{"product_id":"round-bottom-test-tubes-19ml-16-x-125mm-screw-cap-ps-222208905ie1","title":"19 mL Test Tubes, Screw Caps, PS, Natural — 222-2089-05I | 1\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e19 mL Round Bottom Test Tubes with Natural Screw Caps — Polystyrene, Sterile, 16 × 125 mm (222-2089-05I)\u003c\/h2\u003e\n\u003cp\u003eThese 19 mL polystyrene round bottom test tubes ship individually packed and pre-sterilized, making them ready for immediate use in flow cytometry, cell sorting, and clinical sample preparation workflows. Measuring 16 × 125 mm, the round bottom geometry concentrates cell pellets and precipitates at the tube base for efficient resuspension after centrifugation, while the natural screw cap delivers a threaded, leak-resistant closure superior to snap-cap formats for large-volume specimen handling and transport.\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\u003e222-2089-05I\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\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\u003eBottom Style\u003c\/td\u003e\n\u003ctd\u003eRound Bottom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap Style\u003c\/td\u003e\n\u003ctd\u003eNatural Screw Cap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePolystyrene (PS)\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\u003eSterile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003e1 \/ Individually Packed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBPA \/ Phthalate Free\u003c\/td\u003e\n\u003ctd\u003eYes\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\u003eFlow cytometry and FACS analysis — round bottom PS is the standard tube format for most cytometer sample probes\u003c\/li\u003e\n\u003cli\u003eImmunofluorescence staining — optical clarity of polystyrene supports visual and instrument-based inspection of fluorescent samples\u003c\/li\u003e\n\u003cli\u003eCell sorting and pellet concentration — round bottom geometry focuses pellets tightly at the tube base for clean aspiration after centrifugation\u003c\/li\u003e\n\u003cli\u003eHematology sample preparation — 19 mL capacity and 16 × 125 mm dimensions suit standard hematology workflows\u003c\/li\u003e\n\u003cli\u003eSerological testing and agglutination assays — round bottom format facilitates reading of agglutination reactions\u003c\/li\u003e\n\u003cli\u003eSpecimen collection and transport — threaded screw cap provides secure, leak-resistant containment during handling and transit\u003c\/li\u003e\n\u003cli\u003eGeneral laboratory sample storage — individual sterile packaging ensures integrity from receipt through point-of-use\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\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute bases\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMethanol\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsopropanol\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcetonitrile\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic \/ chlorinated solvents\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\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave\u003c\/td\u003e\n\u003ctd\u003eNot compatible — PS is not autoclavable\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, these Caplugs® Evergreen tubes are produced from virgin-grade, FDA-registered polystyrene resin that is BPA-free and phthalate-free, under ISO-certified quality management with lot-level traceability to support CAP, CLIA, and ISO 15189 documentation requirements. Individual sterile packaging maintains integrity from the manufacturing line through the point of use, eliminating the need for pre-use sterilization steps. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with volume and institutional pricing available for high-throughput clinical and research laboratories.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these tubes sterile out of the package?\u003c\/strong\u003e\u003cbr\u003eYes — each tube and cap is individually packed and supplied sterile. The sealed packaging maintains that sterility from manufacturing through point-of-use, so no pre-use sterilization step is required.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these tubes compatible with standard flow cytometers?\u003c\/strong\u003e\u003cbr\u003eA 16 × 125 mm round bottom polystyrene tube is the widely accepted format for most flow cytometry and FACS platforms. Verify your instrument's sample tube specifications before use, as some analyzers specify a particular outer diameter or wall thickness.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these tubes be autoclaved for reuse?\u003c\/strong\u003e\u003cbr\u003eNo — polystyrene is not autoclavable and will deform under steam sterilization conditions. These tubes are designed for single-use applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between a screw cap and a snap cap for this tube format?\u003c\/strong\u003e\u003cbr\u003eThe threaded natural screw cap on these tubes creates a more secure, leak-resistant closure than a snap cap, which is particularly important during specimen transport, centrifugation, or any application where tube orientation may change. Snap caps are typically used for quick-access workflows where repeated opening is required.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"19 mL Round Bottom Test Tubes with Natural Screw Caps, Polystyrene, Sterile, 16 × 125 mm — Caplugs® Evergreen 222-2089-05I\",\"sku\":\"222208905IE1\",\"mpn\":\"222-2089-05I\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polystyrene (PS)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"278.11\",\"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\":\"Are these tubes sterile out of the package?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — each tube and cap is individually packed and supplied sterile. 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