{"product_id":"round-bottom-test-tubes-8-0ml-13-x-100mm-screw-cap-ps-2222068050e1","title":"8.0 mL Test Tubes, Screw Caps, PS, Natural — 222-2068-050 | 25\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e8.0 mL Round Bottom Test Tubes with Natural Screw Caps — PS, Sterile, 13 × 100 mm (222-2068-050)\u003c\/h2\u003e\n\u003cp\u003eThese 8.0 mL polystyrene round-bottom test tubes ship sterile in 25\/Bag packs and are supplied unassembled — tubes and caps packaged separately — so your team can assemble them immediately before use for maximum flexibility. At 13 × 100 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 leak-resistant threaded closure suited for specimen transport and storage. The optical clarity of virgin-grade PS makes these tubes a natural fit for flow cytometry, fluorescence-based assays, and any workflow where visual sample inspection matters.\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\u003e222-2068-050\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e8.0 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e13 × 100 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 Type\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 — round-bottom PS is the standard format for most cytometer sample introduction systems\u003c\/li\u003e\n\u003cli\u003eImmunofluorescence staining and cell sorting, benefiting from PS optical clarity and consistent tube geometry\u003c\/li\u003e\n\u003cli\u003eHematology sample preparation and serological \/ agglutination testing in the 13 × 100 mm format\u003c\/li\u003e\n\u003cli\u003eSpecimen collection and clinical specimen storage where a leak-resistant screw cap is preferred over snap-cap formats\u003c\/li\u003e\n\u003cli\u003eGeneral laboratory sample handling requiring sterile, single-use tubes with defined round-bottom pellet geometry\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\u003eAcetone \/ aromatic solvents \/ chlorinated solvents\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave \/ heat sterilization\u003c\/td\u003e\n\u003ctd\u003eNot recommended — 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 at ISO-certified facilities from FDA-registered virgin-grade polystyrene resin that is BPA-free and phthalate-free. Sealed sterile packaging maintains integrity from receipt through point-of-use, and lot-level quality controls ensure consistent tube geometry, wall thickness, and dimensional uniformity across every bag. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with volume and institutional pricing available for clinical laboratories, research institutions, and biotech organizations.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre the tubes and caps packaged together, ready to use?\u003c\/strong\u003e\u003cbr\u003eNo — part number 222-2068-050 is supplied unassembled, meaning tubes and caps are packaged separately within the bag. This allows you to assemble each tube immediately before use, which is common practice in flow cytometry and cell-sorting workflows to avoid any risk of pre-assembly contamination.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these tubes compatible with standard flow cytometers?\u003c\/strong\u003e\u003cbr\u003eYes. The 13 × 100 mm round-bottom PS format is widely recognized as the standard tube geometry for flow cytometry and FACS sample introduction. However, always verify the tube outer diameter and length against your specific instrument's sample carousel or tube holder specifications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I autoclave these tubes?\u003c\/strong\u003e\u003cbr\u003eNo. Polystyrene is not autoclavable and will deform under high heat. These tubes are supplied sterile from the factory, so autoclaving is not necessary for standard sterile workflows.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these tubes certified RNase- and DNase-free?\u003c\/strong\u003e\u003cbr\u003eThe source data provided does not include a DNase\/RNase-free certification for this product. Contact our team or request the current lot documentation to confirm suitability for nucleic acid work before use in sensitive molecular applications.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"8.0 mL Round Bottom Test Tubes with Natural Screw Caps, PS, Sterile, 13 × 100 mm — 25\/Bag Unassembled\",\"sku\":\"2222068050E1\",\"mpn\":\"222-2068-050\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polystyrene (PS)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"193.50\",\"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 the tubes and caps packaged together, ready to use?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — these tubes are supplied unassembled, meaning tubes and caps are packaged separately within the bag. 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