The flat, markable screw caps feature high precision threads that make them easy to open with one hand without compromising the 95kPa rated leak-proof seal. Max RCF: 20,000xg Temp Range: -80° - 120°C Material: Tube - Polypropylene, Cap: HDPE Leak-Proof: Up to 95kPa Latex, TE, BSE, Endotoxin Free Medical Grade PP conforms to FDA 21CFR Produced in Class 100,000 Clean Room