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

Covestro Desmodur XP 2521 Isocyanate Curing Agent

Covestro Desmodur XP 2521 is a high-performance aliphatic polyisocyanate curing agent from the Desmodur XP series, designed for durable two-component polyurethane coatings requiring excellent weather resistance, gloss retention, and low-temperature reactivity. It offers balanced viscosity and pot life for industrial and automotive applications.
  • covestro desmodur xp 2521 isocyanate curing agent_3b15148c
  • covestro desmodur xp 2521 isocyanate curing agent_3b15148c

Features Of Covestro Desmodur XP 2521 Isocyanate Curing Agent

  1. Aliphatic polyisocyanate based on hexamethylene diisocyanate (HDI), offering excellent UV stability and color retention.

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

  3. Non-yellowing performance ideal for high-gloss and transparent coating systems requiring long-term clarity.

  4. Reactive NCO content optimized for balanced pot life and rapid film formation in ambient- and forced-dry applications.

  5. Compliant with REACH and meets stringent VOC regulations for industrial and architectural coatings.

Typical Applications Of Covestro Desmodur XP 2521 Isocyanate Curing Agent

  1. High-performance automotive clearcoats and basecoats requiring exceptional gloss, hardness, and weather resistance.

  2. Industrial maintenance coatings for machinery, rail vehicles, and agricultural equipment.

  3. Premium wood finishes for furniture, flooring, and cabinetry where clarity and scratch resistance are critical.

  4. Aerospace interior coatings demanding low VOC emissions and superior durability under thermal cycling.

Specifications Of Covestro Desmodur XP 2521 Isocyanate Curing Agent

Chemical TypeAliphatic HDI-based polyisocyanate
Product FormClear, colorless to pale yellow liquid
AppearanceHomogeneous liquid, free from sediment or haze
NCO Content (wt %)18.5 – 19.5
Viscosity at 25 °C (mPa·s)800 – 1,200
Density at 20 °C (g/cm³)1.14 – 1.16
Flash Point (PMCC, °C)135 – 145
Storage Stability (unopened, 25 °C)≥ 12 months


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