Heathrow Scientific 1.5mL Black Microcentrifuge Tubes - HS4323K - DNase/RNase-Free, Pack of 500

Light-sensitive samples — fluorescently labeled antibodies, photodegradable reagents, RNA extracts — degrade silently in standard clear tubes. By the time you see the data artifact, the experiment is ruined. The Heathrow Scientific HS4323K 1.5 mL Black Microcentrifuge Tube is engineered specifically to prevent this. The opaque black polypropylene body blocks light from all angles, protecting photo-sensitive samples throughout handling, centrifugation, and storage — without requiring foil wrapping or darkroom protocols.

Certified DNase, RNase, and Pyrogen free, these tubes are ready for molecular biology, genomics, and proteomics workflows. The attached flat snap cap opens one-handed and is syringe-pierceable for direct sampling without opening the tube. Graduated markings at 0.1, 0.5, 1.0, and 1.5 mL provide visual volume confirmation. Rated to 18,000 × g for high-speed microcentrifuge applications. Sold in a pack of 500.

Features and Benefits

• Opaque Black Body Blocks Light: Protects fluorescent dyes, photodegradable reagents, and light-sensitive biological samples during handling and storage — no foil wrapping required.

• Certified DNase, RNase, and Pyrogen Free: Each lot is certified free of nuclease and pyrogen contamination — critical for RNA isolation, gene expression, and cell-based assays.

• 18,000 × g Rated: Withstands high-speed microcentrifuge applications — suitable for cell pelleting, protein precipitation, and nucleic acid extraction protocols requiring maximum RCF.

• Attached Flat Snap Cap - One-Handed Operation: Integrated cap opens and closes with one hand — speeds up workflows and prevents cap loss during high-throughput sample processing.

• Syringe-Pierceable Cap: Allows direct syringe access without opening the tube — maintains sample integrity and reduces aerosol exposure risk during liquid transfers.

• Graduated at 0.1, 0.5, 1.0, 1.5 mL: Clear volume markings on the tube body for rapid visual volume confirmation without transferring to a separate vessel.

• Autoclavable Polypropylene - Pack of 500: Can be autoclaved for pre-sterilization, reducing per-tube cost versus purchasing pre-sterilized alternatives. Each order contains 500 tubes.

Specifications

Laboratory Applications

• Storage and handling of fluorescently labeled antibodies, probes, and dyes where light exposure causes photobleaching or signal degradation

• RNA extraction and storage — DNase/RNase-free certification combined with light protection supports full RNA integrity from lysis through downstream assay

• High-speed cell pelleting and protein precipitation at up to 18,000 × g in standard bench-top microcentrifuges

• Long-term cryogenic storage of photosensitive samples at -80°C — polypropylene remains dimensionally stable at ultra-low temperatures

• Chemiluminescence and bioluminescence assays where ambient light must be completely excluded from reagent preparation and reaction tubes

Frequently Asked Questions

How much light do the black tubes actually block?
The opaque black polypropylene body blocks visible light across the full spectrum and provides significant UV attenuation. For critical photosensitive applications, these tubes eliminate the need for foil wrapping during typical benchtop handling — though for prolonged ambient exposure, storing tubes in a drawer or covered rack is still recommended.

Are the HS4323K tubes compatible with standard 1.5 mL tube racks?
Yes. The HS4323K tubes have the same outer diameter as standard 1.5 mL microcentrifuge tubes and fit all standard 1.5/2.0 mL tube racks, including floating racks, reversible racks, and benchtop microtube racks.

What does "Pack of 500" mean — is this one bag or multiple smaller packs?
Each order contains 500 individual 1.5 mL black microcentrifuge tubes in bulk packaging. This pack size is designed for high-volume laboratory consumption, offering a lower per-tube cost than smaller pack quantities.

Can I autoclave these tubes before use?
Yes. Polypropylene is autoclavable at 121°C for standard sterilization cycles. Note that autoclaving may affect the graduation markings on some tubes — verify readability after sterilization if precise volume markings are critical to your protocol.

Quality Assurance

Heathrow Scientific HS4323K microcentrifuge tubes are lot-certified DNase-free, RNase-free, and Pyrogen-free. Manufactured from virgin polypropylene and tested to confirm 18,000 × g structural integrity. Country of origin: Taiwan.

Academic and Institutional Pricing

LabSupplies.com offers tiered quantity pricing for academic and research institutions. As an authorized dealer, we ship directly from USA inventory.