Manufactured with durable plastic, these Nalgene products offer the highest quality material for dependable performance. Plastic offers a safer alternative to glass, won't break or or shatter. All items are chemically compatible with a wide range of common laboratory reagents; especially acids, bases and alcohols. Graduated Cylinders Meet CFR 21, Part 177.1520, ASTM* E 1272 Class B accuracy requirements and ISO Standard 6706. Beakers meet ISO/DIN 7056 International Standards for Laboratory Plasticware Accuracy. To autoclave jar; remove jar closure prior to autoclaving.