Question 1

Are these tubes truly leak-proof and can they handle being frozen?

Accepted Answer

Based on extensive user feedback, the seal is highly reliable for standard use. Most customers report no leakage during normal storage, vortexing, and centrifugation. They are suitable for freezing and thawing cycles for samples like DNA or proteins. However, a very small number of users have noted occasional cap inconsistencies, so for absolutely critical, irreplaceable samples, a visual seal check is recommended.

Question 2

What is the maximum centrifugation speed (RPM/RCF) these tubes can handle?

Accepted Answer

These tubes are designed for general lab use. While many users successfully use them in standard microcentrifuges (typical max of 13,000-15,000 RPM), some experienced lab personnel note the plastic feels slightly more flexible than premium brands. For routine spins, they perform well. For sustained ultra-high-speed centrifugation (e.g., >18,000 RCF), users concerned about extreme durability often opt for specialized, branded tubes.

Question 3

Are these tubes DNase/RNase-free and how is the sterility guaranteed?

Accepted Answer

Yes, these tubes are EO (Ethylene Oxide) sterilized, a standard and effective method that renders them sterile, pyrogen-free, and DNase/RNase-free upon arrival. The sterile barrier packaging is sealed to maintain sterility until opened. They are ideal for PCR, molecular biology, and general sample storage where contamination control is important.

Question 4

Who are these tubes best suited for, and who might want to consider a more expensive alternative?

Accepted Answer

These tubes offer outstanding value and are perfect for students, teaching labs, startup budgets, and researchers conducting high-volume, routine work like sample aliquoting, PCR, or reagent storage. If your work involves ultra-high-speed spins, long-term storage of priceless single samples, or requires an etched writing surface, investing in a premium brand (like Eppendorf or Thermo) might be worth the extra cost for absolute peace of mind.

Question 5

Is this one pack of 100 tubes, or 100 packs? The title is a bit confusing.

Accepted Answer

This is for a single pack containing 100 microcentrifuge tubes. The "(100)" in the title indicates the quantity of tubes in the pack, not the number of packs. You will receive one bag or box of 100 sterile, 2ml tubes with caps.

2ml Microcentrifuge Tubes 100pcs, EO Sterilized Plastic Small Vials with Caps for Sample Storage Without Leakage(100)

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