Why is unsaturated polyester resin used in sheet molding? Why don't short fiber moulding plastics use unsaturated polyester resins?
BMC SMC produced a good sheet or mass, there is a mature thickening process, the temperature should be placed for more than a dozen hours or more time to mature thickening.
Group materials and sheets are generally made without packaging and resin, but some of the other resins that are modified have thickening properties and molding requirements are also available.
The requirement of BMC SMC process is that the material can be thickened, and the thickening properties of unsaturated resins are better
