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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 heated enough, and are melt 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 not reversible. One created, the object can not be melted back, reshaped, nor recycled. | 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 heated enough, and are melt 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 not reversible. One created, the object can not be melted back, 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 | + | *[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 imputrescible 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. |
− | *Various usual plastics | + | *Various usual plastics now makes the scales of most entry-level razors made in the last decades. |
*[http://en.wikipedia.org/wiki/Bakelite Bakelite](commercial name for polyoxybenzylmethylenglycolanhydride) was popular in the first half of the 20th century. Like celluloid, it's one of the first plastics ever. This thermosetting polymer is produced from phenol and formaldehyde (both are basic products from the petrochemical industry), wood flour can be added as a filler. | *[http://en.wikipedia.org/wiki/Bakelite Bakelite](commercial name for polyoxybenzylmethylenglycolanhydride) was popular in the first half of the 20th century. Like celluloid, it's one of the first plastics ever. This thermosetting polymer is produced from phenol and formaldehyde (both are basic products from the petrochemical industry), wood flour can be added as a filler. | ||
*Rubber (natural or artificial) has also been used. | *Rubber (natural or artificial) has also been used. |