{"product_id":"214-2309-030-round-bottom-test-tube-pp","title":"2–3 mL Test Tubes, Round Bottom, PP, Natural — 214-2309-030 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e2–3 mL Round Bottom Test Tubes, 12 × 50 mm — Polypropylene, Natural, 1000\/Bag\u003c\/h2\u003e\n\u003cp\u003eThese 3.4 mL polypropylene round bottom test tubes measure 12 × 50 mm and are designed for the full range of bench chemistry, sample preparation, and incubation workflows where polystyrene falls short. Supplied non-sterile in a convenient 1000\/Bag format, part number 214-2309-030 is the preferred choice when organic solvents, elevated temperatures, or wide pH ranges make PS tubes unsuitable. The 12 × 50 mm format provides a wider bore for easy pipette access and accommodates standard round-bottom tube racks, centrifuge adapters, and dry-block inserts.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003e214-2309-030\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e3.4 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e12 × 50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGeometry\u003c\/td\u003e\n\u003ctd\u003eRound Bottom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePolypropylene (PP)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eNatural\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSterility\u003c\/td\u003e\n\u003ctd\u003eNon-Sterile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003e1000\/Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBPA \/ Phthalate \/ Latex\u003c\/td\u003e\n\u003ctd\u003eBPA-Free, Phthalate-Free, Latex-Free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUSA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOrganic solvent reactions and co-solvent incubations with acetonitrile or methanol — protocols where polystyrene tubes are not appropriate\u003c\/li\u003e\n\u003cli\u003eSPE eluate collection under solid-phase extraction columns or manifolds handling ACN and methanol fractions\u003c\/li\u003e\n\u003cli\u003eWater bath and dry-block incubation up to 80°C, leveraging PP's higher thermal tolerance compared to PS\u003c\/li\u003e\n\u003cli\u003eEnzyme kinetics assays that incorporate organic co-solvents in the buffer system\u003c\/li\u003e\n\u003cli\u003eSerial dilutions of solvent-containing samples in dilution racks, manual or automated\u003c\/li\u003e\n\u003cli\u003eColorimetric assays and spectrophotometric readings in the 400–700 nm range, where PP optical clarity is sufficient\u003c\/li\u003e\n\u003cli\u003eCentrifugation for round-bottom pellet formation in standard 12 × 50 mm centrifuge adapters\u003c\/li\u003e\n\u003cli\u003ePharmaceutical method development and sample preparation workflows requiring broad solvent compatibility\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eChemical Resistance\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eReagent \/ Condition\u003c\/th\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAqueous buffers \/ saline\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute acids and bases (wide pH range)\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcetonitrile (ACN), full concentration\u003c\/td\u003e\n\u003ctd\u003eGood — compatible for typical lab exposures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMethanol (MeOH), full concentration\u003c\/td\u003e\n\u003ctd\u003eGood — compatible for typical lab exposures\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthanol (all concentrations)\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrganic extraction solvents (SPE eluates)\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConcentrated chlorinated or aromatic solvents\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eQuality \u0026amp; Procurement\u003c\/h2\u003e\n\u003cp\u003eMade in USA from FDA-compliant, food-contact-grade polypropylene resin, these tubes are produced under ISO 9001 quality management and are BPA-free, phthalate-free, and latex-free. LabSupplies.com is an authorized dealer of Caplugs® Evergreen consumables and ships from USA inventory, typically the same business day for stocking items. Volume pricing is available for laboratories purchasing ten or more bags, making these tubes cost-effective for high-throughput sample preparation and method development programs.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan these tubes be used with acetonitrile or methanol?\u003c\/strong\u003e\u003cbr\u003eYes — polypropylene provides broad organic solvent compatibility, including full-concentration acetonitrile and methanol. This makes these tubes well suited for SPE eluate collection, organic co-solvent reactions, and pharmaceutical method development workflows where polystyrene tubes would be degraded or compromised.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum temperature for these tubes?\u003c\/strong\u003e\u003cbr\u003ePolypropylene is thermally stable for water bath and dry-block incubation up to 80°C, which exceeds the approximately 60°C practical limit of polystyrene. They should not be autoclaved for sterile applications, as sterilization validation data is not provided for this product.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these tubes sterile?\u003c\/strong\u003e\u003cbr\u003eNo — they are supplied non-sterile in 1000\/Bag packaging. For workflows requiring sterile consumables, verify whether sterilization is needed before purchase.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs there a polystyrene version of this tube available?\u003c\/strong\u003e\u003cbr\u003eYes. If your protocols are limited to aqueous samples and standard buffers, a polystyrene round bottom tube in the same 3.4 mL, 12 × 50 mm format is available from the Caplugs® Evergreen family. Ask your LabSupplies.com representative for the PS equivalent when placing your order.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"2–3 mL Round Bottom Test Tubes, 12 × 50 mm, Polypropylene, Natural, 1000\/Bag\",\"sku\":\"2142309030E1\",\"mpn\":\"214-2309-030\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polypropylene (PP)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"59.60\",\"availability\":\"https:\/\/schema.org\/InStock\"}}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Can these tubes be used with acetonitrile or methanol?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — polypropylene provides broad organic solvent compatibility, including full-concentration acetonitrile and methanol. 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