Bonding agent
The bonding agent, also called a matrix, consists of resin and after the recipe is agreed – the application- specific fillers are added. Epoxy resin is used, as opposed to Methacrylate resin, and polyester resins exhibit less contraction (volume shrinking) and an improved processing time. When poured the bonding agent also acts as a lubricant between the elements of the filler, thus improving the flow characteristics. There can be no chemical reaction between the filler and the bonding agent. Cast parts containing epoxy resins as bonding agents are not suitable for operating temperatures of over 80°C.
Advantages of epoxy resins
- Low viscosity gives good flow characteristics
- Guarantee that the filler used is well lubricated
- Long gel time
- Slow hardening by precipitation, combined with low exotherms
- Good mechanical characteristics (tension, compression, bending, elastic modulus, thermal expansion)
- Good chemical characteristics, i.e. resistant to aggressive liquids
- Good long-term behavior
- Epoxy resins are certified for the food industry
