Plexus® MA3940 is a two-part methacrylate adhesive designed for structural bonding of thermoplastic, metal, and composite assemblies. Combined at a 10:1 ratio, MA3940 has a working time of 12 to 15 minutes and achieves approximately 75% of ultimate strength in 25 to 30 minutes at 74°F (23°C). Plexus MA3940 is the standard for applications requiring an adhesive to bond substrates sensitive to chemical crazing such as acrylic or polycarbonate. In addition, this product provides a unique combination of excellent fatigue endurance, outstanding impact resistance, and superior toughness. Plexus MA3940 is supplied in ready-to-use cartridge, 5-gallon (20-liter) pails, or 50-gallon (200-liter) drums to be dispensed as a non-sagging gel.
Key Features
- Medium working time 12 – 15 mins
- Exceptional low temperature impact resistance
- Fast, consistent strength development at room temperature
- High elongation and excellent stress distribution
- Low modulus and non-crazing
Key Substrates
- Thermoplastics ABS/ ABS Blends, Acrylics, PBT, Polycarbonate, Rigid PVC, TPUs
- Composites DCPD, FRP, Gelcoat, Phenolics, Epoxy Based Composites, RIM
- Coated metals Powder coated or E-coated Metals
- Raw metals with PC120 Aluminum, Stainless Steel, Raw Steel, etc.
| Typical Uncured Properties | Part A | Part B |
| Color | Off-White | Cream/Blue |
| Mix Ratio by Volume | 10 | 1 |
| Mix Ratio by Weight | 9.00 | 1.00 |
| Component Density, g/ml | 0.93 | 1.04 |
| Component Viscosity, cP x1000 | 135 – 175 | 35 – 70 |
| VOC’s during cure, % | < 2 | |
| Shelf Life, Months | 13 | |
