The tubes are molded from premium grade polystyrene or polypropylene. Polypropylene offers clarity and the polypropylene offers impact strength and stability against common acids, alkalies and solvents. Polyethylene (PE) flanged plug caps provide exceptional leak-resistance. They feature two flexible flanges that press firmly against the inside wall of the tubes, thereby providing better leak-resistance than standard plug caps.
- Polystyrene tubes can withstand 1500 RPM
- Polypropylene tubes can withstand 3000 RPM
- PP is autolavable & freezable