Industry Glossary - V

Process in which a sheet of flexible transparent material plus bleeder cloth and release film are placed over the lay-up on the mold and sealed at the edges. A vacuum is applied between the sheet and the lay-up. The entrapped air is mechanically worked out of the lay-up and removed by the vacuum, and the part is cured with temperature, pressure, and time. Also called bag molding.

Method of low cost entry into the RTM process through the use of rigid cavity mold half and a semi rigid upper mold have each made of FRP. Ability to produce moldings at rate of 3 to 4 that of open mold with acceptable repeatability but not equal to that of RTM. SeeVM within the site.

Ultra thin mat similar to a surface mat.

Continuous glass filament yarn, coated with a pigment and plasticized vinyl chloride resin.

Class of thermosetting resins containing esters of acrylic and/or methacrylic acids, many of which have been made from epoxy resin. Cure is accomplished as with unsaturated polyesters by CO-polymerization with other vinyl monomers, such as styrene.

A measure of the resistance of a liquid to flow.