address at Room 673, No.477, Wensan Road. The company is verified as an importer and exporter of specialty chemicals under the harbor trust tier. The listing confirms active participation in international trade but does not state company age, employee count, revenue, or client names. Response metrics are not available, and no certifications are referenced.

The supplier focuses on the production and distribution of chemical intermediates, with DMPA listed as a core product. There is no indication of manufacturing capacity, R&D facilities, or third-party audits. The absence of response rate data suggests limited direct buyer communication channels. Buyers should treat this as a sourcing channel for technical-grade DMPA with verified product specifications but unconfirmed operational scale.