Commonly used in chemistry labs and in analytics for organizing small samples or parts. Most are thin polystyrene that will melt at dry cure temperatures above 50ºC. I made this for ABS to see if it would work better and not melt when used for long dry cures. ****Disclaimer**** This may contaminate your test samples if used in a lab. The acid resistance of this material or any material has not been tested. This model is provided as is and the designer holds no responsibility if used in a lab or any where else. Use at your own risk. Two forms of the same model, one solid the other with voids to save material. Enjoy- Matt