Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

Tosoh CORONATE 2257 Curing Agent

Tosoh CORONATE 2257 is a high-performance aliphatic polyisocyanate curing agent from the CORONATE series, designed for premium two-component polyurethane coatings. It offers excellent weather resistance, low viscosity, fast cure at room temperature, and superior gloss retention—ideal for automotive refinish, industrial maintenance, and high-end architectural applications requiring durability and clarity.
  • tosoh coronate 2257 curing agent_8d33980d
  • tosoh coronate 2257 curing agent_8d33980d

Features Of Tosoh CORONATE 2257 Curing Agent

  1. Aliphatic polyisocyanate-based curing agent offering excellent weather resistance and UV stability.

  2. Low-viscosity liquid formulation enabling easy handling, precise metering, and compatibility with standard spray equipment.

  3. Fast-reacting at ambient and elevated temperatures, supporting efficient production cycles in industrial coating lines.

  4. Provides superior gloss retention, hardness development, and chemical resistance in final cured films.

  5. Compliant with major global VOC regulations for industrial maintenance and automotive refinish applications.

Typical Applications Of Tosoh CORONATE 2257 Curing Agent

  1. Automotive OEM and refinish clearcoats requiring high durability and long-term color stability.

  2. Industrial maintenance coatings for steel structures, bridges, and offshore platforms.

  3. High-performance plastic coatings for exterior automotive parts and consumer electronics housings.

  4. Polyurethane topcoats used in railcar and heavy-duty equipment finishing.

  5. Two-component (2K) solventborne and high-solids coating systems for demanding architectural metal applications.

Specifications Of Tosoh CORONATE 2257 Curing Agent

Chemical TypeAliphatic polyisocyanate (hexamethylene diisocyanate trimer)
Product FormClear, low-viscosity liquid
AppearanceColorless to pale yellow, transparent liquid
NCO Content (wt%)15.8–16.4%
Viscosity at 25°C (mPa·s)1,200–1,800
Density at 25°C (g/cm³)1.20–1.24
Solvent ContentAcetate-based (e.g., ethyl acetate, propyl acetate)
Primary Applications2K polyurethane clearcoats and topcoats


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