The PVC Expansion Sheet does not contain any additives, which may help it prevent the linear expansion of the board and the underlying molecules from applying heat to the board. Therefore, as long as heat affects the molecules, the long-chain molecules will expand themselves. The extension may be very quiet and may make the board use dangerous. On the other hand, the composite board is composed of wood flooring and plastic and has certain additives to prevent expansion. Therefore, they retain their length and structure even in the presence of heat and warmth for a long time.

PVC foam board and composite board have almost no similarities, and there are many differences. They are all synthetic materials made of plastic. As the name suggests, PVC or polyvinyl chloride is used to make PVC foam boards. On the other hand, composite panels contain different kinds of plastics (possibly including polyethylene or polypropylene) as well as wood flour or bamboo flour. Composite boards containing wood flour are also called Wood Grain Boards.

Wood Grain Board has greater flexibility and can be easily bent, routed, and torn apart, making it particularly suitable for the contours of any space. On the other hand, you can't route wires on the edge of the PVC board, and even more, tools are needed to make any modifications. Therefore, if you want the board to fit perfectly in the available space, you need to use a composite board.