Glass Test Tube with Screw Cap, Test tubes that come with a Bakelite screw cap and rubber liner, Pack of 12

Details

Made of high quality, heavy duty Borosilicate 3.3 glassFitted with a Bakelite rubber-lined screw cap to ensure a leak proof sealLow temperature gradient, capable of withstanding high temperatures & thermal shocksSuperior chemical durabilityPlain, round bottom designAutoclavable