MoldPro MP-108 Digestion Tubes are certified to class A volume accuracy, include a metals background report and are compatible with leading brand graphite block digestion systems. • 500 vessels/case • Made from virgin polypropylene homopolymer (PP-H) • Excellent visibility • Very good resistance to acids • Molded-in graduations are in 5 mL increments to 50 mL. • Each shipment comes with a certificate of volume accuracy stating the tubes meet Class A tolerance at all graduation lines • Total capacity of 68 mL • Extremely low leachable metal content; each shipment comes with a metals background report • Fit leading brand graphite digestion block systems • Can be used as a digestion vessel, graduated cylinder, volumetric flask, autosampler tube, or storage container • Screw caps are available in blue, white, grey and natural • We also offer reflux caps (Item MP-112) and ribbed watch glasses (Item MP-121)