ARALDITE® 2015-2 : the next-generation thixotropic structural epoxy by Huntsman
Samaro presents ARALDITE® 2015-2, a two-component epoxy thixotropic paste with sag resistance up to ~10 mm, engineered for robust structural bonding on SMC/GRP and dissimilar materials (metals, composites, rigid plastics). The new formulation is part of ARALDITE®’s 2025 evolution, formulated without the intentional addition of substances classified as CMR*.
ARALDITE® 2015-2: consistent performance, modernized HSE profile
Developed to replace ARALDITE® 2015-1 following an HSE reclassification of a raw material, 2015-2 pairs resin AV 5308-1 with hardener HV 5309-2. The goal: preserve 2015-1’s handling behavior and performance while updating the regulatory/HSE profile.
What’s changing between ARALDITE® 2015-1 and 2015-2
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Raw-material substitution: switch to AV 5308-1 resin (hardener HV 5309-2 unchanged).
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Similar behavior in use and in service: viscosity, thixotropy, mechanical strength and durability aligned with 2015-1 according to Huntsman comparative testing.
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2025 transition timeline: 2015-2 is part of the new non-CMR wave launched in autumn 2025.
Key benefits
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Thixotropic / non-sag: neat bead placement on medium to wide gaps, holds up to ~10 mm thickness without slump.
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Material versatility: SMC, GRP, metals, composites, dissimilar substrates.
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Comfortable handling: work life (10 g, 23 °C) ≈ 30–35 min; progressive strength build at room temperature.
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Structural & tough: high-toughness epoxy paste for joints resistant to impact/peel and harsh environments.
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Modernized HSE profile: part of ARALDITE®’s next-gen range formulated without the intentional addition of CMR substances, enabling a smooth industrial transition.
| ID Card – ARALDITE® 2015-2
Type : |
Thixotropic, paste-grade 2-component epoxy adhesive. |
| Sag resistance | ~10 mm. |
| Mixing ratio: | Resin-to-hardener ratio: 100:100 by weight and by volume (i.e., 1:1). |
| Appearance (mixed): | Beige paste. |
| Open time (10 g, 23 °C) | 10 g, 23 °C : ≈ 30–35 min |
| Handling strength (23 °C): | ~4 h to reach 1 MPa; ~7 h to reach 10 MPa. |
| Tg (Tan δ) : | ≈ 75 °C (après 16 h à 40 °C). |
2015-2 in practice: what your operators will experience
- Clean beads, no slump on fillets and thick deposits.
- Stress-free positioning thanks to ~30 min open time (10 g): clamp neatly, clean squeeze-out, then let strength build at 23 °C (~1 MPa ≈ 4 h / ~10 MPa ≈ 7 h).
- SMC/GRP & mixed-material assemblies: ideal for industrial bodywork, marine, rail, sandwich panels, and equipment.
Application best practices
Surface preparation
Degrease (acetone/IPA depending on substrate), apply controlled abrasion (fine grit-blast on metals/composites), dust off, then degrease again.
Metering & mixing
Maintain 1:1 by weight/volume. Mix thoroughly to full homogeneity. Purge before dispensing when using 2K cartridges.
Dispensing
Lay continuous beads with steady pressure. Avoid entrapping air. Works in thicknesses up to ~10 mm without sag.
Curing
At 23 °C: target ~4 h to 1 MPa and ~7 h to 10 MPa. Acceleration possible at 40 °C (~65 min to 1 MPa; ~120 min to 10 MPa). Always verify suitability against your part design and internal qualification standards.
Durability & testing
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Shear strength vs. temperature: 2015-1 and 2015-2 show very similar profiles from –60 °C to +140 °C (ISO 4587, after 16 h at 40 °C).
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Chemical & humidity aging: Comparable behavior (90-day immersion; cataplasma per ISO 9142 E2).
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Tensile properties: Modulus ~1.6 GPa, UTS ~27 MPa (2015-2), elongation at break ~6.3% (tough profile).
Industries & use cases
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Transport & industrial bodywork: GRP/SMC skins, reinforcements, metal accessories.
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Marine & rail: hulls, decks, sandwich panels, secondary structural elements.
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Equipment & energy: composite frames, covers, metal–composite interfaces.
❓FAQ – ARALDITE® 2015-2
🔹 Does the mix ratio change compared with 2015-1?
No. It remains 100:100 by weight and by volume (1:1) for both 2015-1 and 2015-2 (resin AV 5308-1 + hardener HV 5309-2).
🔹 What are the open time and strength build at 23 °C?
30–35 min open time (10 g). ~4 h → 1 MPa and ~7 h → 10 MPa in shear on standard specimens.
🔹 Can it be applied in thick sections?
Yes. The thixotropic paste is non-sag up to ~10 mm.
🔹 Is the product non-CMR?
It is part of ARALDITE®’s 2025 next-gen range formulated without the intentional addition of CMR* substances, while maintaining performance. (Always refer to the current SDS.)
🔹 How to transition from 2015-1 to 2015-2?
According to Huntsman, replacement is possible without changing your process conditions or part designs — validate on your internal standards.
