High quality screw cap sample tubes manufactured of translucent autoclavable polypropylene
Tube with internal threads
Caps are supplied with or without a silicone washer, to ensure a positive leakproof seal at all temperatures
A 11/4 turn of the cap is sufficient to seal the vial
Since both closures and tubes are manufactured of the same material, they have the same coefficient of expansion to guarantee an equally secure seal both at room or at low temperatures
Round bottom tubes only can be centrifuged up to 14,000g
