{"product_id":"round-bottom-test-tubes-8-0ml-13-x-100mm-screw-cap-ps-222206805ie1","title":"8.0 mL Test Tubes, Screw Caps, PS, Natural — 222-2068-05I | 1\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e8.0 mL Round Bottom Test Tubes with Natural Screw Caps — PS, Sterile, 13 × 100 mm (222-2068-05I)\u003c\/h2\u003e\n\u003cp\u003eThese 8.0 mL polystyrene round bottom test tubes ship individually packed with natural screw caps, offering a leak-resistant threaded closure ideal for specimen containment, transport, and analytical workflows. Measuring 13 × 100 mm, the round bottom geometry concentrates cell pellets and precipitates at the tube base for efficient resuspension and aspiration after centrifugation. Each tube arrives sterile in sealed individual packaging, maintaining integrity from receipt through point-of-use.\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\u003e222-2068-05I\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\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 — the round bottom format and PS optical clarity are standard requirements for fluorescent cell analysis platforms\u003c\/li\u003e\n\u003cli\u003eImmunofluorescence staining — transparent PS walls allow direct visual inspection of stained cell populations\u003c\/li\u003e\n\u003cli\u003eCell sorting — round bottom concentrates sorted populations for downstream recovery\u003c\/li\u003e\n\u003cli\u003eHematology sample preparation — the 8.0 mL, 13 × 100 mm format accommodates standard blood-derived sample volumes\u003c\/li\u003e\n\u003cli\u003eSerological and agglutination assays — round bottom geometry supports consistent reaction pooling\u003c\/li\u003e\n\u003cli\u003eSpecimen collection and clinical transport — threaded screw cap provides superior leak-resistance compared to snap-cap formats\u003c\/li\u003e\n\u003cli\u003eGeneral laboratory sample storage requiring a sterile, individually packaged 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\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute bases\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMethanol\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsopropanol\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcetonitrile\u003c\/td\u003e\n\u003ctd\u003eCompatible\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 ISO-certified Caplugs® Evergreen manufacturing facilities, these tubes are produced from virgin-grade, FDA-registered polystyrene resin and are certified BPA-free and phthalate-free. Lot-level quality controls ensure consistent tube geometry, wall thickness, and dimensional uniformity across every individually packed unit. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered pricing available for high-volume institutional, clinical, and grant-funded laboratory accounts.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these tubes sterile, and how is sterility maintained?\u003c\/strong\u003e\u003cbr\u003eYes — each tube is individually packed in sealed packaging that preserves sterility from the point of manufacture through point-of-use, making them suitable for cell culture, clinical specimen collection, and other contamination-sensitive workflows.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these tubes compatible with flow cytometry instruments?\u003c\/strong\u003e\u003cbr\u003eYes. The 13 × 100 mm round bottom PS format is the standard tube geometry accepted by most flow cytometry and FACS platforms. The polystyrene construction offers the optical clarity required for fluorescent dye and stain compatibility in cell analysis workflows.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy choose a screw cap over a snap cap for this tube size?\u003c\/strong\u003e\u003cbr\u003eThe threaded natural screw cap creates a more secure, leak-resistant seal than snap-cap designs, which is especially important during specimen transport, centrifugation, and storage of liquid samples in an 8.0 mL tube.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these tubes be autoclaved or used with organic solvents?\u003c\/strong\u003e\u003cbr\u003eNo. Polystyrene is not autoclavable and is not recommended for use with aromatic solvents, chlorinated solvents, or acetone. These tubes are well suited for aqueous buffers, dilute acids and bases, and short-term contact with lower-concentration alcohols such as methanol and isopropanol.\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 — 1\/Individually Packed\",\"sku\":\"222206805IE1\",\"mpn\":\"222-2068-05I\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polystyrene (PS)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"279.56\",\"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, and how is sterility maintained?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — each tube is individually packed in sealed packaging that preserves sterility from the point of manufacture through point-of-use, making them suitable for cell culture, clinical specimen collection, and other contamination-sensitive workflows.\"}},{\"@type\":\"Question\",\"name\":\"Are these tubes compatible with flow cytometry instruments?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The 13 × 100 mm round bottom PS format is the standard tube geometry accepted by most flow cytometry and FACS platforms. The polystyrene construction offers the optical clarity required for fluorescent dye and stain compatibility in cell analysis workflows.\"}},{\"@type\":\"Question\",\"name\":\"Why choose a screw cap over a snap cap for this tube size?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The threaded natural screw cap creates a more secure, leak-resistant seal than snap-cap designs, which is especially important during specimen transport, centrifugation, and storage of liquid samples in an 8.0 mL tube.\"}},{\"@type\":\"Question\",\"name\":\"Can these tubes be autoclaved or used with organic solvents?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. Polystyrene is not autoclavable and is not recommended for use with aromatic solvents, chlorinated solvents, or acetone. 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