8.0 mL Round Bottom Test Tubes, 13 × 100 mm — Polypropylene, Natural, 1000/Bag (214-2313-030)
These 8.0 mL polypropylene round-bottom test tubes measure 13 × 100 mm — the clinical-standard tube format — and are supplied non-sterile in bulk (1000/Bag) for high-throughput lab work. Made in USA from FDA-compliant, BPA-free PP resin, part number 214-2313-030 extends the chemistry of the familiar 13 × 100 mm format beyond what polystyrene can handle, offering full compatibility with acetonitrile, methanol, and organic extraction solvents where PS tubes would fail. The natural (translucent) color allows direct visual monitoring and adequate optical clarity for spectrophotometric reading across the visible range.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 214-2313-030 |
| Capacity | 8.0 mL |
| Dimensions | 13 × 100 mm |
| Geometry | Round Bottom |
| Material | Polypropylene (PP) |
| Color | Natural (translucent) |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| BPA / Phthalate / Latex | BPA-Free, Phthalate-Free, Latex-Free |
| Country of Origin | USA |
Applications
- Organic solvent reactions: Full compatibility with acetonitrile and methanol co-solvent systems makes these tubes the preferred choice when PS tubes are not appropriate for the reagent in use.
- SPE eluate collection: Polypropylene withstands ACN and methanol eluates from solid-phase extraction columns and manifolds without tube degradation or analyte contamination.
- Water bath and dry-block incubation: PP is thermally stable up to 80°C, exceeding the ~60°C limit of PS, enabling higher-temperature enzyme kinetics and reaction incubations.
- Colorimetric and spectrophotometric assays: The natural translucent PP provides adequate optical clarity for absorbance readings in the 400–700 nm visible range.
- Serial dilutions with organic-containing buffers: The 8.0 mL volume and round-bottom geometry accommodate solvent-containing dilution series in standard 13 × 100 mm racks.
- Centrifugation: Round-bottom geometry promotes clean pellet formation; PP withstands the centrifugal forces generated in standard clinical centrifuges fitted with 13 × 100 mm adapters.
- Pharmaceutical method development: Compatibility with organic extraction solvents and dilute acids and bases across a broad pH range supports HPLC and mass-spectrometry sample preparation workflows.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers and saline | Excellent |
| Dilute acids and bases (broad pH range) | Excellent |
| Acetonitrile (ACN) | Excellent |
| Methanol (MeOH) | Excellent |
| Ethanol (≤70%) | Good — short-term contact |
| Organic extraction solvents (SPE eluates) | Good — verify concentration and exposure time |
| Chlorinated solvents (chloroform, DCM) | Not recommended |
| Aromatic solvents (toluene, xylene) | Not recommended |
| Thermal stability (water bath / dry block) | Up to 80°C |
Quality & Procurement
Made in USA, these Caplugs® Evergreen tubes are produced from FDA-compliant, food-contact-grade polypropylene resin under ISO 9001 quality management and are certified BPA-free, phthalate-free, and latex-free. LabSupplies.com is an authorized dealer of Caplugs® Evergreen consumables and ships from USA inventory, typically same business day for stocking items. Volume pricing is available for institutional purchasers, grant-funded laboratories, and procurement offices placing multi-bag orders.
Frequently Asked Questions
Why choose PP round-bottom tubes instead of PS for the 13 × 100 mm format?
Polystyrene is adequate for standard aqueous protocols, but it is incompatible with acetone, acetonitrile, methanol, alcohols above 70%, and most aromatic or chlorinated solvents. Polypropylene handles the full range of common organic solvents used in SPE, enzyme kinetics, and pharmaceutical method development, making these tubes the right choice whenever organic solvents or elevated temperatures are part of the workflow.
Can these tubes be used in a centrifuge?
Yes. The round-bottom geometry promotes clean pellet formation, and polypropylene provides sufficient mechanical strength to withstand the centrifugal forces generated in standard clinical centrifuges equipped with 13 × 100 mm tube adapters.
Are these tubes sterile?
No — they are supplied non-sterile in 1000/Bag bulk packaging, which is appropriate for the chemical, analytical, and clinical chemistry workflows they are designed to support. If sterility is required for your application, please contact us to discuss available options.
What is the maximum temperature these tubes can withstand?
Polypropylene is thermally stable up to approximately 80°C, making these tubes suitable for water bath and dry-block incubations that would deform or release contaminants from polystyrene tubes, which are typically limited to around 60°C.