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jER™ YX4000

jER™ YX4000 is a biphenol-type solid epoxy resin with significantly low melt viscosity, low water absorption and a good balance between adhesiveness and rigidity against stress. It can be used for electrical and electronic applications. jERTM YX4000 is an adduct formed from the reaction of epichlorohydrin and tetramethylbiphenol FeaturesAbrasion, heat and water resistanceElectrical insulationWear resistanceProduct HighlightsSignificantly low melt viscosity (melting point: 108°C)Low chroline contentLow water absorption ApplicationsElectrical and electronic applications (EMC, solder resist, PCB)Potting and encapsulation materialsPowder coatings for ship bottomsAdhesivesComposites *jER™ is provided by Mitsubishi Chemical Corporation, a member of the Mitsubishi Chemical Group.

Brand: jER™ Epoxy (18 products)

Polymer Name: Epoxy Resins & Compounds

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

Chemical Family: Epoxy & Epoxy Derivatives

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

Enhanced TDS

Enhanced TDS

Knowde-enriched technical product data sheet

Identification & Functionality

Plastics & Elastomers Functions
Molecular Structure

Mitsubishi Chemical JER YX4000 Molecular Structure

Features & Benefits

  • Highly adhesive to metal, porcelain, concrete
  • Excellent insulation property
  • High heat resistance
  • High chemical resistance
  • High water resistance
Product Highlights
  • Solid type (Flake)
  • Significantly low melt viscosity (Melting point: 108°C)
  • Good balance between adhesiveness and rigidity against stress.
  • Low chroline content
  • Low water absorption 

Applications & Uses

Coating Type
Plastics & Elastomers End Uses
Usage & Application

jER™ YX4000 is a solid-type epoxy resin with well-balanced properties and is used for : 

  • Electrical and electronic applications(EMC, solder resist, PCB, etc.)
  • Composites, Potting & encapsulation materials.
  • Powder coating
  • Adhesives
  • Composites


Physical Form
Yellow solids
Physical Properties
ValueUnitsTest Method / Conditions
Density (at 25°C)1.15g/cm3Pycnometer
Harsh Hydrolyzable Chloride400ppmPotentiometric Titration
Melting Point108°CDifferential Scanning Calorimetry
Typical Properties
ValueUnitsTest Method / Conditions
Epoxy Equivalent Weight (WPE)180 - 192g/eqPotentiometric Titration
Total Chloride Content1000ppm
Properties Formulation

  Value Unit Method
jER™ YX4000 100 phr  
Phenol Novolac 56 phr  
Triphenylphosphine 1 phr  
Curing condition

120°C/2h + 175°C/6h

Cured State Properties
Tg 147 °C

Dynamic Mechanical Analysis

Elastic modulus@40°C 1.6 GPa

Dynamic Mechanical Analysis

Elastic modulus@250°C 18 MPa

Dynamic Mechanical Analysis

Coefficient of thermal elongation(α1) 70 ppm

Thermo Mechanical Analysis

Coefficient of thermal elongation(α2) 191 ppm

Thermo Mechanical Analysis

Td5 372 °C

Thermogravimetry-Differential, Thermal Analysis (Heating rate: 10°C/min, in air)

Technical Details & Test Data

Typical Reactions with Representative Hardeners

jER™ YX4000 - Typical Reactions With Representative Hardeners

Typical Reactions with Self Polymerization

jER™ YX4000 - Typical Reactions With Self Polymerization

Selection of Hardeners

Appropriate choice of Hardener for a desired curing temperature

jER™ YX4000 - Selection of Hardeners

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

 jER™ YX4000 - General Ways To Use Epoxy

Packaging & Availability

Packaging Type
Packaging Information
Paper bag with 20 kg net

Storage & Handling

Shelf Life
3 months
Storage and Handling

Carefully read the SDS before using, handling, transporting, storing or disposing. jER™ YX4000 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.