Plastics & Metals Flashcards
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
Composition varied by addition of different elements such as nickel ,chromium, copper, manganese to molten steel
Tool and Alloy Steel
has high resistance to corrosion
Copper-bearing Steel
Lustrous, silver white magnetic lightweight metal that is very malleable has good thermal and electrical conductivity
Aluminum
Pure Metal, Lustous Reddish Brown, highly ductile and malleable
Copper
Pure Metal, Soft Malleable, Heavy Metal, easy to cut and work, enable to fit under uneven surfaces
Lead
Pure Metal, substitute for lead flashing and lining
Zinc
Pure metal, Lustrous white, soft, malleable metal having low melting point unaffected by exposure to air
Tin
Two or more metal and other substances
Alloy
Copper + Tin
Bronze
Aluminun + Copper + Other metals
Duraluminum
Copper + Zinc
Brass
Slow hardening process, takes place in alloys
Age Hardening
Ability to break under sharp blow
Brittleness
Capacity to transmit heat and electricity
Conductivity
Ability to stretch into fine wire without fracture
Ductility
Ability to regain original shape after deformation
Elasticity
Property of becoming liquid when heated
Fusibility
Resistance to deformation
Hardness
Capacity to be extended in all directions without fracturing by rolling, hammering or beating
Malleability
Resistance to a pulling force
Tenacity and Cohesion
Hardening of Metal while its being hammered or bent
Work Hardening
Method in which coating is applied on metallic substrate, process includes cleaning and chemical pre treatment
Coating (Organic)
Three Types of Coating:
One side or Two side
Laminating with plastic films
Non-metallic coating
Non metallic coating:
Painting/Enameling
Lacquering
Plastic and Nylon Coating