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A look inside our Guangdong plant — dedicated polyisocyanate reactors, in-line NCO and viscosity checks, and the QC that keeps every batch stable.
A full range of TDI, HDI and IPDI based hardeners for solvent-borne, waterborne and high-solids coating systems.
Polyurethane floor coating solutions supported by Dongsen polyisocyanate hardeners and moisture-curing prepolymers for industrial flooring formulations.Product directions include floor sealer and primer, self-leveling, high-build and waterborne 2K polyurethane coating systems.
Waterbased floor coating materials for EPDM courts, tracks and silicone PU flooring systems.Explore 1K and 2K water-based resin options for hardness, water and chemical resistance, and practical coating performance.
Automotive OEM & Refinish visual: Real spray painting scene with vehicle panel/booth, showcasing HDI-based polyisocyanate hardener applications. No lab or bottle shots.
Dongsen provides polyisocyanate hardeners and crosslinkers for interior wood and furniture coating formulations, supporting resin compatibility, finish requirements and professional surface appearance.
Explore Dongsen’s selected polyisocyanate hardener products for coating and adhesive formulation projects. Request TDS, samples, or technical recommendation based on your application.
HDX-175MPX is an HDI biuret polyisocyanate hardener for 2K automotive refinish clearcoat and primer formulations. Dongsen also has a real-world outdoor steel coating application reference for this grade, subject to formulation-specific validation.
DL-75 is a TDI adduct polyisocyanate hardener for indoor 2K polyurethane wood and furniture coating formulations, with 75±2% solids, NCO 13.0±0.5% and free TDI ≤0.5%.
HDX-100 is a 100% solids aliphatic HDI trimer polyisocyanate hardener for 2K PU systems, with a verified hardness and high-crosslink-density direction and confirmed automotive refinish formulation use.
Every hardener produced under ISO 9001 quality and ISO 14001 environmental management systems.
Technical reading that helps formulators match a hardener to their resin,process and cure — then points to the grade that fits.
Updated: October 15, 2026 A blocked isocyanate crosslinker is selected by matching its activation behavior to the resin functionality and the actual substrate temperature…
Updated: 2026 Waterborne Paints: Pros, Cons, and How to Pick the Right Crosslinker Waterborne paints use water instead of organic solvent as the carrier,…
Updated: 2026 Polyisocyanate Curing Agents: 3 Types, Selection Guide and Dongsen Grades Quick Answer: The three common polyurethane curing agent routes covered here are…
The questions formulators ask us most — on chemistry, selection, documentation and compliance.
The right PU hardener depends on your resin type, target performance, application method and curing conditions. Share your resin system and end-use requirements, and Dongsen can recommend a suitable grade for evaluation.
TDI-based PU hardeners are commonly used where cost-performance balance is important, while HDI-based PU hardeners are generally selected for applications requiring better light and weather resistance. Final selection depends on the complete formulation and end-use requirements.
The suitable grade depends on your resin system, drying requirements, hardness, flexibility and appearance targets. Dongsen can recommend PU hardener grades based on your formulation and application conditions.
Yes. Dongsen supplies PU hardeners for selected automotive, industrial and other polyurethane coating systems. Grade selection should be based on the resin system, curing conditions and required performance.
Yes. Samples can be arranged for formulation evaluation and performance testing, subject to grade availability and application review. Please provide your resin type and target application.
Yes. Available technical and safety documents can be provided according to the selected PU hardener grade and current document status. COA can be supplied for applicable commercial batches.
Please provide the required grade, estimated quantity, destination country and application. If you have not selected a grade yet, send your resin system and performance requirements first.
Yes. Dongsen can support grade selection based on resin type, application, curing conditions and target performance. For more accurate recommendations, provide as much formulation and process information as possible.
