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Due
to the versatility of lac resin, it finds innumerable uses both in
industries and domestic fields. On the stand point of industrial uses
of shellac one or more of the following properties are of great
importance:
-
Shellac
dissolves in a wide variety of alkaline or rapidly drying
alcoholic solvents but is resistant to a number of other
solvents particularly hydrocarbons.
-
Its
film shows excellent adhesion to a wide variety of surfaces,
possessing high gloss, hardness and strength.
-
Shellac
is powerful bonding material with low thermal conductivity and a
small coefficient of expansion. Its thermal plasticity and
capacity of absorbing large amounts of fillers are noteworthy.
-
Its
electrical properties include high dielectric strength, low
dielectric constant and characteristic freedom from tacking.
-
It
is resistant to the action of ultraviolet rays.
-
Shellac
is non-toxic
Some of the main uses of shellac in different fields are:
-
Surface
coating - As under coat, primer, sealer, French Polish, Leather
dressing, Fruit Coating etc.
-
Printing
- Flexographic ink, Waterproof ink, Photo engraving.
-
Textiles
- Stiffening of hats.
-
Cosmetic
& Pharmaceuticals - Hair lacquer, hair sprays (Pump sprays
or aerosol aprays with propan-butan or DME), hair setting
lotions, hair shampoos mascara, eyeliners, nail polishes,
lipsticks microencapsulation by coacervation of fragrances and
perfume oils, coating for Enteric pills,
Dental base place.
-
Food - Coating of
confections, chewing gum, candles, cakes, eggs, coating of
Citrus fruits and apples, printing inks for eggs and cheese.
-
Engineering
- Grinding wheels, Rivet & Plate sealer.
-
Electrical
- Micanite, Insulating Varnish.
-
Photography
- Dry mounting tissue paper, protective varnish.
-
Paper
- Paper varnish, playing cards.
-
Rubber
- Stiffening agent, surface finish.
-
Adhesive
- Gasket cement, sealing wax, pyrotechnic Optical Cement.
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