Tubes feature molded graduations (tube 06334-40 has printed graduations) and are autoclavable. Max RCF for PPCO and PC is 6000 x g; PMP is 3000 x g; PS is 1800 x g; PTFE is 30,000 x g in a close fitting holder. Tubes 06334-11 and -21 accept closure 06336-00. Tubes 06334-40 and -45 include leakproof PE caps; -45 features skirted base. PTFE tubes are available with or without screw caps.