4.5 mL Conical Bottom Centrifuge Tubes — PP, Natural, 12 × 75 mm (214-2355-030) | 250/Bag
These 4.5 mL conical bottom test tubes measure 12 × 75 mm and are molded from virgin-grade polypropylene (PP) in a natural (translucent) finish, supplied non-sterile in sealed 250/Bag packaging. The conical bottom geometry concentrates centrifuged pellets at the tube tip for complete aspirate recovery with minimal disturbance, making them well suited for clinical hematology, urinalysis sediment analysis, toxicology sample preparation, and general centrifuge pelleting workflows. Lot-to-lot dimensional consistency ensures reliable fit in standard 12 mm clinical centrifuge tube holders.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 214-2355-030 |
| Volume | 4.5 mL |
| Dimensions | 12 × 75 mm |
| Bottom Style | Conical |
| Material | Polypropylene (PP) |
| Color | Natural (translucent) |
| Sterility | Non-Sterile |
| Pack Size | 250/Bag |
| BPA / Phthalate Free | Yes |
| Country of Origin | USA |
Applications
- Clinical hematology — differential and cell-count sample preparation using conical pellet concentration
- Urinalysis — sediment analysis where the conical geometry ensures complete pellet collection after spin-down
- Toxicology sample preparation — clean phase separation in aqueous and dilute reagent matrices
- General centrifuge pelleting — any workflow requiring reliable pellet recovery in a standard 12 mm tube holder
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Dilute acids | Excellent |
| Dilute bases | Excellent |
| Methanol | Good |
| Isopropanol | Good |
| Acetonitrile | Good |
| Aromatic / chlorinated solvents | Not recommended |
Quality & Procurement
Made in USA, these Caplugs® Evergreen conical bottom tubes are produced at ISO-certified manufacturing facilities from virgin-grade, FDA 21 CFR Part 177–compliant polypropylene resin that is BPA-free and phthalate-free — suitable for direct contact with serum, plasma, urine, and standard clinical reagent matrices. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from USA inventory.
Frequently Asked Questions
Are these centrifuge tubes sterile?
No — the 214-2355-030 tubes are supplied non-sterile. For workflows requiring sterile consumables, a separate sterile-grade product should be selected.
What centrifuge tube holders or racks are these compatible with?
The 12 × 75 mm outer dimensions are compatible with standard 12 mm clinical centrifuge tube holders and matching 12 × 75 mm tube racks commonly found in hematology and urinalysis laboratories.
Are these tubes autoclavable?
Polypropylene has inherent autoclave tolerance; however, autoclaving is only advisable if your specific workflow requires it. Because these tubes are sold non-sterile and are intended for single use, autoclaving is not a standard recommended practice for this product.
