http://www.ebay.com/usr/ckresale offers the following:
What is Chipboard? Chipboard is cardboard that is not corrugated. It is not particle board or made of wood chips in any way, instead made of recycled paper which is pressed into a paperboard. Though it does have a grain like wood, with one direction being more sturdy then the other, it is not wood. Cereal boxes, tissue boxes, fruit snack boxes, etc are all made of chipboard. Chipboard comes in two colors, Kraft and News. Kraft is brown and News is Grey. If you look inside your cereal boxes you can compare the colors.
There are many thicknesses of chipboard. The higher the number the thicker the chipboard is. A cereal box thickness is .022. you can find chipboard from .012 to .120+. Some of the thicker chipboard is often referred to as book board, davey board, or pasted board.
If you have no idea what thickness you need, samples are available. http://www.ebay.com/usr/ckresale
