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
Chemical Family: Epoxy & Epoxy Derivatives
Polymer Name: Epoxy Resins & Compounds
Compatible Substrates & Surfaces: Glass, Fibers & Fabrics, Metal, Steel, Plastics, Aluminum, Ceramic, Concrete & Masonry
Product Resources
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Knowde Enhanced TDS
Identification & Functionality
Chemical Family
Polymer Name
CASE Ingredients Functions
Composite Materials Functions
Plastics & Elastomers Functions
Technologies
Molecular Structure
Structure : BisA:BisF=50:50
jER™ 4250 Features & Benefits
Materials Features
Product Highlights
- Solid type(pellet)
- Polymer epoxy resin
- Tough
- Addition of polymer epoxy resin gives toughness and film/sheet formability
Applications & Uses
Cure Method
Usage & Application
- Coating (PCM, CAN, and so on)
- Paint
- Additives to improve paintability/coatability
- Additives to give toughness/flexibility for fiber reinforced materials
- Modifier for thermoplastics (Hydrolysis resistance, adhesiveness, etc.)
- Printed Electronics (dry film, adhesive for triple-layer FPC, and adhesion promotor for FR4&FR5)
- Plastic processing (additives for improving film/sheet formability)
Properties
Color
Compatible Substrates & Surfaces
Appearance
Pale yellow solid
Physical 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 |
Typical Properties
| Value | Units | Test Method / Conditions | |
| Epoxy Equivalent Weight (WPE) | 7,500-8,900 | g/eq | Potentiometric Titration |
| MEK Content | max. 3 | % | GC |
| Molecular Weight | 59,000 | - | - |
Packaging & Availability
Packaging Type
Packaging Information
Paper bag with 25 kg net
Storage & Handling
Shelf Life
3 months
Storage and Handling
Carefully read the SDS before using, handling, transporting, storing or disposing. 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 (3) months from date of delivery.
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