Araldite® 2021 is a two-component, toughened, general purpose methacrylate adhesive that cures at room temperature for rapid assembly operations on a wide range of substrates. It cures rapidly, has high peel strength, bonds plastics, composites and metals and is suitable for service at temperatures up to 100 °C. It can be used effectively with little surface preparation. It is available in cartridges incorporating mixers.
Application Properties
- 2021/A off white, 2021/B beige/yellow, mixed pale yellow; viscosity (25 °C) mixed approx. 45,000 cP
- Mix ratio A:B by weight 100:90, by volume 100:100; pot life (100 g, 25 °C) 2–3 min
- To 1 MPa lap shear: 8 min at 23 °C, 2 min at 40 °C; to 10 MPa: 18 min at 23 °C, 5 min at 40 °C
- An adhesive layer of 0.05–0.10 mm gives the greatest lap shear strength; volume reduces by approx. 13% during cure
- Flash point A and B −12 °C (10 °F)
Cured Properties
- Lap shear on sand blasted metals (ISO 4587, cured 16 hours at 40 °C): aluminium 22.4 MPa, steel 23.2 MPa, stainless steel 30.0 MPa
- Roller peel (ISO 4578) 11 N/mm; hardness 78 Shore D; elongation at break 50–75%
- Flexural strength 36.0 MPa; flexural modulus 1430.2 MPa (ISO 178)
| Packing | 50 ML |