{"product_id":"214-2301-030-round-bottom-test-tube-pp","title":"0.5–1.6 mL Test Tubes, Round Bottom, PP, Natural — 214-2301-030 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e0.5–1.6 mL Round Bottom Test Tubes, 8 × 50 mm — Polypropylene, Natural, 1000\/Bag (214-2301-030)\u003c\/h2\u003e\n\u003cp\u003eThese 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.\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\u003e214-2301-030\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e1.6 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e8 × 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 (translucent)\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\u003e\n\u003cstrong\u003eOrganic solvent reactions:\u003c\/strong\u003e PP's broad solvent tolerance makes these tubes suitable for bench reactions containing acetonitrile or methanol co-solvents where PS would be incompatible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSPE eluate collection:\u003c\/strong\u003e Collect acetonitrile and methanol eluates directly from solid-phase extraction columns or manifolds without risk of tube degradation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater bath and dry-block incubation:\u003c\/strong\u003e PP is rated for incubation up to 80 °C, exceeding the typical 60 °C limit of polystyrene tubes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnzyme kinetics with organic co-solvents:\u003c\/strong\u003e The 1.6 mL working volume accommodates micro-scale kinetic assays in mixed aqueous–organic buffer systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial dilutions:\u003c\/strong\u003e Well-suited for dilution series involving solvent-containing matrices where PS tubes are unsuitable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColorimetric assays:\u003c\/strong\u003e PP's optical clarity is adequate for direct visual monitoring and spectrophotometric reading in the 400–700 nm range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugation:\u003c\/strong\u003e The round bottom geometry promotes clean pellet formation, and PP withstands the forces of standard clinical centrifuge runs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePharmaceutical method development:\u003c\/strong\u003e The combination of solvent resistance, thermal stability, and micro-scale volume makes these tubes a practical fit for early-stage analytical method work.\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)\u003c\/td\u003e\n\u003ctd\u003eGood — compatible at typical laboratory concentrations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMethanol \/ Ethanol\u003c\/td\u003e\n\u003ctd\u003eGood — compatible at typical laboratory concentrations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsopropanol (IPA)\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents (e.g., chloroform, DCM)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic solvents (e.g., toluene, xylene)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcetone\u003c\/td\u003e\n\u003ctd\u003eLimited — avoid prolonged exposure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater bath \/ dry-block heat (up to 80 °C)\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave\u003c\/td\u003e\n\u003ctd\u003eGenerally compatible — verify cycle conditions\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 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.\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 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.\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 sterility, additional decontamination steps appropriate to your protocol should be applied.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum temperature these tubes can handle?\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 limit of polystyrene round bottom tubes in the same format.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs there a polystyrene version of this tube available for standard aqueous protocols?\u003c\/strong\u003e\u003cbr\u003eYes. 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.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"0.5–1.6 mL Round Bottom Test Tubes, 8 × 50 mm, Polypropylene, Natural, 1000\/Bag\",\"sku\":\"2142301030E1\",\"mpn\":\"214-2301-030\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polypropylene (PP)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"58.87\",\"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. 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