Dalchem 421 Epoxy System - Multipurpose Laminating & Casting Epoxy
Solvent-free, liquid epoxy resin system.
Dalchem 421 is a solvent-free, liquid epoxy resin system specifically designed as an industrial-grade laminating and tooling epoxy that cures at room temperature. Its low viscosity allows easy wetting of fibreglass and fillers, making it ideal for laminating, casting, adhesive bonding, and general-purpose applications. The system cures to form a hard, high-impact-resistant material with excellent mechanical properties, widely used in woodworking, boatbuilding, foundry pattern making, and general composite fabrication.
Features & Benefits
- Solvent-free formulation – low odour and easy handling
- Low viscosity – excellent flow and filler incorporation
- High-strength bonding for wood, composites, and tooling
- Room-temperature cure – no ovens required
- Versatile – laminating, casting, bonding, and repairs
Typical Applications
- Fibreglass laminating and boatbuilding
- Woodworking adhesives and joinery
- Casting of foundry patterns, plugs, and checking tools
- General-purpose resin laminating and repairs
- Composite component fabrication
Technical Data
- Mix Ratio (by weight): 100 parts Resin : 25 parts Hardener (5:1)
- Pot Life (500 g @ 25 °C): 50–60 minutes
- Thin Laminate Gel Time (25 °C): 4.5 hours
- Demould Time (25 °C, 15 mm cast): 12 hours
- Mixed Viscosity (mPas @ 25 °C): 850
Cured Properties
- Shore D Hardness: 84
- Heat Distortion Temperature (24 hrs @ 25 °C): 50 °C
- Compressive Strength: 55 MPa
- Flexural Strength: 81 MPa
- Modulus of Elasticity: 3.1 MPa
- Linear Shrinkage: 0.1–0.3%
- Tensile Elongation: 9%
Packaging
Supplied as matched resin and hardener pack sizes suitable for professional and hobbyist use.
Safety
Consult the Data Sheet before use. Wear appropriate PPE and follow safe handling practices.
