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 5 mm or less thick. 4.0" discs can be made up to 0.5".