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

Kaneka MX-257 Epoxy Resin Toughening Agent

Kaneka MX-257 is a high-performance epoxy resin toughening agent from Kaneka’s MX series, designed to enhance impact resistance and fracture toughness without compromising thermal stability or processability in advanced composites and structural adhesives.
  • kaneka mx 257 epoxy resin toughening agent_32f18a2f
  • kaneka mx 257 epoxy resin toughening agent_32f18a2f

Features Of Kaneka MX-257 Epoxy Resin Toughening Agent

  1. Reactive liquid modifier enabling significant improvement in fracture toughness without sacrificing glass transition temperature (Tg)

  2. Excellent compatibility with standard DGEBA-type epoxy resins and amine or anhydride curing agents

  3. Low viscosity formulation facilitates easy handling, metering, and homogeneous blending into epoxy systems

  4. Enables high-performance composites with enhanced impact resistance and crack propagation resistance

  5. No volatile organic compounds (VOCs) — supports low-emission and environmentally compliant formulations

Typical Applications Of Kaneka MX-257 Epoxy Resin Toughening Agent

  1. Aerospace structural adhesives and composite matrix resins

  2. High-reliability electronic encapsulants and underfills

  3. Wind turbine blade matrix resins requiring fatigue resistance

  4. Precision industrial tooling and casting compounds

  5. Automotive under-hood components and electric vehicle battery module adhesives

Specifications Of Kaneka MX-257 Epoxy Resin Toughening Agent

Chemical TypeReactive liquid carboxyl-terminated polybutadiene (CTPB)-based modifier
Product FormLiquid
AppearancePale yellow to light amber, clear, low-viscosity liquid
Primary ApplicationsEpoxy resin toughening for structural composites and adhesives
Key FeaturesReactive functionality, phase-separation controlled morphology, Tg-neutral toughening
BenefitsImproved impact strength, reduced microcracking, extended service life under cyclic loading
Storage ConditionsStore at 10–30°C in tightly sealed containers; protect from moisture and direct sunlight
Shelf Life12 months from date of manufacture when stored as recommended


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