jER™ Epoxy

Mitsubishi Chemical Group Corporation Brand

jER™ is an epoxy resin brand with the longest history in Japan. Based on decades of research and accumulated technology, we are offering a wide range of epoxy resin grades with characteristic properties, such as low chlorine, low viscosity, transparency, flexibility, photo-curability, high molecular weight type, and specialized molecular structure type, to meet diverse needs of our customers.   *jER™ is provided by Mitsubishi Chemical Corporation, a member of the Mitsubishi Chemical Group
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Knowde Brand Summary


Plastics & Elastomers Functions

Features & Benefits

Labeling Claims

Applications & Uses

Adhesive & Sealant Type
Plastics & Elastomers End Uses

Knowde Brand Highlights


Definition: Compounds having multiple epoxy groups


When an epoxy resin is allowed to react with various curing agents, an infusible, insoluble, three-dimensional, hardened material is formed. The features listed below indicate how this high-performance, multipurpose resin can be used for a wide variety of applications.

  • There is tremendous freedom to adapt the material properties to the specific application requirements by adding various modifying agents (fillers, flexibility agents, diluents.)
  • Curing shrinkage is small.  Dimensional stability is excellent.
  • Excellent adhesion to metal, porcelain, concrete, etc.
  • High mechanically strength.
  • Excellent as an electrical insulator.
  • Excellent flexibility.
  • Excellent heat resistance.
  • Excellent wear and abrasion resistance.
  • Excellent chemical resistance, and moisture (water) resistance.
Typical Reactions

<Reaction with Representative Hardeners>

<Self Polymerization>

Selection of Hardeners

Appropriate choice of Hardener for a desired curing temperature

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

Types of Epoxy Resins

In addition to the basic bisphenol A resin mentioned above, other specialized resins are manufactured and sold to give the cured material specific property enhancements.

Following are the main specialized resins

  • Bisphenol F epoxy resin: Low viscosity makes it excellent to work with.
  • Multifunctional epoxy resin:  Cured material has outstanding thermal and chemical resistance.
  • Flexible epoxy resin:  The cured material's crack-resistance is improved.
  • High molecular weight epoxy resin (phenoxy resin): The cured coating has excellent machinery property.
  • Biphenyl epoxy resin:  The cured material has excellent heat resistance and low stress.

Either alone or in combination with bisphenol A epoxy resin, these special resins can give specific features to the cured product to satisfy application requirements.

  • Paints and coatings
  • Electrical insulation materials
  • Composite materials
  • Civil-engineering and construction materials
  • Adhesives
  • Tools
  • Other applications
Handling Precautions

A Japanese Ministry of Health, Labor, and Welfare toxicity study concluded that bisphenol A liquid epoxy resin and bisphenol F liquid epoxy resin are mutagenic. Therefore, when handling, it is necessary to follow the guidelines provided by the Ministry. In addition, as substances that can cause allergic dermatitis, official handling guidelines have been established by the Japanese Labor Standards Director and the Ministry of Health, Labor and Welfare. Similarly, precautions are needed in handling the curing agent. Especially amine-type curing agents can cause allergy-like dermatitis in people. In order to avoid direct contact, please use protective cream, gloves, goggles, and apron.  Avoid inhalation of vapor and particulates by working in a well-ventilated area and working upwind of the material.

In the event of skin contact, avoid use of solvents, wipe the affected area with a dry cloth, wash thoroughly with soap and water, and then apply hand cream.

In the event of eye contact, flush eyes with water for more than 15 minutes, and then seek medical attention.

Lineup / Specifications

Various requirements are addressed by changing the molecular weight and/or the basic structure of the epoxy resin.  A broad range of products are available in liquid, solid, or powder form, depending on the application.

  • Basic Liquid Type
  • Diluted Type
  • Basic Solid Type
  • Solution Type
  • Bis-F Liquid Type
  • Bis-F Solid Type
  • Phenoxy Type (Polymer Type Epoxy Resins)
  • Flame-retardant Type
  • Multifunction Type
  • Flexible Type
  • Special Function Type
  • Biphenyl Type
  • Emulsion Type (water-based epoxy resin)