Living With Shellac Coatings

Kerria lacca
Photo: Jeffrey W. Lotz

Shellac is a product made from secretions of the lac insect, Kerria lacca. Chemically, shellac is a terpenic acid attached to a hydroxy acid. These shellac “units” (monomers) can spontaneously form polymers in solution. Polymerization of shellac monomers turns a “soft form” of shellac into a z’hard form” resin. Polymerization creates problems for applications such as pharmaceutical manufacture that require a uniform coating. What is a drug…

Source: Living With Insects Blog

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