Difference between revisions of "Lac wax"

Latest revision as of 10:23, 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

@@ Line 1: / Line 1: @@
 == Description ==
-A solid fatty acid ester compound obtained from [http://cameo.mfa.org/materials/fullrecord.asp?name=shellac 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.
+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 ==
@@ Line 7: / Line 7: @@
 cera de laca (Esp.); shellac wax; lacwax
-== Other Properties ==
+== Risks ==
-Iodine value=6.0-8.8, acid value=12.1-24.3; saponification value = 63.8-83.0
+* Combustible.
+== Physical and Chemical Properties ==
-{| class="wikitable"
+* Iodine value=6.0-8.8
-|-
+* Acid value=12.1-24.3
-! scope="row"| Melting Point
+* Saponification value = 63.8-83.0
-| 78-82
+* Melting Point = 78-82 C
-|-
+* Density = 0.971-0.980 g/ml
-! scope="row"| Density
-| 0.971-0.980
-|}
-== Hazards and Safety ==
+== Resources and Citations ==
-Combustible.
+* R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966
-== Authority ==
+* Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942
-* R. J. Gettens, G.L. Stout, R. J. Gettens, G.L. Stout, ''Painting Materials, A Short Encyclopaedia'', Dover Publications, New York, 1966
+* John S. Mills, Raymond White, ''The Organic Chemistry of Museum Objects'', Butterworth Heineman, London, 2nd ed., 1994
-* Thomas Gregory, Thomas Gregory, ''The Condensed Chemical Dictionary'', Reinhold Publishing, New York, 3rd ed., 1942
+* ''Encyclopedia Britannica'', http://www.britannica.com  Comment: "lac" [Accessed February 6, 2003]. gives 17th c. for first use in Europe
-* John S. Mills, Raymond White, 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" Encyclopdia Britannica from Encyclopdia Britannica Premium Service. [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