Woven Glass Fibre Cloth, Style 112: Plain Weave of E-glass Yarn

Thin glass cloth is the skeleton of resin laminates. This is Type I (commercial style 112) of the US standard MIL-C-9084C (1970): a plain weave of E-glass yarn ECD 450-1/2 both ways, at least 39 by 38 yarns per inch, 0.0030–0.0050 in thick, 38 in wide. Woven, it is greige cloth; its finish must make it bond to the resin it goes into (epoxy for Class 2). The picture: two plain-woven glass fabrics, 220 and 550 g/m², heavier than style 112 (Cjp24, Wikimedia Commons, public domain).