Difference between revisions of "Lac wax"
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cera de laca (Esp.); shellac wax; lacwax | cera de laca (Esp.); shellac wax; lacwax | ||
| − | == | + | == Risks == |
| − | + | * Combustible. | |
| + | == Physical and Chemical Properties == | ||
| − | + | * Iodine value=6.0-8.8 | |
| − | + | * Acid value=12.1-24.3 | |
| − | + | * Saponification value = 63.8-83.0 | |
| − | + | * Melting Point = 78-82 C | |
| − | + | * Density = 0.971-0.980 g/ml | |
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| − | |||
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| − | == | + | == Resources and Citations == |
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* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 | * R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966 | ||
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* John S. Mills, Raymond White, ''The Organic Chemistry of Museum Objects'', Butterworth Heineman, London, 2nd ed., 1994 | * John S. Mills, Raymond White, ''The Organic Chemistry of Museum Objects'', Butterworth Heineman, London, 2nd ed., 1994 | ||
| − | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "lac" | + | * ''Encyclopedia Britannica'', http://www.britannica.com Comment: "lac" [Accessed February 6, 2003]. gives 17th c. for first use in Europe |
* ''CRC Handbook of Chemistry and Physics'', Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: melting point = 79-82; density=0.971-0.980; iodine value=6.0-8.8, acid value=12.1-24.3; saponification value = 63.8-83.0 | * ''CRC Handbook of Chemistry and Physics'', Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: melting point = 79-82; density=0.971-0.980; iodine value=6.0-8.8, acid value=12.1-24.3; saponification value = 63.8-83.0 | ||
Latest revision as of 11:23, 6 October 2022
Description
A solid fatty acid ester compound obtained from Shellac resin. Shellac contains approximately 3-6% wax and is separated as a byproduct during shellac processing. Lac wax primarily contains myricyl and ceryl alcohols with a small proportion of heavier alcohols and some hydrocarbons ranging from C42 to C68. As early as the 17th century lac wac was imported to Europe and used as a sealing wax. The hard, golden-color wax is no longer commonly used. In shellac varnishes, the incomplete removeal of lac wax can produce a hazy appearance.
Synonyms and Related Terms
cera de laca (Esp.); shellac wax; lacwax
Risks
- Combustible.
Physical and Chemical Properties
- Iodine value=6.0-8.8
- Acid value=12.1-24.3
- Saponification value = 63.8-83.0
- Melting Point = 78-82 C
- Density = 0.971-0.980 g/ml
Resources and Citations
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
- Thomas Gregory, The Condensed Chemical Dictionary, Reinhold Publishing, New York, 3rd ed., 1942
- John S. Mills, Raymond White, The Organic Chemistry of Museum Objects, Butterworth Heineman, London, 2nd ed., 1994
- Encyclopedia Britannica, http://www.britannica.com Comment: "lac" [Accessed February 6, 2003]. gives 17th c. for first use in Europe
- CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: melting point = 79-82; density=0.971-0.980; iodine value=6.0-8.8, acid value=12.1-24.3; saponification value = 63.8-83.0