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Term |
Definition |
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Alpha-Cellulose
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A very pure cellulose prepared by special chemical treatment.
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Amber
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A chromatic (brown) color of glass or plastic containers. It is used principally to protect the contents of the container from exposure to light.
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Amino
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Indicates the presence of an -NH2 or -NH group.
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AMMA
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Acrylonitrile-methyl-meth-acrylate
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Amorphous
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Without (regular) form, glassy, noncrystalline, a condition of great disorder or absence of structure
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Amorphouse Phase
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Devoid of crystallinity - no definite order. At processing temperatures, the plastic is normally in the amorphous state.
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Angle Press
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A hydraulic moulding press equipped with horizontal and vertical rams, and specially designed for the production of complex mouldings containing deep undercuts.
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Aniline
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C6H5NH2. An important organic base made by reacting chlorobenzene with aqueous ammonia in the presence of a catalyst. It is used in the production of aniline formaldehyde resins, and in the manufacture of certain rubber accelerators and antioxidants.
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Aniline Formaldehyde Resins
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Members of the aminoplastics family made by the condensation of formaldehyde and aniline in an acid solution. The resins are thermoplastic and are used to a limited extent in the production of moulded and laminated insulating materials. Products made from these resins have high dielectric strength and good chemical resistance.
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Anisotropy
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Condition in which properties depend on direction (i.e., properties are different in different directions)
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Annealing
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A process of holding a material at a temperature near, but below, its melting point, the objective being to permit stress relaxation without distortion of shape. It is often used on moulded articles to relieve stresses set up by flow into the mould.
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Anticaking Agents
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These additives are used to prevent the adhesion of two touching layers of film during fabrication and storage.
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Antifogger
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An additive that prevents condensation of moisture on glass and other transparent materials, such as windshields or lenses.
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Antioxidant
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Substance which prevents or slows down oxidation of material exposed to air.
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Antiozonants
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These additives are are used to prevent the negative effects of oxygen and ozone on the resin materials.
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Antistatic Agent
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A chemical substance applied to the surface of a plastic article or incorporated in the plastic from which the article is made. The antistatic agent renders the surface of the plastic article less susceptible to the accumulation of electrostatic charges which attract and hold fine dirt or dust on the surface of the plastic article.
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Antistatic Agents
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Methods of minimising static electricity in plastics materials. Such agents are of two basic types: (1) metallic devices which come into contact with the plastics and conduct the static to earth. Such devices give complete neutralisation at the time, but because they do not modify the surface of the material it can become prone to further static during subsequent handling; (2) chemical additives which, mixed with the compound during processing, give a reasonable degree of protection to the finished products.
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Antistats
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The use of these additives will eliminate or lessen static electricity.
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API
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Addition-reaction polyimides
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Arc Resistance
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Time required for a given electrical current to render the surface of a material conductive because of carbonization by the arc flame.
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