{"product_id":"214-2099-e50-round-bottom-screw-cap-tube","title":"15–21 mL Test Tubes, Screw Caps, PS, Orange — 214-2099-E50 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e21 mL Round-Bottom Test Tubes with Orange Screw Caps — PS, 16 × 150 mm, 1000\/Bag (214-2099-E50)\u003c\/h2\u003e\n\u003cp\u003eThese 21 mL polystyrene round-bottom test tubes ship with matching orange screw caps in an unassembled 1000\/Bag pack, allowing lab staff to apply caps at the point of sealing and minimize open-tube exposure in high-throughput workflows. At 16 × 150 mm, they represent the largest round-bottom tube in the Caplugs® Evergreen catalog and are suited to bulk reagent preparation, extended inversion mixing, large-volume culture, and multi-day sample storage. The orange screw cap delivers a leak-resistant re-close for transport and reflex testing, and its vivid color provides immediate rack-level identification for STAT lanes, immunoassay panels, or designated patient cohorts.\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\u003e214-2099-E50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e21 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimensions\u003c\/td\u003e\n\u003ctd\u003e16 × 150 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGeometry\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\u003eTube Color\u003c\/td\u003e\n\u003ctd\u003eNatural (clear)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap Style\u003c\/td\u003e\n\u003ctd\u003eScrew Cap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap Color\u003c\/td\u003e\n\u003ctd\u003eOrange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembly\u003c\/td\u003e\n\u003ctd\u003eUnassembled (tubes and caps supplied separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSterility\u003c\/td\u003e\n\u003ctd\u003eNon-Sterile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003e1000\/Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBPA \/ Phthalate \/ Latex\u003c\/td\u003e\n\u003ctd\u003eBPA-Free, Phthalate-Free, Latex-Free\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\u003eSample storage at refrigerated (4 °C) or frozen (−20 °C) conditions with secure screw-cap re-closure\u003c\/li\u003e\n\u003cli\u003eSample transport in tube carriers or secondary containment, with the screw cap providing a leak-resistant seal\u003c\/li\u003e\n\u003cli\u003eReflex and add-on testing — re-cap and refrigerate after the initial analytical run without aliquot transfer\u003c\/li\u003e\n\u003cli\u003eBulk reagent, calibrator, and control preparation where the full 21 mL working volume is needed\u003c\/li\u003e\n\u003cli\u003eWater bath incubation at 37 °C in standard 16 × 150 mm tube racks\u003c\/li\u003e\n\u003cli\u003eManual inversion mixing protocols that benefit from the maximum headspace of the longest tube in this product family\u003c\/li\u003e\n\u003cli\u003eCentrifugation in clinical centrifuges equipped with a 16 mm rotor adapter\u003c\/li\u003e\n\u003cli\u003eColor-coded cohort or analyte-class identification — orange caps are commonly assigned to STAT\/priority lanes or specific immunoassay panels\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 and saline\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute acids and bases (routine chemistry pH range)\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater bath incubation up to 60 °C\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthanol \u0026gt; 70% \/ isopropanol\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\u003eAromatic or chlorinated solvents\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 tubes are produced by Caplugs® Evergreen under ISO 9001 quality management from FDA-compliant, BPA-free, phthalate-free, and latex-free polystyrene resin. The natural PS wall offers optical clarity suitable for direct visual inspection and spectrophotometric reading without tube-to-tube transfer. LabSupplies.com is an authorized dealer carrying USA inventory and ships stocking items typically the same business day; volume pricing is available for institutional, clinical, and grant-funded laboratories placing multi-bag orders.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre the tubes and caps packaged already assembled?\u003c\/strong\u003e\u003cbr\u003eNo — part number 214-2099-E50 is supplied unassembled, with tubes and orange screw caps packed separately in the same bag. This lets lab staff cap each tube at the moment of sealing, reducing open-tube exposure time in busy workflows.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these tubes be used with organic solvents or autoclaved?\u003c\/strong\u003e\u003cbr\u003ePolystyrene is not recommended for use with acetone, alcohols above 70%, or aromatic and chlorinated solvents, and it cannot be autoclaved. For solvent-heavy or autoclave-required applications, a polypropylene tube is a better choice.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is the cap orange, and does the color carry any standard meaning?\u003c\/strong\u003e\u003cbr\u003eOrange is the cap color assigned to this SKU within the Caplugs® Evergreen 21 mL screw-cap series. In many clinical and research labs, orange is conventionally reserved for STAT or priority sample lanes and specific immunoassay or analyte-class panels, making it easy to identify the correct tubes at a glance across a fully loaded rack.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs a tubes-only (no cap) option or other cap colors available for the same 21 mL format?\u003c\/strong\u003e\u003cbr\u003eYes. The same 16 × 150 mm PS round-bottom tube without a cap is available as a separate SKU, and the 21 mL screw-cap family is offered in blue, green, lavender, red, and yellow cap colors in addition to this orange version — allowing labs to standardize on one tube size while color-coding multiple sample classes or study cohorts.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"21 mL Round-Bottom Test Tubes with Orange Screw Caps, PS, 16 × 150 mm, Unassembled — 1000\/Bag\",\"sku\":\"2142099E50E1\",\"mpn\":\"214-2099-E50\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polystyrene (PS)\",\"color\":\"Natural tube, Orange cap\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"264.50\",\"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 already assembled?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — part number 214-2099-E50 is supplied unassembled, with tubes and orange screw caps packed separately in the same bag. This lets lab staff cap each tube at the moment of sealing, reducing open-tube exposure time in busy workflows.\"}},{\"@type\":\"Question\",\"name\":\"Can these tubes be used with organic solvents or autoclaved?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Polystyrene is not recommended for use with acetone, alcohols above 70%, or aromatic and chlorinated solvents, and it cannot be autoclaved. For solvent-heavy or autoclave-required applications, a polypropylene tube is a better choice.\"}},{\"@type\":\"Question\",\"name\":\"Why is the cap orange, and does the color carry any standard meaning?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Orange is the cap color assigned to this SKU within the Caplugs® Evergreen 21 mL screw-cap series. In many clinical and research labs, orange is conventionally reserved for STAT or priority sample lanes and specific immunoassay or analyte-class panels, making it easy to identify the correct tubes at a glance across a fully loaded rack.\"}},{\"@type\":\"Question\",\"name\":\"Is a tubes-only option or other cap colors available for the same 21 mL format?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. The same 16 × 150 mm PS round-bottom tube without a cap is available as a separate SKU, and the 21 mL screw-cap family is offered in blue, green, lavender, red, and yellow cap colors in addition to this orange version — allowing labs to standardize on one tube size while color-coding multiple sample classes or study cohorts.\"}}]}\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48556010537192,"sku":"2142099E50E1","price":264.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/214-2099-E50_88bd8d52-98e6-456a-9c1f-a83c186bced8.png?v=1778725151","url":"https:\/\/labsupplies.com\/products\/214-2099-e50-round-bottom-screw-cap-tube","provider":"LabSupplies.com","version":"1.0","type":"link"}