{"product_id":"214-2345-03n-round-bottom-test-tube-pp","title":"10–19 mL Test Tubes, Round Bottom, Borosilicate Glass, Natural — 214-2345-03N | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e19 mL Round-Bottom PP Test Tubes, 16 × 125 mm — Natural, Non-Sterile, 1000\/Bag (214-2345-03N)\u003c\/h2\u003e\n\u003cp\u003eThese 19 mL polypropylene round-bottom test tubes measure 16 × 125 mm and are supplied non-sterile in bulk (1000\/Bag) for high-throughput laboratory workflows. Manufactured from BPA-free, FDA-compliant polypropylene, they deliver broader solvent compatibility and higher thermal stability than polystyrene equivalents, making them the preferred choice for organic-modifier reaction systems, SPE eluate collection, and enzyme kinetics assays that exceed the chemical limits of PS tubes. Part number 214-2345-03N is available through LabSupplies.com, an authorized Caplugs® Evergreen dealer shipping from USA stock.\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\u003e214-2345-03N\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e19 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e16 × 125 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\u003eThermal Rating\u003c\/td\u003e\n\u003ctd\u003eUp to ~80°C\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\u003eSPE eluate collection:\u003c\/strong\u003e Full compatibility with acetonitrile and methanol eluents at the 10–19 mL collection scale under standard SPE manifolds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrganic solvent reactions:\u003c\/strong\u003e Bench-scale reactions and incubations with organic co-solvent buffer systems that are incompatible with polystyrene tubes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnzyme kinetics:\u003c\/strong\u003e Water bath incubation up to ~80°C with organic modifier co-solvents; exceeds the ~60°C thermal limit of PS equivalents\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReagent and calibrator preparation:\u003c\/strong\u003e Multi-day storage of broad-solvent reagent matrices at the 19 mL working volume\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColorimetric assays:\u003c\/strong\u003e Adequate PP optical clarity supports visual monitoring and spectrophotometric reading in the 400–700 nm range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugation:\u003c\/strong\u003e Round-bottom geometry seats correctly in standard 16 × 125 mm clinical centrifuge adapters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePharmaceutical method development:\u003c\/strong\u003e Protocols requiring expanded acid\/base tolerance (pH 2–12) and organic-modifier compatibility beyond PS limits\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 — inert across pH 2–12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute acids (HCl, H₂SO₄, \u0026lt;10%)\u003c\/td\u003e\n\u003ctd\u003eGood — adequate for SPE wash steps and reaction media\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute bases (NaOH, \u0026lt;10%)\u003c\/td\u003e\n\u003ctd\u003eExcellent — preferred over PS for caustic reagents\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMethanol \/ acetonitrile (\u0026lt;100%)\u003c\/td\u003e\n\u003ctd\u003eExcellent — full compatibility with organic modifier eluents\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlcohols (ethanol, isopropanol)\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents (chloroform, DCM)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic solvents (toluene, xylene)\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 BPA-free, phthalate-free, and latex-free. Caplugs® Evergreen manufactures under ISO 9001 quality management, and the single-use format eliminates washing steps and cross-contamination risk between samples. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, typically same business day for stocking items, with volume pricing available for institutional, clinical, and grant-funded laboratories ordering at quantity.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum temperature these tubes can handle?\u003c\/strong\u003e\u003cbr\u003ePolypropylene is rated to approximately 80°C, making these tubes suitable for water bath incubations at temperatures that would deform or fail polystyrene equivalents, which are typically limited to around 60°C.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these tubes be used with acetonitrile or methanol eluents?\u003c\/strong\u003e\u003cbr\u003eYes — polypropylene offers full compatibility with acetonitrile and methanol at concentrations up to 100%, which is why this format is the standard choice for SPE eluate collection and organic-modifier reaction workflows where PS tubes are not appropriate.\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 bulk packaging. This format is intended for chemical, analytical, and biochemical workflows where sterility is not required. Contact us if your application requires a sterile alternative.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between these PP tubes and the PS 19 mL round-bottom tubes?\u003c\/strong\u003e\u003cbr\u003eBoth formats share the same 16 × 125 mm geometry and 19 mL capacity, but polypropylene provides significantly broader solvent compatibility (including organic modifiers and caustic bases), a higher thermal ceiling (~80°C vs. ~60°C for PS), and resistance across pH 2–12. Polystyrene is preferred only where optical clarity and lower cost are priorities and no organic solvents are involved.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"19 mL Round-Bottom PP Test Tubes, 16 × 125 mm, Natural, Non-Sterile — 1000\/Bag\",\"sku\":\"214234503NE1\",\"mpn\":\"214-2345-03N\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polypropylene (PP)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"154.19\",\"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\":\"What is the maximum temperature these tubes can handle?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Polypropylene is rated to approximately 80°C, making these tubes suitable for water bath incubations at temperatures that would deform or fail polystyrene equivalents, which are typically limited to around 60°C.\"}},{\"@type\":\"Question\",\"name\":\"Can these tubes be used with acetonitrile or methanol eluents?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — polypropylene offers full compatibility with acetonitrile and methanol at concentrations up to 100%, which is why this format is the standard choice for SPE eluate collection and organic-modifier reaction workflows where PS tubes are not appropriate.\"}},{\"@type\":\"Question\",\"name\":\"Are these tubes sterile?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — they are supplied non-sterile in 1000\/Bag bulk packaging. 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