Environmental Express. Designed to fit our SC150 HotBlock™ for 100mL samples, this 125mL volume wide-mouth digestion vessel is supplied with a 48mm screw cap. The SC490 digestion vessel is made of copolymer polypropylene. Vessels are graduated at 10mL, 25mL, 50mL, 75mL and 100mL. The cap is lined with coextruded.