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

Tosoh CORONATE 3521 Curing Agent

Tosoh CORONATE 3521 Curing Agent is a low-viscosity aliphatic polyisocyanate hardener from the CORONATE series, designed for high-performance two-component polyurethane coatings. It offers excellent weather resistance, fast curing at room temperature, and superior gloss retention—ideal for automotive refinishes and industrial topcoats requiring durability and clarity.
  • tosoh coronate 3521 curing agent_5aabc8d2
  • tosoh coronate 3521 curing agent_5aabc8d2

Features Of Tosoh CORONATE 3521 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 homogeneous mixing with hydroxyl-functional resins.

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

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

  5. Compliant with major global VOC regulations, supporting sustainable coating system design.

Typical Applications Of Tosoh CORONATE 3521 Curing Agent

  1. Automotive OEM clearcoats and topcoats requiring long-term color and gloss stability.

  2. High-performance industrial maintenance coatings for infrastructure and heavy equipment.

  3. Premium architectural coatings for façades and metal cladding systems exposed to harsh environments.

  4. Plastic coatings for exterior automotive trim and consumer electronics housings.

  5. Wood finishing systems demanding rapid through-cure and superior surface durability.

Specifications Of Tosoh CORONATE 3521 Curing Agent

Chemical TypeAliphatic polyisocyanate (hexamethylene diisocyanate trimer)
Product FormLiquid
AppearanceClear, pale yellow to colorless liquid
NCO Content (wt%)Approx. 17.0–17.8%
Viscosity at 25°C (mPa·s)Approx. 800–1,200
Density at 25°C (g/cm³)Approx. 1.19–1.21
Solvent ContentNone (solvent-free)
Primary Applications2K polyurethane coatings for automotive, industrial, and architectural use


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