Reinforced plastics prepreg molding

TPX Mitsui Petrochemical Industries, Ltd. s tradename for its family of polymethylpentene plastic, tracer A foreign substance, usually radioactive, that is mixed with or attached to plastic material so its distribution or location can later be determined. It is used as a trace chemical to determine behavior of the plastic melt flow through plasticators, molds, and dies. Also called a tracer element or accessory element. See reinforced-plastic prepreg tracer. 

This decay rate is nearly equivalent to that exhibited by one g of radium in equilibrium with its disintegration products. A miUicurie (mCi) is 0.001 curie, curie point See magnetized curie point, curing See autoclave nitrogen atmosphere cure extruder wire and cable process, dry cure inhibitor prepreg volatile content reinforced plastic resin transfer molding test, Barcol hardness test, scorch Mooney thermoset plastic vulcanization welding, induction. 

Preimpregnated materials usually are a compound of a reinforcement and a hot melt or solvent system. Prepreg also includes wet systems without solvent using TS polyester. They are stored for use at a latter time either in-house or to ship to a fabricator. The plastic is partially cured, B-stage, ready-to-mold material in web form that may have a substrate of glass fiber mat, fabric, roving, paper, cotton cloth, and so forth. With proper temperature storage conditions, their shelf life can be controlled to last at least 6 months. 

Sheet-Molding Compound n (SMC) A fiberglass-reinforced thermosetting compound in sheet form, usually rolled into coils interleaved with plastic film to prevent Autoadhesion. This term was chosen to replace the term Prepreg which was deemed to be confusing and insufficiently definitive. SMC can be molded into complex shapes with little scrap, and is low in cost. 

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