jER™ 1256 is a solid epoxy resin produced from Bisphenol A epoxy resin. It is a polymer-type epoxy resin with epoxy functional group at the both ends. It can be used to add toughness, insulating and vapor barrier properties, and resistance to heat, water and chemicals in a variety of applications. FeaturesHigh molecular weightHigh softening pointsGood film formerHydrolysis resistanceFlexibilityStrong adhesionApplicationsPCM, CAN, and other coatingsPaintsFiber-reinforced materialsThermoplasticsPrinted electronicsPlastic 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: Bisphenol A Type Epoxy, 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-type

Mitsubishi Chemical jER 1256 Molecular Structure

Features & Benefits

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

Applications & Uses

Applications & Use

jER™ 1256 is used for coatings (PCM, CAN, and so on) , adhesives.


Physical Form
Pale yellow solid
Physical Properties
ValueUnitsTest Method / Conditions
Viscosity (at 25°C, 40% Solid Butyl Carbitol)max. Z10Gardner-Holdt*
Glass Transition Temperature95°CDifferential Scanning Calorimetry*
Typical Properties
ValueUnitsTest Method / Conditions
Epoxy Equivalent Weight (WPE)7500 - 8500g/eqPotentiometric Titration*
Molecular Weight51,000

* Based on Mitsubishi Chemical test methods.

Technical Details & Test Data

Typical Reactions with Representative Hardeners

jER™ 1256 - Typical Reactions With Representative Hardeners

Typical Reactions with Self Polymerization

jER™ 1256 - Typical Reactions With Self Polymerization

Selection of Hardeners

Appropriate choice of Hardener for a desired curing temperature

jER™ 1256 - Selection of Hardeners

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

 jER™ 1256 - 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™ 1256 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.