{"product_id":"round-bottom-test-tubes-19ml-16-x-125mm-screw-cap-ps-2222088050e1","title":"19 mL Test Tubes, Screw Caps, PS, Natural — 222-2088-050 | 25\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e19 mL Round Bottom Test Tubes with Natural Screw Caps — Polystyrene, Sterile, 25\/Bag (222-2088-050)\u003c\/h2\u003e\n\u003cp\u003eThese 19 mL round bottom polystyrene test tubes measure 16 × 125 mm and ship sterile in 25\/Bag unassembled packaging, with tubes and natural screw caps packed separately for assembly immediately before use. The round bottom geometry concentrates cell pellets and precipitates at the tube base for efficient resuspension and aspiration after centrifugation, while the threaded natural screw cap delivers a leak-resistant closure suited to specimen transport and storage. Part number 222-2088-050 is a workhorse tube for flow cytometry, FACS analysis, immunofluorescence, and clinical sample preparation workflows.\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\u003e222-2088-050\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\u003eAssembly\u003c\/td\u003e\n\u003ctd\u003eUnassembled (tubes and caps packaged separately)\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\u003e25\/Bag\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 — the round bottom PS tube is the standard format for most cytometer sample introduction systems\u003c\/li\u003e\n\u003cli\u003eImmunofluorescence staining and cell sorting, where PS optical clarity allows visual inspection of sample color and turbidity\u003c\/li\u003e\n\u003cli\u003eHematology sample preparation and serological \/ agglutination assays requiring a 16 × 125 mm round bottom format\u003c\/li\u003e\n\u003cli\u003eSpecimen collection and transport where the threaded screw cap provides leak-resistant containment superior to snap-cap closures\u003c\/li\u003e\n\u003cli\u003eGeneral laboratory sample handling, dilution series, and pellet-concentration workflows requiring an economical sterile tube\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 sterilization\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 manufactured from virgin-grade, FDA-registered polystyrene resin under ISO-certified quality management, and are BPA-free and phthalate-free. Sealed sterile packaging maintains integrity from receipt through point-of-use, and lot-level traceability supports CAP, CLIA, and ISO 15189 documentation requirements. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with tiered pricing available for high-volume institutional and grant-funded accounts.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these tubes sterile out of the bag?\u003c\/strong\u003e\u003cbr\u003eYes — they are supplied sterile and individually protected within sealed packaging. Because the tubes and caps are packaged unassembled, simply assemble each tube immediately before use to maintain sterility at the point of use.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy are the tubes and caps packaged separately?\u003c\/strong\u003e\u003cbr\u003eThe unassembled format lets users assemble each tube immediately before use, preserving the interior sterile environment and giving labs flexibility to inspect tubes and caps individually before committing them to a workflow.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these compatible with standard flow cytometers and FACS instruments?\u003c\/strong\u003e\u003cbr\u003eRound bottom 16 × 125 mm polystyrene tubes in this size class are the widely accepted standard format for most flow cytometers and cell sorters. Confirm the tube outer diameter and length requirements specified in your instrument's operator manual before substituting OEM-supplied tubes.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these tubes be autoclaved or reused?\u003c\/strong\u003e\u003cbr\u003eNo — polystyrene is not autoclavable and these tubes are intended for single use. Attempting to autoclave PS tubes will cause deformation and loss of dimensional integrity.\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 — PS, Sterile, 25\/Bag\",\"sku\":\"2222088050E1\",\"mpn\":\"222-2088-050\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polystyrene (PS)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"193.20\",\"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 bag?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — they are supplied sterile and individually protected within sealed packaging. 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