Choosing the Right Polyamide Hardener: MR. JO JH 1051, JH 1056, JH 1425, JH 1424 Compared
Choosing the Right Polyamide Hardener: MR. JO JH 1051, JH 1056, JH 1425, JH 1424 Compared
Polyamide Hardeners – Why They Matter
Polyamide curing agents are the workhorses of epoxy systems, valued for:
- Excellent adhesion to diverse substrates
- Superior corrosion resistance and barrier properties
- Long pot life and user-friendly application
- Flexibility and impact resistance
- Compatibility with fillers and pigments
They are widely used in primers, adhesives, coatings, sealants, and marine protection systems. But with several choices available, the question arises: Which JPOXY polyamide hardener is right for your project?
Product Comparison
🔹 JH 1051 – Medium Viscosity, General Purpose
- Amine Value: 350–400 mg KOH/g
- Viscosity (25°C): 10,000–15,000 mPa·s
- Applications: Primers, laminates, corrosion-resistant coatings, grouts
- Strengths: Balanced performance, good filler acceptance, versatile use
👉 Best for general-purpose coatings and primers where strength + processability is key.
🔹JH 1056 – Low Viscosity, High Filler Loading
- Amine Value: 350–400 mg KOH/g
- Viscosity (25°C): 500–1,000 mPa·s
- Applications: Potting, encapsulation, mortars, adhesives
- Strengths: Very low viscosity, excellent filler loading, good wetting of powders
👉 First choice for potting, encapsulation, and mortars where ease of mixing and high filler loading is needed.
🔹 JH 1425 – Medium Viscosity, Marine & Industrial
- Amine Value: 290–320 mg KOH/g
- Viscosity (40°C): 8,000–12,000 mPa·s
- Applications: Adhesives, sealants, marine coatings
- Strengths: Solvent-free, long pot life, strong barrier properties
👉 Ideal for marine and heavy-duty industrial coatings where anti-corrosion and durability are critical.
🔹 JH 1424 – High Viscosity, Heavy-Duty Protection
- Amine Value: 210–240 mg KOH/g
- Viscosity (40°C): 45,000–60,000 mPa·s
- Applications: Industrial paints, primers, corrosion-resistant coatings, adhesives, marine
- Strengths: High flexibility, long pot life, strong adhesion
👉 Perfect for industrial primers and marine systems needing thickness, flexibility, and extended pot life.
Selector Guide
| Hardener | Viscosity | Amine Value | Key Strength | Typical Applications |
| JH 1051 | Medium (10,000–15,000) | 350–400 | Versatile, filler-friendly | Primers, laminates, coatings |
| JH 1056 | Low (500–1,000) | 350–400 | High filler loading, easy processing | Potting, encapsulation, mortars |
| JH 1425 | Medium (8,000–12,000 @40°C) | 290–320 | Long pot life, marine-grade | Sealants, marine coatings, adhesives |
| JH 1424 | High (45,000–60,000 @40°C) | 210–240 | High flexibility & durability | Primers, marine & industrial paints |
Final Takeaway
- Choose JH 1051 for balanced, general-purpose systems.
- Choose JH 1056 for low-viscosity, high-filler formulations.
- Choose JH 1425 for marine coatings & long pot life applications.
- Choose JH 1424 for heavy-duty primers and high-flexibility protection.
With these four standard polyamide curing agents, JPOXY ensures formulators can match the right hardener to the right application, balancing viscosity, curing speed, and performance.
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