Just rite 12937 Poly Carboy, 40L, 3in Sanitary Neck, These polypropylene carboys feature large handles and base with molded grip allowing you to easily lift and pour. The material type and volume are printed on the outside of the carboy along with large, easy-to-read metric graduation marks that are certified to ±5% accuracy. Constructed from USP Class VI, FDA grade polypropylene resin, the translucent carboys provide good chemical compatibility when using with various reagents, buffers, and powders. Recommended autoclave cycle: 15 PSI and 250 Degrees Fahrenheit for 20 minutes.