The cloth or fiber material used, resin material, and the cloth to resin ratio determine the laminate's type designation (FR-4, CEM-1, G-10, etc.) and therefore the characteristics of the laminate produced. Important characteristics are the level to which the laminate is fire retardant, the dielectric constant (er), the loss factor (tδ), the tensile strength, the shear strength, the glass transition temperature (Tg), and the Z-axis expansion coefficient (how much the thickness changes with temperature). COUNT 3
QSN1 What element of a laminate is designated by the cloth to resin ratio, among other things? ANS1 type designation QSN2 What's the name for the measurement of a laminate's change in thickness as its temperature changes? ANS2 Z-axis expansion coefficient QSN3 What's the abbreviation for the glass transition temperature of a laminate? ANS3 Tg