The MAIN characteristics of thermosets (literally 'setting under heat') is that they require curing, when they undergo a molecular cross-linking process which is irreversible and renders them infusible. They thus offer high thermal stability, plus good rigidity and hardness and resistance to creep For practical purposes, therefore, cured thermosetting resins can be recycled most effectively if ground to fine particles, when they can be incorporated into new laminates, as cost-effective fillers.
FRP stands for fiberglass-reinforced plastics. FRP is also used to mean fiber reinforced plastics. Other terms that are used interchangeably with FRP are reinforced thermoset plastic (RTP), reinforced thermoset resin (RTR) and glass-reinforced plastic (GRP). All of the above mentioned terms should not be confused with reinforced thermoplastic which is entirely different. FRP can be useful for many things including
Excellent composite properties. Very good chemical resistance. Good thermal properties. Very good electrical properties. Low shrinkage on curing. Can be B-staged.
Phenolic
Very good thermal properties. Good fire resistance (self-extinguishing). B-stage possible. Good electrical properties.
Polyester
Wide choice of resins; easy to use. Cure at room temperature and elevated temperature. Very good composite properties. Good chemical resistance. Good electrical properties.
Polymide and polyamide-imide
Excellent thermal properties. Good composite properties. Good Electrical Properties. Good fire properties.
Polyurethane
Good composite properties. Very good chemical resistance. Very high toughness (impact). Good abrasion resistance.
Silicone
Very good thermal properties. Excellent chemical resistance. Very good electrical properties. Resistant to hydrolysis, oxidation. Good fire properties (self-extinguishing)-Non-toxic.
Vinylester
Good fatigue resistance. Excellent composite properties. Very good chemical resistance. Good toughness.
