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Dewaxed Bleached Shellac
Dewaxed white shellac is used the same way
as you would any other grade of shellac. The major difference
between this shellac and the others is that it is a bit
harder, shines a bit brighter, is completely free from wax.
Bleached shellac is non-toxic, edible and used widely
in different indutries including Food, food packaging and
allied industries. Bleached lac has super characteristics and
qualities i.e. adhesive, binding, hardening, gloss, odorless.
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Fast drying, extending shelf life. And most
clear, transparent or very light coloured Alkali solutions can
be obtained from it. Bleached shellac is available in two
grades: waxy and dewaxed bleached shellac. |
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Process
of Bleached Shellac
The basic procedure in the
bleached process consists in dissolving lac in acqueous sodium
carbonate solution at 90-100 degree celcius, stirring off the
dissolved materials and treating the solution withsodium
hydrochloride solution and the start filteration after cooling
down the temprature of solution. The bleached lac is reclaimed
from the filtered solution with sulphuric acid. The
percipiated bleached lac is then filtered and washed from
water for removal of acid and dried.
The dewaxed
bleached shellac powder is approved by fda department of usa
for application in food and pharmaceutical products and
conform to specification according to usp-21 nf 18.
Packing : 25 kgs packed in 5 ply craft paper bags.
Storage: Must be stored below 10 degree celcius in cool
and dark place.
Industrial uses of Dewaxed Bleached
Shellac:
- Coating of fruits and vegetables
- Coating in tablets & capsules
- Coating in confectionary
- Coating in aluminium foil, paper
- Coating in cosmetic industry
Bleached shellac is
also widely used in the following industry:
- Paints (primer for plastic parts and plastic film)
- Aluminium industry (primer for aluminium and aluminium
foils)
- Flexographic and roto gravure printing inks
- Pharmaceuticals (for coating of pills, tables and gel
caps, making barrier coat for Vitamins, coating for
controlled release preparation)
- Confectionery (in coating of confections, chewing gums,
marzipan chocolates, nutties, jelly beans etc)
- Coating of coffee beans
- Binder for food marking inks and stamping inks
- Binder for egg coating
- Barrier coating for processed food
- Vegetable/food coating of oranges, lemons, apples,
avocados, plants tomatoes, dry flowers etc.
- In textiles --used in textile auxilliaries, felt hat
stiffening agents)
- Cosmetics--hair spray, hair lacquers, hair sampoos
- Binder for mascara
- Additive for nail lacquers
- Wood finishing; binder for wood coatings and wood stains
- Filter/sealer for porous surfaces and cracks
- Antique frames for paintings
- Wood polish (french polish)
- Textile- textile auxiliaries Adhesives- (additive to
special adhesives)
- Fire works and pyrotechnics-- (binder for fireworks,
matches etc and used in coating of magnesia
- Electric (it is binder for lamp cements).
- Electronics (it is binder for insulation materials,
serves as additive to moulding compounds. Mass coating for
print-plates and is adhesive for si-cells.)
- Grinding wheels (it is binder for additive of grinding
wheels)
- Plastic (it is primer for plastic parts and films)
- Rubber (it is additive to natural rubber and sbr)
- Leather (in leather auxiliaries)
- Seeds coatings
- Fertilizers coatings
The coating performs one or more of the
following functions:
Enhances and protects the gloss,
serves as a barrier to moisure either entering or leaving the
confection, prevents blocking together, extends shelf like :
Specification of Dewaxed Bleached
Shellac
| Acid Value |
65-90 |
| Ester Value |
135-195 |
| Saponification Value |
200-260 |
| Melting Point (Capillary Method) |
75ºC-91ºC |
| Wax Content: |
0 .20% max. |
| Moisture: |
6% max. |
| Insolubility in Hot Alcohol |
0.10% max. |
| Rosin Content |
Nil |
| Ash Content |
0.50% max. |
| Heavy Metals |
10 PPM |
| Colour |
Pale Yellow |
| Arsenic |
Nil |
| Iron |
Nil |
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