20 mL Vial & 30 mL Centrifuge Tube Screw Caps — HDPE, Pink, 1000/Bag (300-3532-P20)
These pink High-Density Polyethylene (HDPE) screw caps from Caplugs® Evergreen are designed to fit 20 mL screw-neck vials and 30 mL centrifuge tubes, supplying a secure threaded closure for clinical, biorepository, and centrifugation workflows. Part number 300-3532-P20 ships 1000 caps per bag and delivers IATA P650 compliant leak-free sealing, −80 °C cryogenic stability, and autoclave compatibility at 121 °C — making these caps suitable for the full specimen lifecycle from collection through frozen archive. The pink color is a recognized convention in pediatric specimen programs, enabling immediate visual differentiation of pediatric-derived tubes in multi-patient-type processing environments.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3532-P20 |
| Cap Type | Screw cap — threaded engagement |
| Material | High-Density Polyethylene (HDPE) |
| Color | Pink |
| Tube Compatibility | Caplugs® Evergreen 20 mL screw-neck vials; 30 mL centrifuge tubes |
| Thread Note | Larger thread than 300-3010/300-3022 family — not interchangeable |
| IATA P650 | Compliant — leak-free primary container seal |
| Cryogenic Storage | Compatible to −80 °C |
| Autoclave Compatibility | 121 °C / 15 psi |
| Sterility | Non-Sterile |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Pack Size | 1000/Bag |
| Country of Origin | USA (California) |
Applications
- Pediatric specimen programs: Pink cap convention enables immediate visual identification and routing of pediatric-derived tubes for age-appropriate reference range interpretation in multi-patient-type workflows.
- 20 mL vial capping: Threaded HDPE engagement provides a secure, leak-free closure on Caplugs® Evergreen 20 mL screw-neck vials for sample storage and transport.
- 30 mL centrifuge tube capping: Screw-thread design retains the cap through centrifuge forces while maintaining IATA P650 compliant leak-free integrity during transport.
- Biorepository and frozen archive: HDPE cryo stability to −80 °C supports long-term biorepository storage of clinical and research specimens.
- Color-coded batch routing: Pink caps integrate into multi-color specimen classification systems; the 300-3532 range offers 14 additional solid colors at identical thread specifications for a complete routing vocabulary.
- Replacement cap supply: Provides exact-thread replacement caps for existing Caplugs® Evergreen 20 mL and 30 mL tube inventories.
Compatibility
These caps are engineered to fit the Caplugs® Evergreen 20 mL screw-neck vial and 30 mL centrifuge tube families. It is important to note that the 300-3532 series uses a larger thread specification than the 300-3010 and 300-3022 cap families designed for 15 mL tubes — the two thread sizes are not interchangeable. Laboratories transitioning from a 15 mL format or evaluating a new color routing system should validate cap-to-tube thread fit with a sample quantity before placing a bulk order. An assorted-color pack (300-3532-X20) is available for color routing trials.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers and saline | Excellent |
| Dilute acids and bases | Excellent |
| Ethanol and isopropanol | Good — suitable for most lab concentrations |
| Chlorinated solvents (chloroform, DCM) | Not recommended |
| Aromatic solvents (toluene, xylene) | Not recommended |
| Cryogenic storage (−80 °C) | Compatible |
| Autoclave (121 °C / 15 psi) | Compatible |
Quality & Procurement
Made in USA at Caplugs® Evergreen's California manufacturing facility, these screw caps are produced from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. The IATA P650 compliant closure design meets international requirements for leak-free transport of primary containers, supporting clinical and biorepository programs that ship specimens between facilities. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with tiered volume pricing available for hospitals, research institutions, and biotech procurement teams managing high-throughput tube programs.
Frequently Asked Questions
Will these caps fit my existing 15 mL centrifuge tubes?
No. The 300-3532 series uses a larger thread specification than the 300-3010 and 300-3022 cap families designed for 15 mL tubes. These caps are intended exclusively for Caplugs® Evergreen 20 mL screw-neck vials and 30 mL centrifuge tubes. Confirm your tube format before ordering.
Are these caps sterile?
No — they are supplied non-sterile in 1000/Bag packaging. For workflows requiring sterile closures, contact your LabSupplies.com account representative to discuss available options.
Can these caps be autoclaved or used for frozen storage?
Yes on both counts. The HDPE construction is autoclave compatible at 121 °C / 15 psi and maintains cryogenic stability to −80 °C, making these caps suitable from initial specimen processing through long-term frozen biorepository archiving.
Why use a pink cap specifically?
Pink is a widely adopted color convention in clinical lab workflows to designate pediatric-derived specimens. Using a visually distinct cap color allows processing staff to immediately identify and route pediatric tubes for age-appropriate reference range interpretation without relying solely on labeling — reducing routing errors in high-volume multi-patient-type environments.