Types of backing
Consists of fibreglass and polyresin which is black in colour and opaque. This is basically used on any panel for decoration purposes and affixed with the help of resin.
This backing is made of a different resin which is clear and transparent in nature. These panels are usually with some backlit light. As they are transparent in colour it can be used as a backlit panel where veins of the stone can be seen.
This is a slightly improved version of poly backing. A bit more expensive and little more flexible than usual poly backing. Other characteristics are the same as poly backing.