20 mL Vial & 30 mL Centrifuge Tube Screw Caps — HDPE, Orange, 1000/Bag (300-3532-E20)
These orange High-Density Polyethylene screw caps from Caplugs® Evergreen are engineered to fit 20 mL screw-neck vials and 30 mL centrifuge tubes, providing a leak-free threaded closure for specimen transport, cryogenic archiving, and centrifugation workflows. Part number 300-3532-E20 belongs to the 15-color 300-3532 family, all sharing identical HDPE material and thread geometry — orange is the color designation for high-visibility STAT and priority routing in processing environments. Each bag contains 1,000 caps for high-volume clinical, biorepository, and field-collection programs.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3532-E20 |
| Cap Type | Screw cap — threaded engagement |
| Material | High-Density Polyethylene (HDPE) |
| Color | Orange |
| Tube Compatibility | Caplugs® Evergreen 20 mL screw-neck vials; 30 mL centrifuge tubes |
| Thread Note | Larger thread than 300-3010/300-3022 (15 mL cap family) — not interchangeable |
| IATA P650 Compliance | Yes — leak-free primary container seal |
| Cryogenic Storage | Compatible to −80°C |
| Autoclave Compatibility | Yes — 121°C / 15 psi |
| Sterility | Non-Sterile |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Pack Size | 1,000/Bag |
| Country of Origin | USA (California) |
Applications
- STAT and priority specimen routing: Orange caps are immediately identifiable in processing racks, enabling urgent accessioning without secondary label scanning.
- Biological specimen transport: IATA P650 compliant leak-free closure for safe shipment of 20 mL vials and 30 mL centrifuge tubes containing biological material.
- Biorepository cryogenic archiving: HDPE retains structural integrity at −80°C, making these caps suitable for ultra-low temperature storage of large-format tubes in long-term biobanking programs.
- Centrifugation: Threaded engagement holds securely through centrifuge forces during serum separation, cell pelleting, and related spin protocols in 30 mL tubes.
- Cell culture: HDPE is compatible with standard culture media formulations for large-volume incubation applications.
- Environmental and field sampling: Chemical inertness of HDPE makes these caps well suited for water, soil, and field-collection programs requiring a robust large-volume closure.
- Replacement cap programs: Serves as a direct replacement for lost or damaged caps on existing Caplugs® Evergreen 20 mL vial and 30 mL centrifuge tube inventories where the thread specification matches.
Compatibility
These screw caps are designed to fit Caplugs® Evergreen 20 mL screw-neck vials and 30 mL centrifuge tubes. The 300-3532 thread specification is larger than that of the 300-3010 and 300-3022 cap families used with 15 mL tubes — the two families are not interchangeable. Before placing a bulk order as a replacement cap, validate thread fit with a sample set against your existing tube inventory to confirm compatibility. All 15 colors in the 300-3532 range share the same HDPE formulation and thread geometry, so color is the only variable between SKUs.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Dilute acids and bases | Excellent |
| Alcohols (ethanol, isopropanol) | Good — suitable for most lab concentrations |
| Many organic solvents (general) | Good — HDPE offers broad organic resistance |
| Chlorinated solvents (e.g., chloroform) | Limited — verify before use |
| Aromatic solvents (e.g., toluene, xylene) | Limited — verify before use |
| Cryogenic storage (to −80°C) | Compatible |
| Autoclave (121°C / 15 psi) | Compatible |
Quality & Procurement
Made in USA at Caplugs® Evergreen's California manufacturing facility, these HDPE screw caps are produced from BPA-free, phthalate-free resin and are IATA P650 compliant for biological specimen transport. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with same-business-day dispatch available for stocking items. Tiered volume pricing is available for clinical laboratories, hospital networks, biorepositories, and grant-funded research institutions — contact our procurement team for institutional account setup.
Frequently Asked Questions
Will these caps fit my existing 15 mL centrifuge tubes?
No. The 300-3532 thread specification is larger than the thread used on the 300-3010 and 300-3022 cap families, which are designed for 15 mL tubes. These caps are sized for 20 mL screw-neck vials and 30 mL centrifuge tubes only. Always validate fit with a sample before committing to a bulk order.
Are these caps sterile?
No — they are supplied non-sterile in 1,000/Bag packaging. They are autoclavable at 121°C / 15 psi, so laboratory teams that require a sterile closure can process them in-house prior to use.
Why choose orange caps rather than a neutral color?
Orange provides an immediate visual cue in busy processing racks and sorting workflows. Laboratories that use a color-coded routing vocabulary can assign orange to STAT draws, a specific specimen type, or a priority accession group, reducing the need for secondary label scanning during high-throughput accessioning.
Are these caps compatible with ultra-low temperature freezer storage?
Yes. HDPE maintains structural integrity and thread engagement at −80°C, making these caps appropriate for biorepository programs that archive large-format 20 mL or 30 mL tubes at ultra-low temperature.