Your digestion tubes need to provide optimal heat transfer and digestion speed. Environmental Express digestion cups meet the performance of heavy-duty borosilicate glass, but are constructed from clarified homopolymer polypropylene, making them disposable. Designed for our HotBlock® systems, these cups eliminate the transfer step saving you time. They can also be used as a storage container. Either way you choose to use them, you get a reliable, leak-proof cup with low metals background that meet EPA method requirements. Choose from the Ultimate Cup™ and Ultimate Clean Cup in a variety of sizes, types, and cap colors.