0.5–1.6 mL Round Bottom Test Tubes, 8 × 50 mm — Polypropylene, Natural, 1000/Bag (214-2301-030)
These 1.6 mL polypropylene round bottom test tubes measure 8 × 50 mm and are supplied non-sterile in bags of 1000, making them an economical choice for high-throughput micro-scale workflows. The polypropylene construction extends solvent compatibility well beyond what a standard polystyrene tube can offer, accommodating acetonitrile, methanol, dilute acids and bases, and organic extraction solvents used in SPE, enzyme kinetics, and pharmaceutical method development. Part number 214-2301-030 is the PP entry in Caplugs® Evergreen's round bottom family — ideal whenever solvent tolerance, wider pH range, or elevated incubation temperature rules out a PS alternative.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 214-2301-030 |
| Capacity | 1.6 mL |
| Dimensions | 8 × 50 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: PP's broad solvent tolerance makes these tubes suitable for bench reactions containing acetonitrile or methanol co-solvents where PS would be incompatible.
- SPE eluate collection: Collect acetonitrile and methanol eluates directly from solid-phase extraction columns or manifolds without risk of tube degradation.
- Water bath and dry-block incubation: PP is rated for incubation up to 80 °C, exceeding the typical 60 °C limit of polystyrene tubes.
- Enzyme kinetics with organic co-solvents: The 1.6 mL working volume accommodates micro-scale kinetic assays in mixed aqueous–organic buffer systems.
- Serial dilutions: Well-suited for dilution series involving solvent-containing matrices where PS tubes are unsuitable.
- Colorimetric assays: PP's optical clarity is adequate for direct visual monitoring and spectrophotometric reading in the 400–700 nm range.
- Centrifugation: The round bottom geometry promotes clean pellet formation, and PP withstands the forces of standard clinical centrifuge runs.
- Pharmaceutical method development: The combination of solvent resistance, thermal stability, and micro-scale volume makes these tubes a practical fit for early-stage analytical method work.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Dilute acids and bases (wide pH range) | Excellent |
| Acetonitrile (ACN) | Good — compatible at typical laboratory concentrations |
| Methanol / Ethanol | Good — compatible at typical laboratory concentrations |
| Isopropanol (IPA) | Good — short-term contact |
| Chlorinated solvents (e.g., chloroform, DCM) | Not recommended |
| Aromatic solvents (e.g., toluene, xylene) | Not recommended |
| Acetone | Limited — avoid prolonged exposure |
| Water bath / dry-block heat (up to 80 °C) | Compatible |
| Autoclave | Generally compatible — verify cycle conditions |
Quality & Procurement
Made in USA from FDA-compliant, food-contact-grade polypropylene resin, these tubes are BPA-free, phthalate-free, and latex-free — meeting the material safety expectations of clinical, pharmaceutical, and research procurement teams. Caplugs® Evergreen consumables are produced under ISO 9001 quality management, and LabSupplies.com is an authorized dealer shipping from USA inventory, typically the same business day for stocking items. Volume pricing is available for institutional and grant-funded laboratories purchasing ten or more bags.
Frequently Asked Questions
Can these tubes be used with acetonitrile or methanol?
Yes. Polypropylene offers good compatibility with acetonitrile and methanol at typical laboratory concentrations, making these tubes a reliable choice for SPE eluate collection and organic co-solvent reaction protocols where polystyrene tubes are not suitable.
Are these tubes sterile?
No — they are supplied non-sterile in 1000/Bag packaging. For workflows requiring sterility, additional decontamination steps appropriate to your protocol should be applied.
What is the maximum temperature these tubes can handle?
Polypropylene is thermally stable for water bath and dry-block incubation up to 80 °C, which exceeds the approximately 60 °C limit of polystyrene round bottom tubes in the same format.
Is there a polystyrene version of this tube available for standard aqueous protocols?
Yes. Caplugs® Evergreen offers a 1.6 mL, 8 × 50 mm round bottom tube in polystyrene (natural) for aqueous-only workflows. Ask your LabSupplies.com representative about the PS sibling SKU if solvent resistance is not a requirement for your application.