50 mL Centrifuge Tube Screw Caps — HDPE, White, 1000/Bag (Falcon® Compatible, 300-3541-W20)
These white High-Density Polyethylene (HDPE) screw caps are designed for 50 mL centrifuge tubes and supplied in convenient 1000/Bag quantities for high-throughput clinical and research environments. The white surface delivers the highest-contrast background for adhesive and printed barcode labels, making these caps the preferred choice for biorepository, genomics, and LIS-driven specimen-routing programs where label readability on archived 50 mL tubes is paramount. Each cap provides a leak-free threaded closure rated for IATA P650 transport, -80°C cryogenic storage, and autoclave sterilization at 121°C.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3541-W20 |
| Cap Type | Screw cap — threaded engagement |
| Material | High-Density Polyethylene (HDPE) |
| Color | White |
| Tube Compatibility | Caplugs® Evergreen 50 mL centrifuge tubes |
| Thread Note | 50 mL thread only — larger than 300-3532 (20/30 mL) and 300-3010/300-3022 (15 mL); not interchangeable |
| IATA P650 | Yes — leak-free primary container seal |
| Cryogenic Storage | Compatible to -80°C |
| Autoclave Compatibility | 121°C / 15 psi |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| BPA / Phthalates | BPA-free; phthalate-free |
| Country of Origin | USA (California) |
Applications
- Capping 50 mL centrifuge tubes for large-volume serum, plasma, and urine specimen transport under IATA P650 requirements
- Biorepository and biobank archiving of 50 mL tubes at -80°C ultra-low temperature
- Color-coded batch routing across clinical departments — white maximizes barcode label readability for LIS-generated tube labels
- Capped centrifugation for plasma or cell-culture harvest in 50 mL format
- High-volume DNA/RNA extraction prep and genomics banking in 50 mL tubes
- Autoclaving capped tubes at 121°C for sterile media or buffer preparation workflows
Compatibility
These caps are designed to fit Caplugs® Evergreen 50 mL centrifuge tubes, which share thread geometry with standard 50 mL conical tube formats including Falcon® 50 mL tubes. The 300-3541 thread is specific to the 50 mL tube neck and is intentionally larger than both the 300-3532 cap family (20/30 mL tubes) and the 300-3010/300-3022 cap family (15 mL tubes) — the three families are not interchangeable. If you are transitioning from OEM caps, validate fit with a sample lot before committing to bulk purchase. The same HDPE thread specification is shared across all nine colors in the 300-3541 range, so labs running multi-color routing schemes can stock multiple colors with confidence in uniform fit.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers and saline | Excellent |
| Dilute acids and bases | Excellent |
| Alcohols (ethanol, isopropanol) | Good — suitable for short-term contact |
| Many organic solvents (non-aromatic, non-chlorinated) | Good |
| Aromatic solvents (toluene, xylene) | Not recommended |
| Chlorinated solvents (chloroform, DCM) | Not recommended |
| Cryogenic storage (-80°C) | Compatible |
| Autoclave (121°C / 15 psi) | Compatible |
Quality & Procurement
Made in USA at Caplugs® Evergreen's California facility, these caps are produced from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from USA inventory, enabling same-business-day dispatch on stocking items. Volume and institutional pricing tiers are available for hospitals, biorepositories, and grant-funded research programs — contact our sales team for a quote on multi-bag or contract orders.
Frequently Asked Questions
Will these caps fit my existing Falcon® 50 mL centrifuge tubes?
These caps are designed to fit Caplugs® Evergreen 50 mL centrifuge tubes, which share thread geometry with standard 50 mL conical formats such as Falcon® tubes. Because minor thread tolerances can vary between manufacturers, we recommend validating fit with a sample before switching from OEM caps in bulk workflows.
Can these caps be autoclaved?
Yes. The HDPE construction is compatible with standard autoclave cycles at 121°C and 15 psi, making these caps suitable for sterile media preparation and other workflows requiring heat sterilization.
Why choose white caps over other available colors?
White provides the highest-contrast surface for adhesive and printed barcode labels, which is why biorepository, genomics, and LIS-driven programs often prefer it for 50 mL tube archives where label readability is critical. The 300-3541 range is also available in eight additional colors — including Natural, Blue, Orange, and Green — if your lab uses color coding for specimen-type or department routing.
Are these caps compatible with the 15 mL and 20/30 mL cap families?
No. The 300-3541 thread is sized specifically for 50 mL tube necks and is larger than both the 300-3532 family (20/30 mL) and the 300-3010/300-3022 family (15 mL). These three cap families are not interchangeable, so verify you are ordering the correct format for your tube size.