Composites World / NetComposites

Connecting you to the composites industry

Advertisement

NetComposites Ltd has transferred the rights and ownership of this website to Gardner Business Media Inc.

On 1st January 2020, NetComposites' media assets including netcomposites.com, newsletters and conferences were transferred to Composites World (Gardner Business Media).

This site is no longer being updated. Please direct all enquiries to netcomposites@gardnerweb.com.

For further details see our joint press release.

Glossary



Vacuum Bag Moulding

A process in which a sheet of flexible transparent material plus bleeder cloth and release film are placed over the lay-up on the mould 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 moulding.


Vacuum-Assisted Resin Transfer Moulding (VARTM)

An infusion process where a vacuum draws resin into a one-sided mould. A cover, either rigid or flexible, is placed over the top to form a vacuum-tight seal.


Veil

An ultra thin mat similar to a surface mat, often composed of organic fibres as well as glass fibres.


Vent

A small hole or shallow channel in a mould that allows air or gas to exit as the moulding material enters.


Void

A physical and mechanical discontinuity occurring within a material or part which may be two-dimensional (e.g., disbonds, delaminations) or three-dimensional (e.g., vacuum-, air-, or gas-filled pockets). Porosity is an aggregation of micro-voids. Voids are essentially incapable of transmitting structural stresses or nonradiative energy fields. 


Void Content

Volume percentage of voids, usually less than 1% in a properly cured composite. The experimental determination is indirect, that is, calculated from the measured density of a cured laminate and the “theoretical” density of the starting material.


Volatiles

Materials, such as water and alcohol, in a sizing or a resin formulation, that are capable of being driven off as a vapour at room temperature or at a slightly elevated temperature.

Upcoming Events

Advertisement

Follow us