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High reactivity with amine and anhydride curing agents for rapid gelation and short cycle times.
Excellent adhesion to metals, composites, and cured epoxy substrates without surface priming.
Low viscosity (10,000–12,000 cP at 25°C) enabling easy processing via casting, impregnation, and filament winding.
Superior electrical insulation properties with high dielectric strength and volume resistivity.
Good thermal stability with glass transition temperature (Tg) of 120–125°C after full cure with DDS.
Electrical encapsulation and potting of high-voltage transformers and busbar insulators.
Matrix resin for filament-wound pressure vessels and composite tanks in industrial gas storage.
Structural adhesive formulation for aerospace secondary bonding and metal-to-composite joining.
Insulating coating for copper windings in electric motors and generators.
Core material in laminated busbars and DC-link capacitors for power electronics modules.
| Chemical Type | Diglycidyl ether of bisphenol-F (BPF) |
| Product Form | Clear, low-viscosity liquid |
| Appearance | Amber to pale yellow transparent liquid |
| Epoxy Equivalent Weight (EEW) | 178–184 g/eq |
| Viscosity (25°C) | 10,000–12,000 mPa·s |
| Chloride Content | ≤ 800 ppm |
| Softening Point | Not applicable (liquid at room temperature) |
| Storage Stability | ≥ 12 months at <25°C in sealed original container |
Q1: What is the primary function of KUKDO SM634 in epoxy formulations?
A: KUKDO SM634 is a reactive diluent designed to reduce viscosity and improve processability of standard bisphenol-A or bisphenol-F based epoxy resins without significantly compromising thermal stability or mechanical performance.
Q2: Is KUKDO SM634 suitable for high-gloss coatings and electrical encapsulation applications?
A: Yes — its low volatility, good compatibility with common epoxy hardeners, and ability to support high crosslink density make it well-suited for demanding coating systems and electrical insulation applications where surface finish and dielectric integrity are critical.
Q3: How does KUKDO SM634 compare to non-reactive diluents in terms of final film properties?
A: Unlike non-reactive diluents, SM634 participates in the curing reaction, resulting in lower extractables, improved chemical resistance, and enhanced long-term durability of the cured network.
Q4: Can KUKDO SM634 be used with amine, anhydride, and phenolic hardeners?
A: Yes — SM634 demonstrates broad compatibility across conventional epoxy curing chemistries, including aliphatic and aromatic amines, cyclic anhydrides, and novolac-type phenolics, though optimal dosage and cure schedule should be validated per formulation.
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