{"product_id":"caplugs-300-3541-l20-hdpe-screw-cap-50ml-centrifuge-tube-lavender","title":"50 mL Centrifuge Tubes, Screw Caps, HDPE, Lavender, Falcon® Compatible — 300-3541-L20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e50 mL Centrifuge Tube Screw Caps — HDPE, Lavender, 1000\/Bag | Falcon® Compatible (300-3541-L20)\u003c\/h2\u003e\n\u003cp\u003eThese lavender High-Density Polyethylene (HDPE) screw caps are designed for 50 mL centrifuge tubes and supplied in bulk 1000\/Bag packaging for high-throughput clinical and research workflows. The lavender color mirrors the CLSI H3 lavender-top EDTA anticoagulant convention, making them ideal for color-coded routing of large-volume EDTA-preserved specimens such as molecular panels, HbA1c correlation studies, and DNA banking. Built for demanding environments, part number 300-3541-L20 delivers IATA P650-compliant leak-free closure, –80 °C cryogenic stability, and autoclave compatibility at 121 °C.\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\u003e300-3541-L20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap Type\u003c\/td\u003e\n\u003ctd\u003eScrew cap — threaded engagement\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\u003eLavender\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Compatibility\u003c\/td\u003e\n\u003ctd\u003eCaplugs® Evergreen 50 mL centrifuge tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Note\u003c\/td\u003e\n\u003ctd\u003e50 mL format only — larger than 300-3532 (20\/30 mL) and 300-3010\/300-3022 (15 mL) families; not interchangeable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIATA P650\u003c\/td\u003e\n\u003ctd\u003eCompliant — leak-free primary container seal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCryogenic Storage\u003c\/td\u003e\n\u003ctd\u003eCompatible to –80 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave Compatibility\u003c\/td\u003e\n\u003ctd\u003e121 °C \/ 15 psi\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 \/ 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\u003e\n\u003cstrong\u003eLarge-volume specimen sealing:\u003c\/strong\u003e IATA P650-compliant closure for high-volume serum, plasma, and urine in 50 mL tube formats\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEDTA-preserved molecular specimens:\u003c\/strong\u003e Lavender color-coding supports visual routing of molecular panels, HbA1c correlation studies, and large-volume EDTA-preserved batches following CLSI H3 conventions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDNA\/RNA extraction prep:\u003c\/strong\u003e Replaces or supplements caps on 50 mL nucleic acid extraction tubes across high-volume workflows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenomics and biorepository banking:\u003c\/strong\u003e HDPE cryo stability at –80 °C makes these caps suitable for long-term large-volume DNA\/RNA biobank archiving\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugation (capped):\u003c\/strong\u003e Secure screw-thread engagement retains the cap through centrifuge forces during sample separation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCell culture harvest:\u003c\/strong\u003e HDPE is compatible with common culture media formulations used in 50 mL tube harvest workflows\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor-coded batch routing:\u003c\/strong\u003e Available in nine colors across the 300-3541 range, covering primary clinical specimen-type routing conventions\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThese caps are designed to fit Caplugs® Evergreen 50 mL centrifuge tubes and are compatible with Falcon®-format 50 mL centrifuge tubes sharing the same neck thread geometry. The 300-3541 thread specification is unique to the 50 mL format and is distinctly larger than both the 300-3532 family (20\/30 mL tubes) and the 300-3010\/300-3022 family (15 mL tubes) — the three cap families are not interchangeable. Validate cap-to-tube thread fit with a sample quantity before committing to a bulk purchase, particularly when replacing caps on tubes from other manufacturers.