jER™ 4250 is a hybrid bisphenol A/bisphenol F-type epoxy resin that is more flexible than conventional polymer-type epoxy resins. It can be used as an additive to add toughness, insulating and vapor barrier properties and resistance to heat, water and chemicals to a variety of applications. FeaturesPolymer-type epoxy resin with epoxy functional groups at the both endsHigh molecular weightHigh softening points Good adhesionApplicationsPCM, CAN and other coatingsPaintThermoplastics Printed electronics Plastic processing *jER™ is provided by Mitsubishi Chemical Corporation, a member of the Mitsubishi Chemical Group.

Polymer Name: Epoxy Resins & Compounds

Functions: Adhesion Promoter, Binder & Resin, Coupling Agent, Impact Modifier, Plasticizer, Resin, Resins, Binders & Matrix Materials

Chemical Family: Epoxy & Epoxy Derivatives

Compatible Substrates & Surfaces: Aluminum, Ceramic, Concrete, Fibers & Fabrics, Glass, Metal, Plastics, Steel

Knowde Enhanced TDS

Identification & Functionality

Plastics & Elastomers Functions
Molecular Structure

Structure : BisA:BisF=50:50

Mitsubishi Chemical jER 4250 Molecular Structure

Features & Benefits

  • Highly adhesive to metal, porcelain, concrete
  • Excellent insulation property
  • High heat resistance
  • High chemical resistance
  • High water resistance

Applications & Uses

Cure Method
Applications & Use

jER™ 4250 is used for coatings (PCM, CAN, and so on) , adhesives.


Physical Form
Pale yellow solid
Physical Properties
ValueUnitsTest Method / Conditions
Glass Transition Temperature70°CDifferential Scanning Calorimetry
Viscosity (at 25°C, 40% Solid Butyl Carbitol)max. Z8+Gardner-Holdt
Typical Properties
ValueUnitsTest Method / Conditions
Epoxy Equivalent Weight (WPE)*7500 - 8900g/eqPotentiometric Titration
MEK Content* max. 3%GC
Molecular Weight59,000

*based on Mitsubishi Chemical test methods.

Technical Details & Test Data

Typical Reactions with Representative Hardeners

jER™ 4250 - Typical Reactions With Representative Hardeners

Typical Reactions with Self Polymerization

jER™ 4250 - Typical Reactions With Self Polymerization

Selection of Hardeners

Appropriate choice of Hardener for a desired curing temperature

jER™ 4250 - Selection of Hardeners

General Ways to Use Epoxy
  • Epoxy resin forms 3D crosslinked network structure
  • Abundant choices of Epoxy/Hardener combination

 jER™ 4250 - General Ways To Use Epoxy

Packaging & Availability

Packaging Type
Packaging Information
Paper bag with 25 kg net

Storage & Handling

Shelf Life
3 months
Storage and Handling

jER™ 4250 Should be stored in tightly closed containers under exclusion of humidity at gentle temperatures. Avoid exposure to direct sunlight. Under these storage conditions the product has a minimum shelf life of three months from date of delivery.