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=== Plastics and elastomers === | === Plastics and elastomers === | ||
− | Plastics are artificial polymers. They are generally classified between thermoplastics and thermosetting plastics. Thermoplastics, such as [http://en.wikipedia.org/wiki/epoxy epoxy], turns liquid when | + | Plastics are artificial polymers. They are generally classified between thermoplastics and thermosetting plastics. Thermoplastics, such as [http://en.wikipedia.org/wiki/epoxy epoxy], turns liquid when heating enough, and are heating to mold a desired object. Thermosetting plastics, such as [http://en.wikipedia.org/wiki/polyethylene polyethylene], [http://en.wikipedia.org/wiki/Polyvinyl_chloride PVC], [http://en.wikipedia.org/wiki/polypropylene polypropylene], or [http://en.wikipedia.org/wiki/Bakelite Bakelite], are made from two or more reactants, which are heated to provoke the polymerization. Thus, it's the heating that created the plastic, and this process is no reversible. One created, the object can not be melted, reshaped, nor recycled. |
*[http://en.wikipedia.org/wiki/Celluloid Celluloid] was historically the first thermoplastic ever, developed as a substitute for ivory (and still sold as faux ivory now). Made from a chemical reaction between cellulose (cotton, paper...) and nitric acid, made decay-proof by the addition of formol, it could be called a bioplastic. It's extremely flammable. Relatively few new straight razors use celluloid scales, except as faux ivory or faux nacre. However, regarding vintage razors, celluloid scales are usual, and sometimes decorated with elaborated reliefs. | *[http://en.wikipedia.org/wiki/Celluloid Celluloid] was historically the first thermoplastic ever, developed as a substitute for ivory (and still sold as faux ivory now). Made from a chemical reaction between cellulose (cotton, paper...) and nitric acid, made decay-proof by the addition of formol, it could be called a bioplastic. It's extremely flammable. Relatively few new straight razors use celluloid scales, except as faux ivory or faux nacre. However, regarding vintage razors, celluloid scales are usual, and sometimes decorated with elaborated reliefs. |