6. Mold material
Mold pallets are usually made of non-alloy tool steel (no.1.1730, DIN code C45W). For mold pallets that need to withstand high temperature of 170 ℃ -210 ℃, considering impact resistance, pre-tempered steel (no. 1.2312, DINcode 40 CrMn-M oS 8 6). For the mold support plate with the cavity, it should be made of Ni steel with nitriding or tempering heat treatment to ensure its high temperature resistance.
For high filling LSR, such as oil-resistant LSR, it is recommended to use harder materials to make molds, such as bright chrome-plated steel or powder metal specially developed for this purpose (no. 1.2379, DINcode X 155 CrVMo121). When designing molds with high wear materials, those parts that are subjected to high friction should be designed to be replaceable so that the entire mold does not need to be replaced.
The inner surface of the cavity has a great influence on the finish of the product. The most obvious is that the shaped product will completely match the surface of the mold cavity. Molds for transparent products should be made of polished steel. Surface-treated Chin / Nickel steel has extremely high abrasion resistance, while polytetrafluoroethylene (PTFE) / Nickel makes demolding easier.