MR. JO JH 8378 – Fast Reactivity with Site-Friendly Handling
MR. JO JH 8378 – Fast Reactivity with Site-Friendly Handling
Every project has its own rhythm. Some demand faster turnaround, others need flexibility for applicators to work comfortably. Mr. JO Hardener 8378 has been developed to offer the best of both worlds — a phenalkamine hardener that cures rapidly in adverse conditions, while remaining easy to apply and handle at site.
What is 8378?
Mr. JO Hardener 8378 is a low-to-medium viscosity phenalkamine curing agent, comparable to global benchmarks like NC558. It is specially formulated for marine, protective, and infrastructure coatings where moisture tolerance, chemical resistance, and cold cure capability are critical.
Technical Profile
- Amine Value (mg KOH/g): 320–360
- Viscosity @ 25 °C: 500–1,500 mPa·s (easy application, brush/roller/spray compatible)
- Color (Gardner): ≤17
- Density @ 25 °C: 0.95–1.00 g/cc
- Mix Ratio (phr with standard Bis-A epoxy resin): 50–60
- Pot Life (100 g @ 25 °C): ~45 minutes
- Tack Free Time: 4–6 hours (thin film)
- Hardness (Shore D): 75–80 after full cure
This profile makes JH 8378 a versatile choice when projects need both speed and reliability.
Applications
- Marine coatings – hulls, ballast tanks, and splash zones exposed to seawater
- Industrial coatings – refineries, pipelines, tank linings
- Infrastructure protection – bridges, ports, water treatment plants
- Repair systems – works well with fillers to produce epoxy mortars
Because of its low-to-medium viscosity, applicators find it especially convenient for roller and spray applications at project sites.
Why Choose JH 8378?
- Fast Cure at Low Temperatures – works effectively even at 5–10 °C.
- Moisture & Saltwater Tolerance – reliable bonding on damp substrates in marine conditions.
- Balanced Pot Life – enough working time with quick strength build-up.
- Site-Friendly Packs – offered in contractor-oriented packs (1 kg, 5 kg, 10 kg, 20 kg).
The Bottom Line
When time is short and conditions are tough, JH 8378 steps up. It provides the fast reactivity, adhesion strength, and moisture resistance needed to keep critical infrastructure and marine projects on schedule — without compromising on durability.
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