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

Covestro HDI Blocked Curing Agent Desmodur BL 4265 SN

Covestro Desmodur BL 4265 SN is a blocked HDI-based curing agent from the Desmodur BL series, offering low-VOC, one-component reactivity with excellent storage stability and smooth film formation for high-performance coatings.
  • covestro hdi blocked curing agent desmodur bl 4265 sn_42df8a16
  • covestro hdi blocked curing agent desmodur bl 4265 sn_42df8a16

Features Of Covestro HDI Blocked Curing Agent Desmodur BL 4265 SN

  1. Thermal deblocking at 130–160 °C enables low-VOC, one-component polyurethane formulations.

  2. Excellent storage stability at ambient temperature with no premature reaction during shelf life.

  3. Provides high crosslink density and superior chemical resistance in cured films.

  4. Compatible with hydroxyl-functional acrylics, polyesters, and alkyds for versatile coating systems.

  5. Low free HDI monomer content (< 0.1 wt%) meets stringent occupational health and regulatory requirements.

Typical Applications Of Covestro HDI Blocked Curing Agent Desmodur BL 4265 SN

  1. Automotive OEM clearcoats and basecoats requiring high gloss and durability.

  2. Industrial maintenance coatings for metal substrates exposed to harsh environments.

  3. Wood finishing systems demanding low-temperature cure and excellent film hardness.

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

Specifications Of Covestro HDI Blocked Curing Agent Desmodur BL 4265 SN

Chemical TypeHDI-based blocked isocyanate (ε-caprolactam blocked)
Product FormLiquid
AppearanceClear, pale yellow liquid
Primary ApplicationsOne-component thermosetting coatings
Key FeaturesThermally activated, low-free-isocyanate, ambient-stable
BenefitsEasy handling, extended pot life, reduced VOC, high crosslink efficiency
Recommended Cure Temperature130–160 °C (depending on substrate and film thickness)
Storage ConditionsStore below 30 °C in tightly sealed containers; protect from moisture


Get in Touch with ERICW
Let competitive chemical materials go global.

Your Name *

Your Email *

Your Phone

Country

Your Message *