{"product_id":"conical-centrifuge-tubes-50ml-ppc-2203937080e1","title":"50 mL Centrifuge Tubes, Conical Bottom, PPC, Natural — 220-3937-080 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e50 mL Conical Centrifuge Tubes — Threaded Cap, PPC, Natural, 1000\/Bag (220-3937-080)\u003c\/h2\u003e\n\u003cp\u003eThese 50 mL conical-bottom centrifuge tubes are molded from virgin-grade Polypropylene Copolymer (PPC) and supplied non-sterile in sealed 1000\/Bag packaging for high-volume clinical and research workflows. The threaded cap delivers a leak-resistant seal that outperforms snap-cap formats under centrifugal force and during sample transport, while the conical bottom geometry concentrates cell pellets and precipitates at the tip for complete, low-dead-volume recovery. Lot-to-lot dimensional consistency ensures reliable seating in standard centrifuge rotor positions across the full case quantity.\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\u003e220-3937-080\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e50 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBottom Style\u003c\/td\u003e\n\u003ctd\u003eConical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap Style\u003c\/td\u003e\n\u003ctd\u003eThreaded — leak-resistant seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePolypropylene Copolymer (PPC)\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\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 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\u003eCell culture harvesting — conical geometry pellets cells completely at the tube tip for maximum recovery\u003c\/li\u003e\n\u003cli\u003eSerum and plasma separation — threaded closure prevents leakage during centrifugation and subsequent handling\u003c\/li\u003e\n\u003cli\u003eProtein precipitation and density gradient centrifugation — precise pellet concentration at the conical tip\u003c\/li\u003e\n\u003cli\u003eClinical specimen processing and transport — secure threaded seal prevents evaporation and contamination\u003c\/li\u003e\n\u003cli\u003eReagent preparation and storage — chemical-resistant PPC compatible with aqueous buffers and common laboratory solvents\u003c\/li\u003e\n\u003cli\u003eSample preparation workflows in CAP-, CLIA-, and ISO 15189-accredited laboratories requiring lot-traceable consumables\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 solvents (e.g., toluene, xylene)\u003c\/td\u003e\n\u003ctd\u003eLimited — not recommended for prolonged contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents (e.g., chloroform, DCM)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\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 FDA-registered, virgin-grade PPC resin that is BPA-free and phthalate-free. Sealed 1000\/Bag packaging maintains product integrity from warehouse receipt through point-of-use, and lot-level quality controls ensure consistent conical geometry, wall thickness, and threaded cap torque performance across every bag. LabSupplies.com is an authorized Caplugs® Evergreen dealer, ships from USA inventory with same-business-day fulfillment for stocking items, and offers tiered pricing for institutional, hospital, and grant-funded laboratory accounts.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these centrifuge tubes sterile?\u003c\/strong\u003e\u003cbr\u003eNo — the 50 mL tubes supplied under part number 220-3937-080 are non-sterile. They are intended for general cell culture, sample preparation, and specimen processing workflows where sterility is not a requirement. If your protocol requires sterile tubes, please contact us for alternatives.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre PPC centrifuge tubes autoclavable?\u003c\/strong\u003e\u003cbr\u003ePolypropylene Copolymer (PPC) offers good heat tolerance and is generally considered autoclavable; however, Caplugs® Evergreen has not published a validated autoclave cycle for these specific tubes. Confirm your sterilization requirements with your quality team before autoclaving, as the threaded cap seal may be affected by repeated high-temperature cycling.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat centrifuge rotors are these tubes compatible with?\u003c\/strong\u003e\u003cbr\u003eThe standard 50 mL conical format fits most swing-bucket and fixed-angle rotors designed for 50 mL conical tubes across major centrifuge platforms. Always verify maximum RCF ratings against your specific rotor manufacturer's specifications before centrifuging at high speeds.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy choose a threaded cap over a snap-cap design for these tubes?\u003c\/strong\u003e\u003cbr\u003eA threaded closure creates a more reliable leak-resistant seal under centrifugal force and during sample transport than a snap-cap format, reducing the risk of cross-contamination, evaporation, and sample loss — particularly important in clinical specimen handling and regulated laboratory environments.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"50 mL Conical Centrifuge Tubes, Threaded Cap, PPC, Natural — 1000\/Bag\",\"sku\":\"2203937080E1\",\"mpn\":\"220-3937-080\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polypropylene Copolymer (PPC)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"180.07\",\"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 centrifuge tubes sterile?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — these 50 mL tubes are non-sterile. 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