MR. JO JH 8379 – Ultra-Low Viscosity, Maximum Penetration
MR. JO JH 8379 – Ultra-Low Viscosity, Maximum Penetration
In repair and protection projects, success often depends on how deeply the resin system can penetrate and bond with the substrate. JH 8379 has been specially developed as an ultra-low viscosity phenalkamine curing agent, making it the go-to choice for crack injection, priming damp surfaces, and achieving deep penetration into concrete and porous substrates.
What is JH 8379?
JH 8379 is a phenalkamine hardener comparable to NX5198, offering all the advantages of phenalkamine chemistry — moisture tolerance, chemical resistance, and cold cure — but in a uniquely thin, free-flowing form. This makes it a game-changer for field applications where penetration and wetting are critical.
Technical Profile
- Amine Value (mg KOH/g): 270–320
- Viscosity @ 25 °C: 80–200 mPa·s (water-like flow)
- Color (Gardner): ≤14
- Density @ 25 °C: 0.93–0.97 g/cc
- Mix Ratio (phr with Bis-A epoxy resin): 45–55
- Pot Life (100 g @ 25 °C): ~40 minutes
- Tack Free Time: 5–6 hours (thin film)
- Hardness (Shore D): 70–75 after cure
This very low viscosity enables excellent substrate wetting and deep capillary penetration, which standard phenalkamines cannot achieve.
Applications
- Concrete crack injection – fills fine cracks and hairline voids effectively.
- Damp surface priming – creates a strong bond coat even on moist or humid substrates.
- Protective coatings – when blended with epoxy resins, ensures thin, uniform film build.
- Repair mortars & grouts – combines with fillers for fluid repair systems.
Its ability to penetrate deeply makes it especially popular in bridge maintenance, concrete rehabilitation, and marine structure repairs.
Why Choose JH 8379?
- Ultra-Low Viscosity – unmatched penetration for injection and priming.
- Moisture Tolerance – bonds even on damp concrete or humid conditions.
- Cold-Cure Performance – cures at low temperatures, keeping projects moving.
- Practical Site Packs – supplied in applicator-friendly sizes (1 kg, 5 kg, 10 kg).
The Bottom Line
When cracks are fine, substrates are damp, and performance cannot be compromised, JH 8379 delivers. Its ultra-low viscosity and robust phenalkamine chemistry make it a specialist hardener for injection and priming jobs that demand reliability and long-term durability.
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