Thickness of the Porcerax II insert is very important for a couple of reasons. First, you want a thick enough part that will withstand injection pressure. If you go too thin you run the risk of cracking the material. The material has a base hardness of 30‐40 HRC and can withstand most of the variables regarding injection molding. Second, by using a piece of Porcerax II that is large enough to put in a drilled and tapped hole for an NPT fitting, you allow the Porcerax II material to be cleaned much easier. After the solvent has cleaned most of the trapped materials in the pores, place your NPT fitting in the Porcerax II material, plug it into your shop air, and let it blow through the Porcerax II material.