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High reactivity with standard amine and anhydride curing agents for rapid gelation and short cycle times.
Excellent adhesion to metals, composites, and treated plastics without requiring primers.
Low viscosity (12,000–15,000 cP at 25°C) enabling easy processing, impregnation, and air release.
Superior electrical insulation properties with high dielectric strength and volume resistivity.
Good thermal stability with glass transition temperature (Tg) of approximately 125–135°C after full cure.
Electrical encapsulation of transformers, reactors, and high-voltage insulators.
Structural adhesive formulations for aerospace composite bonding and automotive metal-to-composite joints.
Prepreg matrix resin for carbon fiber and fiberglass laminates in wind turbine blades and sporting goods.
Castable insulation systems for medium-voltage switchgear and busbar supports.
Coating and potting compound base for LED modules and power electronics requiring thermal management.
| Chemical Type | Bisphenol-A based liquid epoxy resin |
| Product Form | Clear to pale yellow viscous liquid |
| Appearance | Homogeneous, transparent, free of gels or particulates |
| Epoxy Equivalent Weight (EEW) | 185–195 g/eq |
| Viscosity (25°C) | 12,000–15,000 cP |
| Chloride Content | ≤ 800 ppm |
| Softening Point | Not applicable (liquid at room temperature) |
| Storage Stability | ≥ 12 months at 25°C in sealed containers |
Q1: What is the primary function of KD-407A in epoxy formulations?
A: KD-407A is a reactive diluent designed to reduce viscosity and improve processability of standard bisphenol-A or bisphenol-F based epoxy resins without significantly compromising final crosslink density or thermal performance.
Q2: Is KD-407A suitable for high-gloss, low-VOC coatings applications?
A: Yes — as a mono-functional reactive diluent, KD-407A helps lower VOC content while maintaining film integrity and surface aesthetics in industrial maintenance and protective coatings, especially where reduced solvent demand is required.
Q3: How does KD-407A compare to non-reactive diluents in terms of compatibility and final properties?
A: Unlike non-reactive solvents or plasticizers, KD-407A co-polymerizes into the epoxy network, eliminating volatility concerns and preventing leaching or migration in cured systems — resulting in improved chemical resistance and long-term dimensional stability.
Q4: Can KD-407A be used in adhesives and encapsulants requiring flexibility?
A: Yes — its mono-functional structure introduces controlled chain termination, which can moderate crosslink density and enhance toughness and impact resistance in structural adhesives and electronic encapsulants when balanced with other resin components.
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