Polyester: This is an extremely versatile, fairly inexpensive, polymer.
Unsaturated polyester combines an unsaturated dibasic acid and a glycol dissolved in a monomer, generally styrene, including an inhibitor to stabilize the resin. Organic peroxides, such as methyl ethyl ketone peroxide (MEKP) and a promoter are combined with the resin to initiate a room temperature (R.T.) cure.
In this liquid state, polyester may be processed by numerous methods, including Hand Layup (HLU), vacuum bag molding, spray-up and compression molded Sheet Molding Compound (SMC), etc. The resin can also be B-staged after application to chopped reinforcements and continuous reinforcement, pre-preg. Solid molding compounds in the form of pellets or granules are also used in processes such as compression and transfer molding.
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