Cationic UV-Curing Epoxy Oligomer
CAS Number: 25068-38-6
Cationic UV-Curing Epoxy Oligomer is an epoxy-functional resin designed for cationic photopolymerization initiated by diaryliodonium or triarylsulfonium salts. Unlike acrylate UV systems, cationic epoxy cure continues after UV exposure (dark cure), resulting in very low shrinkage, excellent adhesion to metals and glass, and outstanding chemical resistance. These systems are used in high-performance optical, electronic, and industrial UV adhesive applications requiring dimensional precision and chemical durability.
Technical Specifications
| color | ≤1 (Gardner) |
| viscosity | 500–5,000 mPa·s (25 °C) |
| appearance | Colorless to pale yellow liquid |
| waterContent | ≤0.05% |
| epoxyEquivalentWeight | 170–200 g/eq |
Applications
- Optical component bonding (low shrinkage)
- Electronics die-attach and underfill
- Industrial UV adhesives for metal bonding
- Conformal coatings for electronics
- Microelectronics and MEMS packaging
Key Features
- Very low cure shrinkage for dimensional accuracy
- Dark cure continues after UV exposure
- Excellent adhesion to metals and glass
- Outstanding chemical and solvent resistance
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CAS Number
25068-38-6
Category
Adhesive / Sealant AdditivesAvailability
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