ఎలా ఉంది ఎపోక్సీ రెసిన్ బోర్డు తయారు చేయబడిందా?

Mainly made of epoxy resin, quartz sand, catalyst, curing agent and pigment, etc., after high-temperature baking, the entire thickness from top to bottom and from inside to outside is made of the same material, with a single core, strong stability and no external force. Break down.