Prevent leakage under demanding conditions with Thermo Scientific™ screw cap microcentrifuge tube caps feature O-rings to form a secure seal. Optimised for secure, short-term storage in low temperatures, these non-autoclavable screw caps are available in a variety of colours and adapted to your scientific experiments.

• Free of RNase/DNase, human and mouse DNA, pyrogen, endotoxin, ATP, PCR inhibitor
• 100% virgin polypropylene resin specifically selected for high clarity and biologic applications
• O-ring design, thickness and material selection have been optimized to provide protective features for maximum sealing ability, biologic interaction and temperature capability, the black coloured O-ring is made from EPDM
• Coloured caps offered in multiple colour options ideal for separating, coding and tracking samples, amber coloured caps are ideal for UV protection of 1.22% transmittance between 220 and 500nm
• Tethered caps remain attached to the sample tube but can rotate completely for convenience - the tethered screw cap is the solution when it is important to maintain the same cap with the same tube
• RCF range from 18000 to 25000 x g
• Temperature range -80 to +95°C
• Short term storage in -80°C, -20°C, dry ice and wet ice.
• Short term storage in vapor phase LN₂ and suitable for a quick dip flash freeze in LN₂
• Torque manual/hand torque: standard: 0.125 lbsf.in to 2.5 lbsf.in; Metric: 1.412 Ncm to 28.24 Ncm
• Torque automated/robotic torque standard: 1.312 lbsf.in to 2.5 lbsf.in; Metric: 14.83 Ncm to 28.24 Ncm