Thermo setting plastics Flashcards
Name the five generic properties of thermo setting plastics.
Not remouldable, not recyclable, self colouring, self finishing and they do not melt.
Name at least two thermosets.
Epoxy resins, polyester resins, urea formaldehyde and melamine formaldehyde.
What are thermosetting plastics based on?
Oil.
Name one use of urea formaldahyde
Electrical fittings/sockets.
Name one use of phenol formaldehyde.
Saucepan handles.
Name one use of melamine formaldehyde.
Heat resistant surfaces (kitchen worktops)
What is polyester resin used for?
It is the plastic component of fiberglass/GRP.
What is epoxy resin used for?
As a type of glue as it can bond anything to everything.
How does compression moulding work?
You have the block of plastic and it goes into the female mould above a heater. The former then pushes down on the plastic as the plastic is also heated up so it will melt and mould the desired shape.
How does calendaring work?
The plastic dough gets fed through feed rollers and gap/nip rollers and it eventually becomes thinner. The plastic then gets fed through tension rollers before embossing/cooling rollers and then it gets released via the take-up roller.
