Shellac orange

Raw lac is first treated to remove water-soluble carbohydrates and the dye that gives lac its red color. Also removed are woody materials, insect bodies, and trash. It is further refined by either hot filtration or a solvent process. In the heat process, the dried, refined lac is filtered molten through cloth or wine screens to produce the standard grades of orange shellac. In the solvent process, lac is dissolved and refluxed in alcohol solvents, filtered to remove dirt and impurities, and concentrated by evaporation. The lac can be further decolori2ed in this process to produce very pale grades. Bleached shellac is prepared by treatment with dilute sodium hypochlorite and coalesced into slabs. 

Method No 217. Friction Composition for Blasting Fuse, Friction Type, M3A1. Accdg to PA-PD-2111D(1966), the mixture consists of Red Phosphorus and Orange Shellac (no percentages given)... 

Then the material is melted, strained and flaked, similarily as in procedures described in this Vol, p F44-L, under Flaking. This gives orange shellac of commerce. 

SHELLAC. A secretion or excretion of the lac insect, Coccus lacca, found in the forests of Assam and Siam. Freed from wood it is called seed lac." It is soluble in alkaline solutions such as ammonia, sodium borate, sodium carbonate and sodium hydroxide, and also in various organic chemicals. When dissolved in acetone or alcohol, shellac yields the familiar shellac varnish of superior gloss and hardness. Orange shellac is bleached with sodium hypochlorite solution to form white shellac. See also Paints and Coatings. 

Bleached shellac CertiSeal dewaxed orange shellac E904 lac Mantrolac R-49-, orange shellac refined bleached shellac regular bleached shellac Swanlac. 

The PhEur 2005 defines four types of shellac depending on the nature of the treatment of the crude shellac (seed lac) wax-containing shellac bleached shellac dewaxed shellac and bleached dewaxed shellac. The USPNF 23 similarly defines four types of shellac orange shellac dewaxed orange shellac regular bleached (white) shellac and refined bleached shellac. The JP 2001 defines two types purified shellac and white shellac (bleached). 

Various different grades of modified or refined shellac are available, which may be broadly defined as either bleached or orange shellac. Orange shellac is essentially the crude shellac obtained from seed lac, as described above. It may retain most of its wax or be dewaxed, and may contain less of the natural color than was originally present. The quantities of wax, coloring material, and other impurities present may vary the... 

Derivation A natural resin secreted by the insect Laccifer lacca (Coccus lacca) and deposited on the twigs of trees in India. After collection, washing, and purification by melting and filtering, it is formed into thin sheets, that are later fragmented into flakes of orange shellac. This may be dewaxed and bleached to a transparent product. Soluble in alcohol insoluble in water. 

Classification Specially denatured alcohol Definition Ethyl alcohol (100 gal) denatured with refined white or orange shellac (300 lb)... 

Flake shellac n. Orange shellac gum in flake form. 

Orange shellac n. A refined lac which is soluble in alcohol contains some wax and resin used as a coating on floors and other wood surfaces. 

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