Toughened Epoxy Adhesive (Impact Resistant)
Key Features
- CTBN/core-shell rubber toughening for quasi-ductile fracture
- High impact peel (≥25 N/mm) and T-peel (≥8 kN/m) strength
- Superior fatigue life under dynamic loading vs brittle epoxy
- 2:1 mix ratio, room temperature cure
- Ideal for mixed-material joints in automotive and marine structures
This toughened two-component epoxy structural adhesive incorporates reactive rubber tougheners (CTBN or core-shell rubber) to dramatically improve impact resistance, peel strength, and fatigue life compared to standard brittle epoxy adhesives. Tensile shear strength ≥20 MPa on steel, T-peel strength ≥8 kN/m, and impact peel strength (ISO 11343) ≥25 N/mm. The rubber toughening modifies the fracture mechanism from brittle to quasi-ductile, absorbing substantially more energy before failure. Mix ratio is 2:1 by volume. Cure at room temperature: fixture in 60–90 min, full cure in 24 h. Service temperature -40°C to +100°C. Ideal for FRP-to-steel joints subject to vibration, dynamic loading, and thermal cycling, which cause fatigue in untoughened epoxy joints. Used in automotive structural bonding, wind blade web-to-shell bonding, marine hull stringer bonding, and transport vehicle assembly.
Specifications
| Parameter | Value |
|---|---|
| Full Cure | 24 h RT |
| Service Temp | -40°C to +100°C |
| Mix Ratio (vol) | 2:1 |
| T-Peel Strength | ≥ 8 kN/m |
| Fixture Time (23°C) | 60–90 min |
| Tensile Shear Strength | ≥ 20 MPa |
| Impact Peel (ISO 11343) | ≥ 25 N/mm |
Applications
FAQ
CTBN (carboxyl-terminated butadiene-nitrile) is a reactive liquid rubber that chemically bonds into the epoxy network, phase-separating into rubber domains during cure that act as crack-blunting and energy-absorbing sites. Core-shell rubber (CSR) particles are pre-formed rubber spheres with a hard shell, which are uniformly dispersed in the matrix and act similarly. CTBN gives higher peel strength; CSR maintains higher Tg and has less effect on modulus. This formulation may use either or both depending on the target property balance.
Direct Contact
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