DT - Polymers, Timbers & Metals

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List some surface finishes/treatments used for metals (+outline process)

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GCSE Design and Technology

AQA

Revision for term 2 dt test - year 10 Topics: polymers, metals, timbers, surface finishes, properties of materials, papers & boards, design communication

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List some surface finishes/treatments used for metals (+outline process)

Plastic dip coating - Metal is heated and dipped in powdered plastics for protection, insulation & adds a grip
Powder coating - Dry powder paint is sprayed onto metal after being electrically charged
Galvanising - Zinc is coated over steel products to protect from corrosion
Metal lacquer - A clear varnish-like finish, applied to metal to protect and create a sheen gloss or matt finish

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2

List some surface finishes/treatments used for polymers (+outline process)

Spray paint & primer - plastics are primed and sprayed for aesthetics and protection from UV degradation
Vinyl decals - Printed and self-adhesive decals can be attached to most surfaces
Heat transfer printing - Image is printed onto special paper and transferred onto the surface with a heat press
Polishing - Rubbing & applying a chemical treatment onto a polymer, leaving a clean surface

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3

List some surface finishes/treatments used for timbers (+outline process)

Painting - Liquid pigment used for aesthetics & resistance to dirt. Con: can appear dull shortly after applying. (reapply every 6-10 yrs)
Staining - Permanent colour for wood that acts as a sealant, making it waterproof & more natural looking. (reapply 2-3 yrs)
Varnishing - Glossy transparent film/protective coating that seals & protects wood. Con: yellows with age. (reapply 2-5 yrs)
Wax - finishing product that soaks into wood to protect it from absorbing moisture (reapply every year)
Oil - Oils penetrate surface of wood to replenish natural oils & buff away marks (reapply 3-6 months)