jER™ YX7105 is a liquid-type epoxy resin with toughness, flexibility, and high stretchability. It is used as an impact modifier for semiconductor, printed electronics and wearable devices to avoid bending and warpage. jER™ YX7105 is an adduct formed from the reaction of epichlorohydrin and an aliphatic and aromatic polyol.FeaturesExcellent adhesionGood toughnessGood mechanical, impact and crack resistanceExcellent elasticity and flexibilityApplicationsPrinted electronics (resist ink, build-up wire board, flexible printed wire board, metal core printed circuit board)Semiconductor manufacturing (liquid mold compound, underfill, sidefill, diebonding, ACF, NCF, ACP, NCP)Base film and sheet for wearable devicesCoatingsAdhesives *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, 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

Mitsubishi Chemical jER YX7105 Molecular Structure

Features & Benefits

Product Highlights
  • Liquid type (easy to handle)
  • Flexibility, stretchability
  • Tough, High resistant to mechanical pressure (thermal decomposition, bending/warpage)
  • Strong adhesion
  • Highly adhesive to metal, porcelain, concrete
  • Excellent insulation property
  • High heat resistance
  • High chemical resistance
  • High water resistance

Applications & Uses

Plastics & Elastomers End Uses
Usage & Application
  • Coating
  • Adhesives
  • Additives (Stress relaxer, Impact modifier)
  • Base film and sheet for wearable devices,
  • Printed Electronics (Resist Ink, Build-up wire board, Flexible printed wire board, Metal core printed circuit board)
  • Semiconductor (liquid mold compound, underfill, sidefill, diebonding, ACF, NCF, ACP, NCP)

jERTM YX7105 is a liquid-type epoxy resin with flexible properties that increases the impact resistance of e.g. coatings, adhesives, composites and potting & encapsulation materials. 


Physical Form
Colorless liquid
Physical Properties
ValueUnitsTest Method / Conditions
Density (25°C)1.2Kg/m3Volumetric
Viscosity (at 50°C)65PBrookfield Viscometer
Typical Properties
ValueUnitsTest Method / Conditions
Epoxy Equivalent Weight (WPE)440-500g/eqPotentiometric Titration
SAP Chloridemax. 100ppmPotentiometric Titration
Total Chloride Content500ppm
Properties Formulation

  Value Unit Method
jER™ YX7105 100 phr  
Bisphenol A Novolac 25 phr  
2-Ethyl-4-methylimidazole 0.05 phr  
Curing condition

170°C/1hr + 180°C/1hr

Cured State Properties
Tg 31 °C

Thermomechanical Analysis

Td5 336 °C

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

Tensile Modulus 63 MPa Autograph
Tensile Strength 8.8 MPa Autograph
Tensile Elongation 153 MPa Autograph

Technical Details & Test Data

Typical Reactions with Representative Hardeners

jER™ YX7105 - Typical Reactions With Representative Hardeners

Typical Reactions with Self Polymerization

jER™ YX7105 - Typical Reactions With Self Polymerization

Selection of Hardeners

Appropriate choice of Hardener for a desired curing temperature

jER™ YX7105 - Selection of Hardeners

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

 jER™ YX7105 - General Ways To Use Epoxy

Packaging & Availability

Packaging Type
Packaging Information
Metal can with 18 kg net

Storage & Handling

Shelf Life
3 months
Storage and Handling

Carefully read the SDS before using, handling, transporting, storing or disposing. jER™ YX7105 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.