{"product_id":"caplugs-300-3541-b20-50-ml-centrifuge-tube-screw-caps","title":"50 mL Centrifuge Tubes, HDPE, Blue — 300-3541-B20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e50 mL Centrifuge Tube Screw Caps — HDPE, Blue, Non-Sterile, 1000\/Bag (300-3541-B20)\u003c\/h2\u003e\n\u003cp\u003eThese replacement screw caps are designed to fit standard 50 mL centrifuge tubes, molded from high-density polyethylene (HDPE) in a distinctive blue color for quick visual identification. Supplied non-sterile in bulk (1000\/Bag), part number 300-3541-B20 is well suited for high-throughput laboratories that routinely replace, restock, or color-code tube closures. The rigid HDPE construction provides a secure, leak-resistant seal for everyday sample storage and centrifugation workflows.\u003c\/p\u003e\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-B20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIntended Tube Size\u003c\/td\u003e\n\u003ctd\u003e50 mL Centrifuge Tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure Type\u003c\/td\u003e\n\u003ctd\u003eScrew Cap\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\u003eBlue\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\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\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eReplacing lost or damaged caps on 50 mL centrifuge tubes in routine laboratory workflows\u003c\/li\u003e\n\u003cli\u003eColor-coded sample organization and tube identification across multiple studies or sample sets\u003c\/li\u003e\n\u003cli\u003eBulk restocking of centrifuge tube closures for high-volume clinical and research environments\u003c\/li\u003e\n\u003cli\u003eSecure capping of tubes during low- to moderate-speed centrifugation and sample storage\u003c\/li\u003e\n\u003cli\u003eGeneral specimen and reagent containment in biological, chemical, and environmental labs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eMaterial \u0026amp; Chemical Resistance\u003c\/h2\u003e\n\u003cp\u003eHigh-density polyethylene offers broad resistance to aqueous solutions, dilute acids and bases, and many common laboratory reagents, making it a reliable choice for general sample storage and handling. HDPE is more rigid than low-density polyethylene and maintains its shape under normal screw-cap torque. Note that HDPE is not recommended for autoclave sterilization, and compatibility should be verified before use with concentrated oxidizing acids, aromatic solvents, or halogenated solvents.\u003c\/p\u003e\n\u003ch2\u003eQuality \u0026amp; Procurement\u003c\/h2\u003e\n\u003cp\u003eMade in USA, Caplugs® Evergreen screw caps are manufactured under ISO 9001 quality management from BPA-free, phthalate-free, latex-free resin. LabSupplies.com is an authorized dealer and ships from USA inventory, typically same business day for stocking items, with tiered pricing available for institutional and grant-funded laboratories.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these screw caps sterile?\u003c\/strong\u003e\u003cbr\u003eNo — they are supplied non-sterile in 1000\/Bag bulk packaging. Laboratories requiring sterile closures should consider a separate sterilization step or select a sterile product offering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these caps be autoclaved?\u003c\/strong\u003e\u003cbr\u003eHDPE is generally not recommended for autoclave sterilization, as the elevated temperature and steam pressure can distort the material. For applications requiring sterile closures, chemical sterilization or gamma-irradiated alternatives should be considered.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat chemical types are compatible with HDPE screw caps?\u003c\/strong\u003e\u003cbr\u003eHDPE performs well with aqueous samples, dilute acids and bases, and many common buffers and biological reagents. Compatibility should be verified before use with concentrated oxidizing acids, aromatic solvents, or chlorinated solvents, which can degrade polyethylene.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"50 mL Centrifuge Tube Screw Caps, HDPE, Blue, Non-Sterile, 1000\/Bag\",\"sku\":\"3003541B20E1\",\"mpn\":\"300-3541-B20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Blue\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"92.40\",\"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 screw caps sterile?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No — they are supplied non-sterile in 1000\/Bag bulk packaging. 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Compatibility should be verified before use with concentrated oxidizing acids, aromatic solvents, or chlorinated solvents, which can degrade polyethylene.\"}}]}\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48580045537512,"sku":"3003541B20E1","price":110.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-3541-B20.png?v=1779410289","url":"https:\/\/labsupplies.com\/products\/caplugs-300-3541-b20-50-ml-centrifuge-tube-screw-caps","provider":"LabSupplies.com","version":"1.0","type":"link"}