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

Kaneka B-625 Toughener

Kaneka B-625 Toughener is a high-performance liquid reactive diluent and flexibilizer from Kaneka’s B-Series, designed to enhance impact resistance and reduce brittleness in epoxy resins without compromising thermal stability or glass transition temperature. Widely used in aerospace composites, electrical encapsulants, and structural adhesives for superior toughness and processability.
  • kaneka b 625 toughener_6cccc4b0
  • kaneka b 625 toughener_6cccc4b0

Features Of Kaneka B-625 Toughener

  1. Reactive liquid epoxy resin modifier for enhanced fracture toughness without sacrificing glass transition temperature (Tg).

  2. Low viscosity enables excellent processability and homogeneous dispersion in epoxy formulations.

  3. Improves impact resistance and delamination resistance in cured thermoset composites.

  4. Compatible with standard amine and anhydride curing agents used in structural adhesives and prepregs.

  5. Halogen-free formulation supporting environmentally compliant composite manufacturing.

Typical Applications Of Kaneka B-625 Toughener

  1. Aerospace-grade carbon fiber reinforced polymer (CFRP) prepregs and laminates.

  2. High-performance structural adhesives for automotive lightweighting and EV battery modules.

  3. Wind turbine blade matrix resins requiring fatigue resistance and crack propagation suppression.

  4. Electronics encapsulants and underfills demanding thermal cycling reliability and mechanical resilience.

Specifications Of Kaneka B-625 Toughener

Chemical TypeReactive liquid carboxyl-terminated polybutadiene (CTPB)-based epoxy toughener
Product FormClear, low-viscosity amber liquid
AppearanceHomogeneous, slightly viscous liquid at 25°C
Primary ApplicationsEpoxy resin toughening for aerospace, automotive, wind energy, and electronics
Key FeaturesReactive functionality, Tg-neutral toughening, halogen-free
BenefitsImproved interlaminar shear strength (ILSS), reduced microcracking, enhanced process stability
Storage ConditionsStore in sealed containers at 10–30°C; protect from moisture and direct sunlight


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