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.
Features
- Polymer-type epoxy resin with epoxy functional groups at the both ends
- High molecular weight
- High softening points
- Good adhesion
Applications
- PCM, CAN and other coatings
- Paint
- Thermoplastics
- Printed electronics
- Plastic processing
*jER™ is provided by Mitsubishi Chemical Corporation, a member of the Mitsubishi Chemical Group.
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Identification & Functionality
Structure : BisA:BisF=50:50
jER™ 4250 Features & Benefits
- Highly adhesive to metal, porcelain, concrete
- Excellent insulation property
- High heat resistance
- High chemical resistance
- High water resistance
Applications & Uses
jER™ 4250 is used for coatings (PCM, CAN, and so on) , adhesives.
Properties
| Value | Units | Test Method / Conditions | |
| Glass Transition Temperature | 70 | °C | Differential Scanning Calorimetry |
| Viscosity (at 25°C, 40% Solid Butyl Carbitol) | max. Z8+ | - | Gardner-Holdt |
| Value | Units | Test Method / Conditions | |
| Epoxy Equivalent Weight (WPE)* | 7500 - 8900 | g/eq | Potentiometric Titration |
| MEK Content* | max. 3 | % | GC |
| Molecular Weight | 59,000 | - | - |
*based on Mitsubishi Chemical test methods.
Technical Details & Test Data
Appropriate choice of Hardener for a desired curing temperature
- Epoxy resin forms 3D crosslinked network structure
- Abundant choices of Epoxy/Hardener combination
Packaging & Availability
Storage & 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.