MX‑257 is a liquid epoxy masterbatch with nano core‑shell rubber (CSR) uniformly predispersed inside epoxy resin carrier. The pre‑dispersed rubber particles eliminate high‑energy grinding and complex dispersion procedures for formulators. This toughener greatly improves impact resistance, fracture toughness and peel strength of cured epoxy matrix, while maintaining acceptable thermal performance and modulus. MX‑257 is designed for formulating high‑strength structural adhesives and advanced fiber

Product Detail

Product Detail PageChemical IdentityMX‑257 is a ready‑to‑use predispersed CSR toughening masterbatch. Nano‑sized core‑shell rubber particles are homogenously suspended within the epoxy carrier resin. The core‑shell rubber is synthesized by emulsion polymerization with strictly controlled particle‑size distribution. There are no rubber agglomerates within the supplied liquid product, which allows direct blending into base epoxy resins without pre‑milling. It exhibits excellent compatibility with standard bisphenol‑A epoxy grades, and demonstrates good formulation adaptability with amine, dicyandiamide as well as anhydride curing agents. Supplied as viscous liquid, MX‑257 can be conveniently incorporated during epoxy compounding and adhesive preparation workflows.

Key PerformanceAfter epoxy cross‑linking and curing, the distributed nano CSR domains act as internal energy‑absorbing sites within the rigid thermoset network. When subjected to mechanical shock and external load, the rubber particles induce localized plastic deformation, dissipate fracture energy and effectively retard crack initiation and crack propagation. MX‑257 significantly elevates impact resistance and peel strength of structural adhesive bonds. For fiber‑reinforced composite laminates, it suppresses delamination risks under low‑velocity impact and improves durability against repeated thermal cycling. The glass‑transition temperature and heat‑resistance of cured epoxy do not experience a sharp drop upon addition of MX‑257. The masterbatch shows suitable viscosity for processing of prepreg, resin infusion and automatic adhesive dispensing in mass production.

ApplicationsMX‑257 is suitable for both one‑component and two‑component epoxy structural adhesives for dissimilar‑material bonding between metal and fiber‑reinforced composite substrates. It serves as critical toughening modifier for carbon‑fiber and glass‑fiber reinforced epoxy composite laminates. Typical finished products include lightweight transportation structural parts, industrial composite panels, machinery structural elements that need to withstand dynamic impact and alternating hot‑cold operating conditions. It matches multiple composite manufacturing processes including prepreg lay‑up, vacuum resin infusion and hand‑lay‑up lamination. This CSR masterbatch is also selected for high‑reliability structural bonding adhesives used in heavy‑duty mechanical assembly.

Storage & HandlingStore MX‑257 in tightly‑sealed original drums inside cool, dry and well‑ventilated warehouse, with recommended storage temperature ranging from 15‑25℃. Avoid prolonged storage under high ambient temperature, which will cause gradual viscosity rising. Low‑temperature storage may increase fluid viscosity; slow gentle warming is permitted prior to usage. Shield the product from direct sunlight. Once the drum is opened, reseal the container immediately to prevent moisture contamination. Sufficient local ventilation should be guaranteed during material transferring and formulation operations. Operators are required to wear chemical‑resistant gloves, safety goggles and protective garments to prevent direct skin and eye contact with liquid epoxy.

Why Choose SupplierWe provide stable‑quality alternative grade of MX‑257 CSR epoxy toughener for structural adhesive and advanced composite manufacturers. Complete TDS and MSDS documentation can be provided for export business. Both bulk drum shipments and small trial‑run packaging options are available. Our material supports overseas factories to develop high‑impact‑resistant epoxy structural adhesive and fiber‑reinforced composite formulations.

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Epoxy Toughener MX-257, CSR Predispersed System for Structural Adhesive Composite Impact Resistance

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.