How To Build An Epoxy Resin Casting Mold
How To Build An Epoxy Resin Casting Mold : MATERIAL USED FOR THE MOLD:
Building an epoxy resin casting mold is a very important step when creating a river table or other casting projects.
Some materials demonstrate superior insulating qualities than others. The material used to make the mold is important. Melamine, wood, polyurethane and silicone demonstrate good up to high insulation capacities, so can increase the exothermic effect. HDPE – High Density polyethylene can also be use to create a mold. The HDPE will create a better and cleaner surface compare to melamine and tape. Epoxy will not adhere to HDPE, therefore you won’t need to apply tape.
Choose Your Materials Wisely
As you may know epoxy will stick to many materials and surfaces. Among them, we include:
- High Density Polyethylene (HDPE)Silicone
- Any surface coated with a release agent – Silicone Based Release Agent for Molds – CHILL RELEASE 110
The cheapest and most accessible material is melamine, Medium Density Fiber, or plywood for the base and walls. AVOID: The metal demonstrates great heat dissipation ( Heat Sink) capacity which will greatly slow down the exothermic effect and directly the polymerization time. The metal will absorb a certain amount of heat required to cure the epoxy. Only extremely reactive epoxy systems need to be slowdown using a metal mold, meaning the epoxy solution is not adapted for this application.
REMEMBER : The epoxy solution should be working for you and not the opposite by adding extra work or costs. Using the right product for the right application is the only way to achieve better long lasting results.
Prevent The Epoxy From Sticking To Your Mold
It is essential to fill all inserts and mold cavities with “Tuck Tape” or “Tyvek” tapes to prevent leaks. Covering the bottom and walls of the mold with Polypropylene film will help prevent the epoxy from sticking to the mold and allow an easy removal of your river table or other epoxy project once the resin is fully cured.
How to seal your mold
Ready to pour your Epoxy
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