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By certification 
Features
*Ultimate in applications from sample storage in vapor phase liquid nitrogen to boiling applications
*Polypropylene material makes these screw cap tubes perfect for almost every long term storage application.
*Superior clarity and phenomenal strength
*Universal screw threads for use
*Tubes fit most common rotors
*Autoclavable to 121° C and freezable to 181° C
*Available in three sizes: 0.5ml, 1.5ml, and 2.0ml; And two formats: Self-standing and conical
*Tubes are screwed with caps and are gamma radiation sterilized
*Ultimate in applications from sample storage in vapor phase liquid nitrogen to boiling applications
*Polypropylene material makes these screw cap tubes perfect for almost every long term storage application.
*Superior clarity and phenomenal strength
*Universal screw threads for use
*Tubes fit most common rotors
*Autoclavable to 121° C and freezable to 181° C
*Available in three sizes: 0.5ml, 1.5ml, and 2.0ml; And two formats: Self-standing and conical
*Tubes are screwed with caps and are gamma radiation sterilized
