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Fabric, Nonwoven
A material formed from fibers or yarns without interlacing (e.g., stitched bonded, nonwoven broadgoods).

Fabric, Woven
A material constructed of interlaced yarns, fibers or filaments produced by the weaving process.

The process of making a composite part or tool.

Feathered Edge
A fabric edge that tapers down in weight instead of abruptly ending.

A general term used to refer to filamentary materials. Often, fiber is used synonymously with filament.

Fiber Architecture
The design of a fibrous part in which the fibers are arranged in a particular way to achieve the desired result. This can include braided, stitched or woven fabrics, or mats, rovings or carbon tows.

Fiber Content
The amount of fiber present in a composite. This is usually expressed as a percentage volume fraction or weight fraction of the composite.

Fiber Diameter
A term used to denote the diameter of continuous glass filaments. Their diameter can vary depending on the purpose for which they are to be used. Can be expressed in letter designation, microns or inches.

Fiber Direction
The orientation or alignment of the longitudinal axis of the fiber with respect to a stated reference axis.

Fiber Glass
Primarily means glass in fiber form. However, "fiber glass" is also used to describe composite processing and applications. Examples of usage: fiber glass molding plant, fiber glass car.

Fiber Orientation
The fiber alignment in a nonwoven or a mat laminate in which most of the fibers are in the same direction, thereby affording higher strength in that direction.

Fiber Pattern
Visible fibers on the surface of laminates or moldings; the thread size and weave of glass cloth.

Fiber Prominence
The appearance of reinforcement fibers in the surface of a molded part. Can also be termed pattern print-through, strike-through or fiber pattern.

Fiber Reinforced Plastics (FRP)
A general term for composite materials or parts that consist of a resin matrix that contains reinforcing fibers such as glass or fiber and have greater strength or stiffness than the resin. FRP is most often used to denote glass fiber-reinforced plastics.

The smallest unit of a fibrous material. The basic units formed during drawing and spinning, which are gathered into strands of fiber for use in composites. Filaments usually are of extreme length and very small diameter, usually less than 25 micron. Normally filaments are not used individually. Some textile filaments can function as yarn when they are of sufficient strength and flexibility.

Filament Winding
A process for fabricating a composite structure in which continuous reinforcements (filament, wire, yarn, tape, or other), either previously impregnated with a matrix material or impregnated during the winding, are placed over a rotating and removable form.

A phenomenon in which a coated strand breaks up into loose individual filaments.

That part of a woven fabric in which the strands are perpendicular to the main direction of the fabric (warp), the strands running from selvage to selvage . Also called weft.
See also - Weft

A relatively inert substance added to a material to alter its physical, mechanical, thermal, electrical, and other properties or to lower cost or density. Sometimes the term is used specifically to mean particulate additives.

Film Adhesive
An adhesive in the form of a thin, dry, resin film with or without a carrier, commonly used for adhesion between layers of laminates.

Flame Retardants
Certain chemicals that are used to reduce or eliminate a resin's tendency to burn.

Excess material which forms at the parting line of a mold or die, or which is extruded from a closed mold.

The movement of resin under pressure, allowing it to fill all parts of a mold; flow or creep the gradual but continuous distortion of a material under continued load, usually at high temperature.

Flow Line
A mark on a molded piece made by the meeting of two flow fronts during molding. (Also, 'striae', or 'weld-mark,' or 'weld-line.')

Loose filaments of fiber that have broken from their parent strand during processing and are freely floating in the air.

Acronym for fiber glass-reinforced or fiber-reinforced plastic, polymer or polyester.

Detached and broken glass fiber that has collected on processing equipment.