Plastics Flashcards
1
Q
- long chain molecular structures evolved from common elements and compounds by chemical synthesis
- group a synthetic materials
A
Plastics
2
Q
- type of plastic
- becomes soft when heated and hard when cooled
- highly recyclable; remolding/reshaping capabilities
A
Thermoplastic
3
Q
- type of plastic
- set into a permanent shape when heat & pressure are applied during the forming stage
- more resistant to high temperatures but cannot be recycled or reshaped/remolded
A
Thermosetting
4
Q
- type of plastic application
- forms rigid shell structures
- ex.; self-supporting chairs shells, imitation mouldings, and wood carvings
A
Rigid Foam Plastics
5
Q
- application of Rigid Thermoset Plastic Foam
- high thermal resistance; low water absorption and low water vapor permeability
- usage: thermal insulation, refrigeration, pipe lagging
A
Polyurethane
6
Q
- application of Rigid Thermoset Plastic Foam
- relatively low resistance; high strength and good thermal stability
- usage: insulation for flat roofs
A
Phenol-formaldehyde (Phenolic Foam)
7
Q
- application of Rigid Thermoset Plastic Foam
- high thermal resistance but low mechanical strength; high water absorption & water vaper permeability
- usage: cavity wall insulation
A
Urea-formaldehyde
8
Q
- application of Rigid Thermoset Plastic Foam
- good insulation efficiency; high strength, good chemical & moisture resistance
- usage: spray applications for storage tanks and vessels
A
Epoxy
9
Q
- type of plastic application
- composed of laminations of chopped strand glass material impregnated with polyester resin
A
Polyester Resin Fiberglass Plastic
10
Q
- type of plastic application
- Glass-reinforced plastic or fiberglass
A
GRP Former Mould
11
Q
- type of plastic application
- former-mould is treated with emulsion wax, wax polish * a release agent, then a single get coat followed by a glass material and resin
- smooth surface on one side only
A
Finished Mould
12
Q
- type of plastic application
- acrylic sheet
- obtainable in clear transparent, pastel shades, full colors, and transfusing & fluorescent colors.
- Colors: 1/25” to 1/2” thk. (1mm to 12.5mm thk.)
Clear Sheet: 2” thk (50mm thk.
Clear Rod & tube: 1” diameter (25mm) - can be cut very easily using a saw
A
Perspex
13
Q
- type of plastic application
- has universal uses as a fiber material; can be cold drawn to 5x its original strength
- can be cut, shaped and drilled with normal hand tools; used in knock-down fittings
A
Nylon
14
Q
- type of plastic application
- composed of layers of craft paper impregnated with phenolic resins
- known as Formica, Wilson Art, Consulweld etc.
A
Decorative Plastic Laminates