\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 \/ saline\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute acids and bases\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlcohols (ethanol, isopropanol)\u003c\/td\u003e\n\u003ctd\u003eGood — suitable for most lab concentrations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMany organic solvents (esters, ketones at low concentration)\u003c\/td\u003e\n\u003ctd\u003eGood — verify with specific reagent before extended contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents (chloroform, methylene chloride)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic solvents (toluene, xylene)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCryogenic storage (–80 °C)\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave (121 °C \/ 15 psi)\u003c\/td\u003e\n\u003ctd\u003eCompatible\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 Caplugs® Evergreen centrifuge tube caps are manufactured in California from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. The HDPE formulation meets the requirements for IATA P650 leak-proof primary container closures, supporting compliant specimen transport. LabSupplies.com is an authorized dealer of Caplugs® Evergreen consumables and ships from USA inventory, with tiered pricing available for high-volume institutional, clinical, and grant-funded laboratory purchasers.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these caps fit my existing 50 mL Falcon® tubes?\u003c\/strong\u003e\u003cbr\u003eThese caps are designed for Caplugs® Evergreen 50 mL centrifuge tubes and are compatible with Falcon®-format tubes sharing the same 50 mL neck thread geometry. Because thread dimensions can vary by manufacturer and tube generation, we strongly recommend verifying fit with a sample before placing a bulk order.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these caps be used at –80 °C for long-term biobanking?\u003c\/strong\u003e\u003cbr\u003eYes — HDPE maintains its structural integrity and thread seal at ultra-low temperatures down to –80 °C, making these caps suitable for cryogenic biorepository storage of large-volume specimens and nucleic acid archives.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps autoclavable?\u003c\/strong\u003e\u003cbr\u003eYes — HDPE is autoclavable at 121 °C \/ 15 psi, allowing sterilization of capped tubes before use in sterility-sensitive workflows such as cell culture.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy are these caps lavender, and are other colors available?\u003c\/strong\u003e\u003cbr\u003eLavender mirrors the CLSI H3 lavender-top EDTA anticoagulant tube convention, providing intuitive color-coded routing for EDTA-preserved molecular specimens in 50 mL formats. The 300-3541 range is available in nine colors — including natural, blue, orange, and green — all sharing the same HDPE thread specification so labs can standardize on a single cap family across multiple specimen types.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"50 mL Centrifuge Tube Screw Caps, HDPE, Lavender, 1000\/Bag — Falcon® Compatible\",\"sku\":\"300-3541-L20\",\"mpn\":\"300-3541-L20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Lavender\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"115.50\",\"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\":\"Will these caps fit my existing 50 mL Falcon® tubes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These caps are designed for Caplugs® Evergreen 50 mL centrifuge tubes and are compatible with Falcon®-format tubes sharing the same 50 mL neck thread geometry. Because thread dimensions can vary by manufacturer and tube generation, we strongly recommend verifying fit with a sample before placing a bulk order.\"}},{\"@type\":\"Question\",\"name\":\"Can these caps be used at –80 °C for long-term biobanking?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — HDPE maintains its structural integrity and thread seal at ultra-low temperatures down to –80 °C, making these caps suitable for cryogenic biorepository storage of large-volume specimens and nucleic acid archives.\"}},{\"@type\":\"Question\",\"name\":\"Are these caps autoclavable?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — HDPE is autoclavable at 121 °C \/ 15 psi, allowing sterilization of capped tubes before use in sterility-sensitive workflows such as cell culture.\"}},{\"@type\":\"Question\",\"name\":\"Why are these caps lavender, and are other colors available?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Lavender mirrors the CLSI H3 lavender-top EDTA anticoagulant tube convention, providing intuitive color-coded routing for EDTA-preserved molecular specimens in 50 mL formats. The 300-3541 range is available in nine colors — including natural, blue, orange, and green — all sharing the same HDPE thread specification so labs can standardize on a single cap family across multiple specimen types.\"}}]}\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48567928094952,"sku":"300-3541-L20","price":115.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-3541-L20_02.jpg?v=1779074082","url":"https:\/\/labsupplies.com\/products\/caplugs-300-3541-l20-hdpe-screw-cap-50ml-centrifuge-tube-lavender","provider":"LabSupplies.com","version":"1.0","type":"link"}