Poured Block Molds
The most basic type of mold is the poured block mold. In this first tutorial we explain the planning and rubber selection process of a seamless block mold In this tutorial we use 71-10 to create a fast, stretchy, 1 piece mold.
Veneer stone is typically cast from a block mold. For large molds for concrete, urethane rubber is preferable as it has a much higher abrasion resistance than silicone. In this tutorial we explain how to make a master mold for reproducing veneer stone molds for mass production.
Some resin parts may require multi-piece molds or molds with vents and sprues to allow for better flow of EasyFlo or 1512 resin through the mold.
When casting thin parts in EasyFlo Resin, vents are crucial to achieving consistent, bubble-free parts. In this tutorial we address venting of complicated parts using TinSil 80-15 silicone and EasyFlo resin.
2 Piece molds may also be created using the block mold method. In this tutorial we make a 2 part mold of a model car body. To make a fast mold that would hold up well in production, we used PlatSil Gel-25 for our silicone mold rubber. 2350 was used as a release.