2-Part MMA Adhesive (Flexible Grade)
Key Features
- Flexible cured adhesive (Shore A 70–85) accommodates thermal movement and vibration
- High elongation (30–80%) and T-peel strength (≥8 kN/m)
- No priming required on most substrates
- Ideal for large panel bonding in transport vehicles
- Prevents fatigue cracking at bond line under cyclic loading
This flexible grade two-component MMA adhesive incorporates a plasticizer or reactive flexibilizing monomer to produce a semi-flexible cured adhesive with Shore A hardness of 70–85, superior elongation (30–80%), and excellent peel and impact resistance. Unlike rigid MMA adhesives, the flexible grade accommodates differential thermal expansion between dissimilar materials, panel flutter in large vehicle panels, and vibration in transport applications. T-peel strength exceeds 8 kN/m. Impact peel strength is substantially higher than rigid MMA. Tensile shear strength is 8–14 MPa — lower than rigid grades but still structural. Mix ratio 10:1, open time 15–20 min at 23°C. Ideal for bonding large FRP body panels to metal subframes in buses, trucks, and agricultural equipment where differential thermal movement and vibration fatigue are design constraints.
Specifications
| Parameter | Value |
|---|---|
| Service Temp | -40°C to +90°C |
| Mix Ratio (vol) | 10:1 |
| T-Peel Strength | ≥ 8 kN/m |
| Open Time (23°C) | 15–20 min |
| Elongation at Break | 30–80% |
| Tensile Shear Strength | 8–14 MPa |
| Shore A Hardness (cured) | 70–85 |
Applications
FAQ
Choose flexible MMA when: (1) bonding large panels where thermal cycling causes differential movement >0.5 mm across the bond area; (2) the joint will experience continuous vibration or fatigue loading; (3) peel forces are expected in service (e.g., peeling forces from pressure washing, wind uplift, or impact); (4) the substrates have significantly different CTE values (e.g., GRP to steel). Use rigid MMA where maximum shear strength is the priority and flexibility is not needed.
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