An assembly of dry fabric and fibers which has been prepared for one of several different wet resin injection processes A preform may be stitched or stabilized in some other way to hold its shape A commingled preform may contain thermoplastic fibers and may be consolidated by elevated temperature and pressure without resin injection
the compressed cylinder of PTFE resin that is used to extrude into raw tubing Also called a billet
In plastics, a compressed table or biscuit of plastic composition used for efficiency in handling and accuracy in weighing materials Also an injection molded parison which is blow molded by a second step into a plastic bottle
An early stage in the manufacture of a flaked stone artifact usually with a roughly oval, elliptical or triangular outline Preforms which are roughly shaped, were intended to be finished at a later date into a point or blade In general, the preform was a finished "blank" that lacked only the knapping of the hafting area details for completion of the final implement
Compact mass of premixed plastic material that has been prepared for convenient handling and control of uniformity during the mold loading process