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Term |
Definition |
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DAP
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Diallyl phthalate
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Dash-pot
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A device used in hydraulic systems for damping down vibration. It consists of a piston attached to the part to be damped and fitted into a vessel containing fluid or air. It absorbs shocks by reducing the rate of change in the momentum of moving parts of machinery.
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Daylight Opening
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Clearance between two platens of a press in the open position.
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Debossed
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An indent or cut in design or lettering of a surface.
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Deckle Rod
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A small rod, or similar device, inserted at each end of the extrusion coating die which is used to adjust the length of the die opening.
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Decomposition Product
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The constituent elements or simpler compounds formed when a substance decays or decomposes.
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Decomposition Temperature
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The temperature (Td) at which a material is destroyed by chemical decomposition
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Decorative Sheet
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A laminated plastics sheet used for decorative purposes in which the color and/or surface pattern is an integral part of the sheet.
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Deflashing
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Covers the range of finishing techniques used to remove the flash (excess, unwanted material) on a plastic moulding.
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Deflection Temperature (1)
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The measurement of temperature at which a specimen deflects 0.01 inches under a load of 66 lb/in2.
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Deflection Temperature (2)
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The measure of temperature at which a specimen deflects 0.01 inches under a load of 264 lb/in2.
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Degassing
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See 'Breathing'
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Degradation
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A deleterious change in the chemical structure of a plastic.
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Degree of Polymerization (DP)
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The number of structural units or mers in the average polymer molecule in a particular sample. In most plastics the DP must reach several thousand if worthwhile physical properties are to be had.
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Delamination
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(1) The separation of the layers in a laminate caused by the failure of the adhesive (2) Detachment of the fibres from the matrix, or a crack in the matrix running parallel to a laminate layer
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Deliquescent
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Capable of attracting moisture from the air.
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Denier
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The weight (in grams) of 9000 meters of synthetic fiber in the form of continuous filament.
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Density
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Weight per unit volume of a substance, expressed in grams per cubic centimeter, pounds per cubic foot, etc.
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Desiccant
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Substance which can be used for drying purposes because of its affinity for water.
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Design Basis
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Term used for long term strength of plastic pipe determined in accordance with ASTM D2837.
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What does that mean?!