15 mL Centrifuge Tube Screw Caps — Sterile Blue HDPE, 1000/Bag (222-3010-B2N)
These sterile blue High-Density Polyethylene screw caps are designed for Caplugs® Evergreen transport vials and 15 mL centrifuge tubes, supplied in bulk 1000/Bag packaging for high-volume clinical and research workflows. The blue color enables immediate visual identification of tube contents, collection time points, or patient cohorts without any additional labeling step — a widely adopted practice in specimen processing. Manufactured from BPA-free, phthalate-free HDPE, they provide a leak-resistant threaded seal and broad chemical compatibility across aqueous and clinical matrices.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 222-3010-B2N |
| Product Type | Screw Cap for Transport Vials / 15 mL Centrifuge Tubes |
| Material | High-Density Polyethylene (HDPE) |
| Color | Blue |
| Sterility | Sterile |
| Pack Size | 1000/Bag |
| BPA / Phthalate / Latex | BPA-Free, Phthalate-Free, Latex-Free |
| Country of Origin | USA |
Applications
- Color-coded specimen identification: Blue caps visually distinguish tube contents, patient cohorts, or collection conditions in multi-tube clinical workflows without additional labels.
- Transport vial capping: Drop-in sterile cap for Caplugs® Evergreen transport vials (222-3005, 222-3007, 222-3010 series), providing a leak-resistant threaded seal for specimen transport.
- 15 mL conical tube capping: Compatible with standard 15 mL centrifuge tubes for use in biosafety cabinets where rapid visual tube differentiation is required.
- Time-point and shift marking: Assign blue caps to a specific collection shift or time point within a run to eliminate confusion when multiple batches are processed simultaneously.
- Replacement cap supply: The 1000/Bag format provides an economical source of sterile replacement caps for existing tubes with lost or damaged closures.
Compatibility
These caps are compatible with Caplugs® Evergreen transport vials and 15 mL conical centrifuge tubes that share the same thread specification, including the 222-3005, 222-3007, and 222-3010 tube series. They are dimensionally and materially identical to the Natural cap (222-3010-02N) and the Green cap (222-3010-G2N) — the only difference among these SKUs is cap color, which is used purely for visual identification. Laboratories stocking multiple cap colors can therefore use the same tube inventory while differentiating workflows by cap color alone.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent — HDPE inert across pH 2–12 |
| Serum / plasma / urine | Excellent — standard clinical matrix; low extractables |
| Transport media (UTM / VTM) | Excellent — compatible with standard transport media |
| Boric acid preservative | Excellent — compatible with standard urine transport preservatives |
| Dilute HCl / H₂SO₄ (<10%) | Excellent — compatible with acid preservatives |
| Methanol / ethanol (<50%) | Good — short-term contact only |
| Cold storage (2–8 °C) | Excellent — standard refrigerator and ice-pack transport |
| Dichloromethane | Not compatible — causes swelling; do not use |
Quality & Procurement
Made in USA, these Caplugs® Evergreen screw caps are produced from FDA-compliant, BPA-free, phthalate-free, and latex-free HDPE resin. Each cap is sterile, supporting direct use in clinical specimen collection and processing without additional decontamination steps. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, typically the same business day for stocking items, with tiered pricing available for high-volume institutional and clinical laboratory accounts.
Frequently Asked Questions
Are these caps sterile out of the bag?
Yes — the 222-3010-B2N caps are supplied sterile and are ready for direct use in specimen collection and clinical processing workflows without any additional treatment.
What tubes do these caps fit?
They are designed for Caplugs® Evergreen transport vials and 15 mL centrifuge tubes in the 222-3005, 222-3007, and 222-3010 series. They share the same thread specification as the Natural (222-3010-02N) and Green (222-3010-G2N) caps, so they are interchangeable in terms of fit — only the color differs.
Is there a functional difference between the blue and natural caps?
No. The blue cap is materially and dimensionally identical to the Natural cap (222-3010-02N); the blue color serves exclusively as a visual identification aid for color-coded tube workflows.
Can these caps be used with urine transport preservatives such as boric acid?
Yes. HDPE is fully compatible with boric acid and other common urine transport preservatives, as well as standard viral and universal transport media (VTM/UTM).