Plastics & Metals Flashcards
(122 cards)
Long chain molecular structures from common elements and compounds by chemical synthesis
Plastics
Polymeric, Polymers and regarded as potential plastics
Plastics
necessary degree of polymerization has been achieved, long chain, by heat can be softened and resoftened
Thermoplastic
Polymerization has been arrested at a stage, short chain molecules, more resistant to heat, can’t be remolded
Thermosetting
Can be foamed with suitable gassing agents to form rigid shell structures
Rigid Foam Plastics
Very high thermal resistance for given thickness, low water absorption and low water vapour permeability, good thermal stability
Polyurethane
Relatively low resistance for given thickness, high strength and very good thermal stability
Phenol-Formaldehyde (Phenolic Foam)
HIgh Thermal resistance for given thickness but low mechanical strength, high water absorption and high water vapour permeability
Urea-Formaldehyde
Cavity Wall Insulation
Urea-Formaldehyde
Good insulation efficiency, high strength, good chemical and moisture resistance, restricted to spray applications
Epoxy
Rapid moldings techniques for the production of rigid shapes or shells
Polyester Resin Fiberglass Laminates
The wax coat is first huffed off the pattern, which is then coated with polyester emulsion wax release
GRP Former Mould
The former mould is treated with emulsion was, wax polish and release agent
Finished Mould
“Acrylic Sheet” is readily obtainable in clear transparent pastel shades full colors and transfusing and fluorescent colors
Perspex
has universal uses as fiber material for it can be cold drawn to five times its original strength
Nylon
Familiarly known as Formica, Wilson Art, composed of craft paper impregnated with phenolic resins while surface can be purely decorative
Decorative Plastic Laminates
was largely made of mild steel tube, hence familiar name tubular steel furniture
Hitherto Metal Furniture
Composed mainly of iron with small additions of other metals and substances
Ferrous Metal
Types of Metal
Ferrous Metal
Non-Ferrous Metal
These contain little or no iron
Non-Ferrous Metal
Iron with traces of silicate, it is easily worked and is tough and ductile
Wrought iron
Iron with small amount of carbon, silicon =, sulfur, etc., a high fire resistance
Cast Iron
Iron with up to 0.3 per cent carbon
Mild Steel
Steel with chromium and nickel
Stainless Steel