• Item Name: ARALDITE® AV 4738 / HARDENER HV 4739
• Manufacturer: Huntsman
• Technologies: Epoxy & Epoxy Derivatives, 2-component adhesive
• Color: Grey paste
• Cure Type: Ambient temperature, post-curing recommended for optimal performance
• Package Size: Contact to Techniq VN for details
• Shelf Life: Contact to Techniq VN for details
ARALDITE® AV 4738 / HARDENER HV 4739 is a two-component, ambient temperature curing epoxy adhesive in paste form. It provides strong, durable bonds with temperature resistance up to 150°C after post-curing. The adhesive demonstrates excellent chemical resistance, good gap-filling capability, and non-flowing properties for ease of application. It is suitable for bonding metals and reinforced polymer composites, including GRE, GRP, ABS, and SMC. Performance is further enhanced by post-curing, and the product has potential certification for potable water applications.
Structural bonding of metals and reinforced composites (GRE, GRP, SMC, ABS)
Pipe bonding and plumbing applications
Joints requiring high chemical and temperature resistance
Applications requiring gap filling and non-flowing adhesives
Ambient curing with optional post-cure for optimum performance
Surface Pretreatment: Clean surfaces with acetone or other degreasing agents. Avoid low-grade alcohols, gasoline, or paint thinners. For best results, mechanically abrade or chemically etch surfaces, followed by a second degreasing.
Application:
Mix resin and hardener (weight ratio 100:25–27.5).
Apply with spatula to pretreated surfaces and clamp immediately.
Achieves minimum shear strength at 23°C: 1 MPa in 3 hours, 10 MPa in 4 hours.
Post-cure recommended for optimum properties: e.g., 2 hours at 80°C or 1 hour at 120°C.
| Property | Value | Unit | Condition |
|---|---|---|---|
| Mix Ratio | 0.25–0.275 | % (W) | Hardener : Resin |
| Density | ~1.6 | g/cm³ | at 25°C |
| Gel Time | 40–50 | min | at 40°C |
| Glass Transition Temperature (Tg) | 120 | °C | Post-cured |
| Lap Shear Strength | ≥10 | MPa | at 23°C |
| Viscosity | 40–50 | Pa·s | at 25°C |
| Appearance | Grey | Paste | – |
Cured Joint Performance:
Metal-to-metal, plastic-to-plastic, and composite-to-composite joints achieve strong lap shear strengths after ambient cure + post-cure.
Roller peel strength on aluminium: 2.6 N/mm (7 days at 23°C), 4.6 N/mm (+80°C, 1h), 5.6 N/mm (+125°C, 1h).
Good resistance to water immersion, tropical weathering, and various chemicals.
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