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Screw-Cap Security for Samples That Can't Leak
When a snap cap isn't enough, whether you're freezing to −90 °C, boiling, autoclaving, or shipping samples across the country, ScrewSeal™ screw-cap microtubes lock your sample in. Every tube comes with an assembled cap and a silicone O-ring that holds a leak-proof seal across the full −90 °C to +121 °C range.
Molded from ultra-clear polypropylene, ScrewSeal™ tubes let you see pellets and volumes at a glance. They arrive sterile and certified RNase-, DNase-, and pyrogen-free, ready for molecular, clinical, and pharmaceutical work.
22,000 × g*
Max centrifugation
−90 to +121 °C
Leak-proof O-ring seal range
Sterile
RNase/DNase/pyrogen-free
Caps On
Assembled and ready to use
Why Labs Choose ScrewSeal™
Silicone O-Ring Seal
A positive, leak-proof seal time after time, even through freeze-thaw cycles.
Ultra-Clear Polypropylene
Easy sample and pellet visualization.
Loop-Cap Option
C3150-SL loop caps are easy to grip with gloves and can be tethered or labeled.
Self-Standing 2.0 mL
Skirted bottoms stand upright on the bench, no rack required.
Molded Graduations
2.0 mL formats have permanent molded graduations that won't rub off.
Individually Wrapped
C2231-W wraps each tube for single-use sterility in clinical and field work.
Light-Blocking Amber for Sensitive Samples
Light degrades more samples than most labs realize: fluorophores, vitamins, photosensitive drugs, and many reagents. The C2230-AM amber tube and cap block light while keeping the same O-ring seal and self-standing design.
Use amber for photosensitive compounds, fluorescent probes, and any sample stored outside a dark freezer.
Choose Your Format
1.5 mL Conical
Catalog No.: C3150-S (screw cap), C3150-SL (loop cap)
Best for: Freezer storage, spin-down, and sample transport
2.0 mL Self-Standing
Catalog No.: C2230 (clear), C2230-AM (amber)
Best for: Bench-top handling, boiling, and light-sensitive samples
2.0 mL Individually Wrapped
Catalog No.: C2231-W, 500/cs
Best for: Clinical collection and single-use sterility
Need More Options?
Looking for 0.5 mL formats, printed graduations, or loop caps on a 2.0 mL tube? See our ClearSeal™ Screw Cap Microtubes, packed in resealable bags of 50.
For everyday snap-cap work, the SureSeal S™ Sterile Microcentrifuge Tubes are the value choice.
Typical Applications
- Long-term −80 °C sample storage
- Boiling and heat-block incubation
- Autoclaving buffers and media aliquots
- Sample transport and shipping
- Clinical and diagnostic specimen storage
- Light-sensitive reagent storage (amber)
Tip for Leak-Free Freezing
Tighten caps firmly but don't over-torque. The O-ring does the sealing. Let samples reach room temperature before opening to avoid condensation getting pulled inside.
*Centrifugation rating refers to liquids with a specific gravity of 1.0, using appropriate rotors, cushions, and adapters.
Frequently Asked Questions
Are ScrewSeal™ tubes a good alternative to Sarstedt screw cap micro tubes?
For most freezing, boiling, and transport applications, yes. ScrewSeal™ tubes are sterile with assembled silicone O-ring caps, seal from −90 °C to +121 °C, and include amber and individually wrapped options. Confirm fit in your specific racks and rotor. Sarstedt is a trademark of its respective owner; Blue Tiger Scientific is not affiliated.
What temperature range can ScrewSeal™ tubes seal across?
The silicone O-ring provides a leak-proof seal from −90 °C to +121 °C.
How fast can ScrewSeal™ tubes be centrifuged?
Up to 22,000 × g for liquids with a specific gravity of 1.0, using appropriate rotors, cushions, and adapters.
Is there a light-blocking option?
Yes. The C2230-AM is a 2.0 mL self-standing tube with an amber tube and cap for light-sensitive samples.
Are the caps already on the tubes?
Yes. All ScrewSeal™ tubes come with caps assembled and are sterile, RNase-, DNase-, and pyrogen-free.
Are individually wrapped tubes available?
Yes. The C2231-W 2.0 mL tube is individually wrapped for single-use sterility, 500 per case.
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