Casein is a natural thermosetting material, the result of the rennet enzyme acting on skim milk.  The curds are cleaned and dried into a powder that is mixed with water into a dough which is then then extruded.  Formaldehyde is used to harden the material into a bonelike substance.



Celluloid is the name commonly applied to material made from Cellulose Nitrate compounded with a plasticizer, usually camphor.



Cellulose is derived from stems of plants and trees, especially cotton, and is used in the production of cellulosic plastics.  It is a carbohydrate polymer of high molecular weight comprised of long chains of D-glucose units joined together by beta-1,4-glucosidic bonds.


Cellulose Acetate Butyrate (CAB)

Cellulose Acetate Butyrate (CAB) is an ester of cellulose made by the action of a mixture of acetic and butyric acids, and their anhydrides on purified cellulose.  It is used in the manufacture of thermoplastics which are similar in general properties to cellulose acetate plastics but are tougher and have better moisture resistance and dimensional stability.


Cellulose Acetate (CA)

Cellulose acetate is the acetate ester of cellulose. It is a tough thermoplastic available in a full color range, including transparent.  For more than a century, cellulose acetate has been the most widely-used plastic derived from renewable resources.


Cellulose Acetate Propionate (CAP)

An ester of cellulose made by the action of propionic acid and its hydride on purified cellulose.  Similar to cellulose acetate butyrate, CP requires less plasticizer and is more compatible with more plasticizers.  Used as thermoplastics for making tough molded products such as frames for eyeglasses and goggles, toothbrush handles, pens, flashlight housings, cosmetic containers, and fuel filters.


Cellulose Nitrate (CN) (Celluloid)

The oldest synthetic plastic, Cellulose Nitrate was first prepared in 1833 by the French chemist Henri Bracconet, who mixed cellulose in the form of sawdust and linen with nitric acid.



A family of thermoplastics made by substituting various chemical groups for the hydroxyl groups in the cellulose molecules of cotton linters or wood pulp.


Chlorinated PE (CPE)

One of a family of resins obtained by polymerizing the gas ethylene. The first patent on the chlorination of polyethylene was taken out by Imperial Chemical Industries (ICI) in 1938.



A composite is any article or substance containing or made up of two or more different substances.


Cross-linked PE (XLPE)

One of a family of resins obtained by polymerizing the gas ethylene. Cross-linking refers to a process in which chemical links are set up between the molecular chains of a plastic.