{"product_id":"caplugs-300-3710-g20-hdpe-microcentrifuge-tube-stopper-cap-10ml-green","title":"1.0 mL Test Tube Stoppers, HDPE, Green — 300-3710-G20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e1.0 mL Microcentrifuge Tube Stopper Caps — HDPE, Green, 1000\/Bag (300-3710-G20)\u003c\/h2\u003e\n\u003cp\u003eThese green High-Density Polyethylene stopper caps provide a reliable plug-in friction-fit closure for standard 1.0 mL microcentrifuge tubes, keeping aliquots sealed between centrifuge runs, during refrigerated holds, and throughout routine sample handling workflows. Supplied non-sterile in 1000\/Bag bulk packaging, part number 300-3710-G20 is well-suited to high-throughput molecular biology, biochemistry, and clinical aliquoting programs where per-cap economics and fast visual identification both matter. The green color enables straightforward color-coded batch or sample-type routing in microcentrifuge tube racks without the need for secondary labels.\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\u003e300-3710-G20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Format\u003c\/td\u003e\n\u003ctd\u003e1.0 mL microcentrifuge tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap Style\u003c\/td\u003e\n\u003ctd\u003eStopper — plug-in friction fit\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\u003eGreen\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 Status\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\u003eSealing 1.0 mL microcentrifuge tubes between successive centrifuge spins for pellet and supernatant storage\u003c\/li\u003e\n\u003cli\u003eClosure of enzyme, antibody, and oligonucleotide aliquots in 1.0 mL tubes as a reusable alternative to integrated hinge-caps\u003c\/li\u003e\n\u003cli\u003eColor-coded batch routing — green caps designate a specific sample type or processing group alongside natural or other-colored caps in the same rack\u003c\/li\u003e\n\u003cli\u003eBiorepository sealing of 1.0 mL archive tubes during refrigerated or frozen storage at –20 °C or –80 °C\u003c\/li\u003e\n\u003cli\u003ePre-PCR and pre-qPCR sample holds, keeping reaction tubes sealed before transfer to a PCR plate\u003c\/li\u003e\n\u003cli\u003eClinical chemistry serum and plasma aliquots requiring a secure stopper during transit to the analyzer\u003c\/li\u003e\n\u003cli\u003eReplacement closure for 1.0 mL tubes with lost or damaged integrated hinge-caps\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 \/ serum \/ plasma\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShort-chain alcohols (brief contact)\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDMSO (≤10%)\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage at –20 °C \/ –80 °C\u003c\/td\u003e\n\u003ctd\u003eSuitable — HDPE cryo stability\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave (121 °C)\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConcentrated organic solvents\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 Caplugs® Evergreen's California facility, these stopper caps are manufactured from BPA-free, phthalate-free HDPE resin. The more rigid character of HDPE compared with LDPE provides consistent friction retention in the narrow opening of 1.0 mL microcentrifuge tubes, ensuring a secure seat without the tip-deformation risk associated with softer materials in this format. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from USA inventory; tiered pricing is available for institutional purchasing programs, grant-funded laboratories, and high-volume procurement. We recommend validating stopper-to-tube fit with a sample quantity before committing to a full bulk order, particularly when working with tubes from multiple manufacturers.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these stoppers fit snap-cap (hinge-cap) microcentrifuge tubes from any brand?\u003c\/strong\u003e\u003cbr\u003eThese caps are designed for standard 1.0 mL microcentrifuge tube openings and are intended to seat by friction fit in that tube format. Tube-opening dimensions can vary slightly between manufacturers, so confirming fit with a small trial quantity before bulk purchase is recommended — particularly if your tubes are not a standard HDPE or PP microcentrifuge format.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps suitable for long-term frozen storage at –80 °C?\u003c\/strong\u003e\u003cbr\u003eYes. HDPE maintains adequate flexibility and dimensional stability at –80 °C, making these stoppers suitable for refrigerated and frozen biobank or archival holds. Always ensure the cap is fully seated before placing tubes in the freezer to maintain a reliable seal.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these stopper caps be autoclaved?\u003c\/strong\u003e\u003cbr\u003eHDPE is compatible with standard autoclave cycles at 121 °C, so the caps can be sterilized if your workflow requires it. Keep in mind that the tips themselves are supplied non-sterile, so autoclaving prior to use is the appropriate route when sterile closures are needed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the green (300-3710-G20) and natural (300-3710-020) versions?\u003c\/strong\u003e\u003cbr\u003eBoth caps share the same HDPE stopper specification and fit 1.0 mL microcentrifuge tubes; the only difference is color. Green is commonly used to designate a specific sample type, processing batch, or tube set when visual color-coding across a rack is important. Natural (translucent) caps are the standard option when color differentiation is not required.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"1.0 mL Microcentrifuge Tube Stopper Caps, HDPE, Green — 1000\/Bag\",\"sku\":\"300-3710-G20\",\"mpn\":\"300-3710-G20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Green\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"27.46\",\"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\":\"Will these stoppers fit snap-cap (hinge-cap) microcentrifuge tubes from any brand?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These caps are designed for standard 1.0 mL microcentrifuge tube openings and seat by friction fit. 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