{"product_id":"round-bottom-test-tubes-4-0ml-10-x-75mm-ps-2222003010e1","title":"4.0 mL Test Tubes, Round Bottom, PS, Natural — 222-2003-010 | 25\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e4.0 mL Round Bottom Test Tubes — Polystyrene, Natural, Sterile, 10 × 75 mm (222-2003-010)\u003c\/h2\u003e\n\u003cp\u003eThese 4.0 mL round bottom test tubes measure 10 × 75 mm and are manufactured from virgin-grade polystyrene (PS) for excellent optical clarity and compatibility with fluorescent dyes used in cell analysis workflows. Supplied sterile in sealed 25\/Bag packaging, they are ready for use in flow cytometry, immunofluorescence, cell sorting, and routine sample preparation without any additional prep. The round bottom geometry concentrates cell pellets and precipitates at the tube base, enabling efficient resuspension and aspiration following centrifugation.\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\u003e222-2003-010\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e4.0 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e10 × 75 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\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\u003eCap\u003c\/td\u003e\n\u003ctd\u003eNone (open top)\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 — round bottom concentrates cell pellets for efficient resuspension after centrifugation\u003c\/li\u003e\n\u003cli\u003eImmunofluorescence staining — PS optical clarity supports visual and instrument-based inspection with standard fluorescent dyes\u003c\/li\u003e\n\u003cli\u003eCell sorting workflows requiring consistent 10 × 75 mm tube geometry\u003c\/li\u003e\n\u003cli\u003eHematology sample preparation and specimen handling at the 4.0 mL working volume\u003c\/li\u003e\n\u003cli\u003eSerological testing and agglutination assays where a round bottom format aids in reading reactions\u003c\/li\u003e\n\u003cli\u003eGeneral laboratory sample collection and processing requiring sterile, lot-traceable tubes\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 suitable — 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 at Caplugs® Evergreen ISO-certified facilities, these tubes are produced from virgin-grade, BPA-free, phthalate-free polystyrene to ensure consistent wall thickness, round bottom radius, and dimensional uniformity across every tube in the bag. Each bag carries a lot number to support full traceability in CAP-, CLIA-, and ISO 15189-regulated environments. 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 — the tubes are supplied sterile in sealed packaging and are ready to use at the point of opening, with no additional sterilization required.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo these tubes come with caps?\u003c\/strong\u003e\u003cbr\u003eNo — part number 222-2003-010 is an open-top tube with no cap included. If closure is needed for your workflow, a separately purchased cap compatible with 10 × 75 mm tubes should be selected.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy are round bottom tubes preferred for flow cytometry?\u003c\/strong\u003e\u003cbr\u003eThe curved base concentrates cell pellets and precipitates into a tight mass after centrifugation, making resuspension more complete and aspiration easier than a flat bottom tube allows.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these tubes be used with organic solvents or autoclaved?\u003c\/strong\u003e\u003cbr\u003ePolystyrene is well suited to aqueous buffers, dilute acids and bases, and short-term contact with alcohols, but it is not compatible with acetone, aromatic solvents, or chlorinated solvents. PS tubes cannot be autoclaved; use polypropylene tubes where heat sterilization is required.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"4.0 mL Round Bottom Test Tubes, Polystyrene, Natural, Sterile, 10 × 75 mm — 25\/Bag\",\"sku\":\"2222003010E1\",\"mpn\":\"222-2003-010\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polystyrene (PS)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"79.88\",\"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 — the tubes are supplied sterile in sealed packaging and are ready to use at the point of opening, with no additional sterilization required.\"}},{\"@type\":\"Question\",\"name\":\"Do these tubes come with caps?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — these are open-top tubes with no cap included. 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