Basic Civil & Mechanical Engineering: UNIT II: q. Modern materials
Electric, thermal and sound insulating materials
Civil Engineering Materials
Insulating materials used for electric, thermal and sound resistance are described below.
ELECTRIC, THERMAL AND SOUND INSULATING MATERIALS
Insulating
materials used for electric, thermal and sound resistance are described below.
1. ELECTRIC INSULATORS
Electrical
insulators are used to separate the conductors carrying electric current. They
are non-metallic materials having high resistance to current flow. Mica,
asbestos, porcelain, bakelite, rubber and wax are solid insulators for making
switches and switch plates. Paraffin oil and chlorinated diphenyl liquid are
liquid insulators used in transformers and rheostats.
Thermocol
is a cellular plastic which is an excellent electric insulator. It is a very
light, stable and durable material. It is used in refrigerators, air
conditioners and cold storages.
2. THERMAL INSULATORS
Air
conditioning of rooms consumes considerable amount of electricity. The load on
electricity can be considerably reduced by using thermal insulators. Thermal
insulation may be achieved by providing air spaces between structural
components or surface insulation. Aerated concrete and hollow bricks belong to
the first category of thermal insulation. Gypsum boards, fibre boards, asbestos
cement boards and reflecting paints act as surface insulators.
3. SOUND INSULATORS
Sound
insulation is required in buildings to restrict noise levels. In auditoriums
and cinema halls, sound insulation is a must. Apart from acoustic efficiency, a
sound insulating material should possess resistance to moisture. It should be
incombustible, light in weight and possess aesthetic appearance. Its
maintenance cost should be less.
The
commonly used sound insulating materials are concrete, asbestos, glass and
mineral wool. Gypsum plaster is a very good sound insulator.
Basic Civil & Mechanical Engineering: UNIT II: q. Modern materials : Tag: : Civil Engineering Materials - Electric, thermal and sound insulating materials
Basic Civil & Mechanical Engineering: UNIT II: q. Modern materials
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Basic Civil and Mechanical Engineering
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