Machine Drawing

Annexure 447

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Table 9 Properties and uses of plastics

Tensile

Group Compound strength Typical uses

(Mpa)

Cellulosics Cellulose nitrate 50 Handles, piano keys, toilet seats, fountain

(Celluloid) pens, spectacle frames, instrument labels, etc.

Cellulose acetate 20–60 Photographic film, artificial leather, lamp shades,

(Tricel) toys, combs, cable covering, tool handles, etc.

Vinyls Polyvinyl chloride 50 Pipes, bottles, chemical plant, lighting fittings,

(Rigid PVC) curtain rails, cable covers, toys, balls, gloves,

(Plasticized PVC) etc.

Polypropylene 35 Pipes and fittings, bottles, crates, cable insulation,

tanks, cabinets for radios, shoe heels, pumps, etc.

Polystyrene 50 Vending machine cups, housings for cleaners and

cameras, radio cabinets, furniture, toys, etc.

Fluorocarbons Polytetrafluorethylene 21 Excellent Bearings, gaskets, valves, chemical plant,

(PTFE), (‘Teflon’, etc.) electrical-insulation tapes, non-stick coatings

for frying pans.

Polyamides Nylon 66 70 Bearings, gears, cams, pulleys, combs, bristles for

brushes, ropes, fishing lines, raincoats, containers.

Acrylics Polymethylmethacrylate 55–80 Lenses, aircraft glazing, windows, roof lighting,

(‘Perspex’, ‘Plexiglas’, etc.) sinks, baths, knobs, telephones, dentures,

machine guards.

Phenolics Phenol formaldehyde 50–60 Vaccum cleaners, ashtrays, buttons, cameras,

(‘Bakelite’, etc.) electrical equipment, dies, handles, gears,

costume jewellery.

Melamine and Urea 45–75 Electrical equipment, handles, cups, plates, trays,

formaldehyde radio cabinets, knobs, building panels, etc.

Epoxides Epoxy resins 60 Adhesives, surface coatings, flooring, electrical

(‘Bakelite’, ‘Araldite’, etc.) insulation, glass-fibre laminates, furniture, etc.

High-pressure Laminates (‘Tuflon’, 12–80 (Paper 1’s) electrical insulation, (Fabric 1’s) gears,

laminates ‘Formica’, etc.) bearings, jigs, aircraft parts, press tools,

(Decorative 1’s) table tops, trays.