Industry Glossary - Y

Similar to Yield, but used to describe the linear density of “bare glass” or an unsized product. Yardage specifies the number of yards of glass required to weigh one pound. It is measured in hundreds. For example, K18 is a K fiber diameter that has 1800 yards in one pound of glass.

A generic term for a continuous strand of textile fibers, filaments, or material in a form suitable for knitting, weaving, or otherwise intertwining to form a textile fabric.

Yield refers to the linear density of a roving or yarn and is measured as the number of yards per pound.

First stress in a material, less than the maximum attainable stress, at which the strain increases at a higher rate than the stress. The point at which permanent deformation of a stressed specimen begins to take place. Only materials that exhibit yielding have a yield point.

Stress at the yield point. The stress at which a material exhibits a specified limiting deviation from the proportionality of stress to strain. The lowest stress at which a material undergoes plastic deformation. Below this stress, the material is elastic; above it, the material is viscous. Often defined as the stress needed to produce a specified amount of plastic deformation (usually a 0.2% change in length).

Ratio of normal stress to corresponding strain for tensile or compressive stresses less than the proportional limit of the material.