{"product_id":"caplugs-214-3739-020-18ml-microcentrifuge-tube-natural","title":"1.8 mL Microcentrifuge Tubes, Conical Bottom, HDPE, Natural — 214-3739-020 | 1,000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e1.8 mL Conical Microcentrifuge Tubes — HDPE, Natural, 1,000\/Bag (214-3739-020)\u003c\/h2\u003e\n\u003cp\u003eThese 1.8 mL conical microcentrifuge tubes are precision-molded from virgin High-Density Polyethylene (HDPE) for centrifugation, sample preparation, and storage workflows in clinical, research, and industrial laboratories. The conical bottom geometry minimizes dead volume and ensures complete pellet recovery — a critical factor in precipitation, nucleic acid isolation, and cell harvest protocols where sample yield directly affects downstream assay performance. Supplied non-sterile in a sealed bulk bag of 1,000, they ship ready for high-throughput use straight from stockroom to bench.\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\u003e214-3739-020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCapacity\u003c\/td\u003e\n\u003ctd\u003e1.8 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBottom Geometry\u003c\/td\u003e\n\u003ctd\u003eConical\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube OD\u003c\/td\u003e\n\u003ctd\u003e11 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eHigh-Density Polyethylene (HDPE)\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\u003e1,000\/Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBPA \/ Phthalates\u003c\/td\u003e\n\u003ctd\u003eBPA-free; no phthalate plasticizers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCountry of Origin\u003c\/td\u003e\n\u003ctd\u003eUSA (California)\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\u003eMicrocentrifugation and high-speed pelleting of cells, beads, and precipitates\u003c\/li\u003e\n\u003cli\u003eDNA, RNA, and protein isolation via spin-column extraction protocols\u003c\/li\u003e\n\u003cli\u003ePCR and qPCR reagent and template preparation\u003c\/li\u003e\n\u003cli\u003eShort- and long-term sample storage of aqueous buffers, sera, and biological specimens\u003c\/li\u003e\n\u003cli\u003eEthanol precipitation, isopropanol precipitation, and other nucleic acid concentration workflows\u003c\/li\u003e\n\u003cli\u003eIndustrial and clinical chemistry sample processing requiring reliable pellet recovery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eWith a standard 11 mm OD, these tubes fit the 1.5\/1.8\/2.0 mL rotor positions found on the most widely used benchtop microcentrifuges. Verified compatible platforms include the Eppendorf® Centrifuge 5415D, 5415R, 5424, 5424R, and MiniSpin®; Thermo Fisher Sorvall™ Legend Micro 17 and 21 and Heraeus® Pico 17 and 21; VWR®\/Avantor Galaxy 16DH and Galaxy 16 standard 24-position fixed-angle rotors; Labnet® Prism™ R Refrigerated Microcentrifuge (C2500-R) in all rotor configurations accepting the 1.5\/2.0 mL format; and Sigma\/Sartorius 1-15K, 1-16K, and 3-18KS microcentrifuges in both swing-bucket and fixed-angle configurations. Always verify your specific rotor's maximum OD tolerance before switching from OEM supply.\u003c\/p\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 solutions\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute acids and dilute bases\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShort-chain alcohols (ethanol, isopropanol)\u003c\/td\u003e\n\u003ctd\u003eGood — suitable for precipitation protocols\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMany organic solvents (general)\u003c\/td\u003e\n\u003ctd\u003eGood — HDPE offers broad organic resistance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents (chloroform, DCM)\u003c\/td\u003e\n\u003ctd\u003eUse with caution — verify compatibility before extended contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic solvents (toluene, xylene)\u003c\/td\u003e\n\u003ctd\u003eNot recommended for prolonged contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave sterilization\u003c\/td\u003e\n\u003ctd\u003eNot recommended — HDPE 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's California manufacturing facility, these tubes are molded from virgin HDPE resin under strict dimensional quality-control protocols that ensure lot-to-lot consistency in wall thickness and cap-thread tolerance. All pigmentation is compounded directly into the resin — there are no leachable surface coatings. The tubes are BPA-free and contain no phthalate plasticizers, meeting the material-safety requirements of clinical and regulated research environments. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered pricing available for institutional, hospital, and grant-funded procurement accounts.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these microcentrifuge tubes sterile?\u003c\/strong\u003e\u003cbr\u003eNo — the 214-3739-020 tubes are supplied non-sterile in bulk 1,000\/Bag packaging. For applications requiring sterility, consider gamma-irradiated alternatives or in-house sterilization methods compatible with HDPE (note that HDPE is not autoclavable).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the tube OD, and will these fit standard microcentrifuge rotors?\u003c\/strong\u003e\u003cbr\u003eThe tubes have a standard 11 mm outer diameter, which seats correctly in the 1.5\/1.8\/2.0 mL rotor positions of most benchtop microcentrifuges from Eppendorf, Thermo Fisher, VWR\/Avantor, Labnet, and Sigma\/Sartorius. Always confirm your specific rotor's OD specification before switching from OEM supply.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy choose HDPE over polypropylene for microcentrifuge tubes?\u003c\/strong\u003e\u003cbr\u003eHDPE offers excellent resistance to a broad range of aqueous reagents, dilute acids and bases, and many organic solvents, making it well suited for general sample storage and processing workflows. Polypropylene is preferred when autoclave sterilization is required, since HDPE is not autoclavable. Both materials are BPA-free and low in extractables.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the natural color allow visual inspection of the sample?\u003c\/strong\u003e\u003cbr\u003eYes — the semi-opaque natural finish of HDPE allows technicians to visually monitor sample levels, pellet formation, and phase separation without opening the tube, which is particularly useful during centrifugation and precipitation workflows.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"1.8 mL Conical Microcentrifuge Tubes, HDPE, Natural, 1,000\/Bag — Caplugs® Evergreen 214-3739-020\",\"sku\":\"214-3739-020\",\"mpn\":\"214-3739-020\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Natural\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"57.70\",\"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 microcentrifuge tubes sterile?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — the tubes are supplied non-sterile in bulk 1,000\/Bag packaging. 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