Molded from thick polypropylene, these trays are ideal for school and industrial use. They"re chemical-resistant, incredibly durable, and their base ribbing ensures rigidity while preventing prints from sticking to the tray. The patented design keeps your thermometer from sliding into the solution, and every tray has an extra large pouring lip to minimize chemical splash. Base design gives maximum economy of solution and easy print removal; Pouring lip for drip-free emptying;