The Diamond RealSeal™ Difference Medical grade resins to meet demanding requirements Precision molded for consistent wall thickness and smooth surfaces Leakproof, linerless caps for secure closing Value Safety & convenience Narrow mouth bottles improve pouring of liquid contents making them perfect for storing an shipping liquids Suitable for autoclaving at 121ºC Improved chemical resistance and clarity Resistant to most corrosives and suitable for a wide variety of laboratory uses Apprived for use from -40 to 121ºC