MR. JO JH 8357 – Crystal-Clear, Low-Viscosity Hardener for Glossy Decorative & Protective Epoxy Coatings
MR. JO JH 8357 – Crystal-Clear, Low-Viscosity Hardener for Glossy Decorative & Protective Epoxy Coatings
JH 8357 is a clear, low-viscosity modified amine curing agent designed for use in high-performance epoxy systems. It is specially developed to work seamlessly with JR 3013 and JR 3000 resins, providing excellent processing characteristics and superior end-use performance.
The product is known for its very low color, easy handling, and strong adhesion properties. When cured, it produces smooth, glossy, and bubble-free coatings that are highly durable. Its clarity and clean finish make it the preferred choice for transparent, decorative, and protective epoxy coatings where appearance matters as much as performance.
JH 8357 offers a good balance of strength, chemical resistance, and aesthetics, ensuring long-lasting results even in demanding industrial and architectural applications.
Technical Properties
- Amine Value [mg KOH/g]: 450–500
- Viscosity [mPa·s @ 25˚C]: 150–350
- Color [Gardner]: ≤2
- Density [g/cc @ 25˚C]: 1.00–1.05
Key Features & Benefits
✔ Crystal clear finish – very low color ensures clarity and brightness in final applications
✔ Smooth, glossy appearance – cures without bubbles or surface imperfections
✔ Low viscosity – easy to mix, pour, and apply, even in thin-film coatings
✔ Excellent adhesion – bonds strongly to substrates for long-term performance
✔ Durability – resists chemical attack, abrasion, and environmental exposure
✔ Versatility – suitable for both decorative and protective coating applications
Applications
JH 8357 is widely used in:
- Clear and decorative epoxy coatings for floors, furniture, and surfaces
- Transparent topcoats that enhance aesthetics while providing protection
- Industrial protective coatings requiring gloss and clarity
- General-purpose epoxy systems where smoothness and bubble-free curing are important
Usage Guidelines
- Recommended dosage: 45 phr with JR 3013 or JR 3000 resins
- Ensure substrates are clean, dry, and dust-free before application
- Mix resin and hardener thoroughly to avoid incomplete curing or surface defects
- Apply under recommended temperature and humidity conditions for best results
Why Choose JH 8357?
With its combination of clarity, performance, and ease of application, JH 8357 is a trusted solution for industries that demand aesthetic appeal without compromising durability. Whether used in interior décor, industrial coatings, or protective finishes, it delivers results that last.
Formulation & Processing Notes
- Use fillers or pigmentation as needed — JR 3016’s viscosity allows for good dispersion without over-shearing.
- For adhesive applications, substrate preparation (clean, dry, primed if needed) improves bond reliability.
- Cure schedule should be matched to desired performance: fast amine cures for speed, slower hardeners or elevated post-cure for improved chemical or thermal resistance.
- For flooring or topcoats, ensure film thickness is controlled; thicker layers may require longer cure times or staged application to avoid blush or incomplete cure.
Conclusion
JR-3016 delivers a compelling mix: low-to-medium viscosity, modified resin convenience, and performance nearer to what you expect from higher solids or mid-viscosity resins.
If your next project needs adhesives that flow well into gaps, topcoats that level nicely, or flooring layers that combine fluidity with durability, JR-3016 is an excellent resin backbone to build from.
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