For development purposes, we have several thicknesses of plaques containing TOPAS. If you are interested in getting more details on pricing and availability, contact me (
adam.barton@topas-us.com) with the desired grade, thickness, size, and quantity. I will then confirm our current inventory and quote pricing. Ideal for University work. Most of the plaques available are 0.25" or less thick. 4.0" discs can be made up to 0.5".