These cuvettes are made from a unique material that is resistant to aggressive solvents, acids, and bases including chemicals such as Acetone, butanone, DMF, and concentrated hydrochloric acid. Built for consistent performance, each cuvette is manufactured from the same mold to ensure the lowest variation in extinction coefficient. Cuvettes fit most commercial Spectrophotometers without requiring special adapters. Ultra-micro cuvettes require only 70 µl (up to 850µl) of sample volume. The Ultra-Micro cuvettes certified DNA-, DNase, RNase-Free for added protection. Round polyethylene caps (sold separately) provide a seal for reliable sample storage; Select from four colors. Save time and money - replace your quartz cuvettes with this disposable alternative! eliminate the Cross contamination, breakage, and washing involved with expensive quartz cuvettes better chemical resistance than PS or PMMA cuvettes fantastic for DNA, RNA and protein analyses from 220 to 900 nm.