{"product_id":"caplugs-300-3541-w20-hdpe-screw-cap-50ml-centrifuge-tube-white","title":"50 mL Centrifuge Tubes, Screw Caps, HDPE, White, Falcon® Compatible — 300-3541-W20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e50 mL Centrifuge Tube Screw Caps — HDPE, White, 1000\/Bag (Falcon® Compatible, 300-3541-W20)\u003c\/h2\u003e\n\u003cp\u003eThese white High-Density Polyethylene (HDPE) screw caps are designed for 50 mL centrifuge tubes and supplied in convenient 1000\/Bag quantities for high-throughput clinical and research environments. The white surface delivers the highest-contrast background for adhesive and printed barcode labels, making these caps the preferred choice for biorepository, genomics, and LIS-driven specimen-routing programs where label readability on archived 50 mL tubes is paramount. Each cap provides a leak-free threaded closure rated for IATA P650 transport, -80°C cryogenic storage, and autoclave sterilization 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-W20\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\u003eWhite\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 thread only — larger than 300-3532 (20\/30 mL) and 300-3010\/300-3022 (15 mL); not interchangeable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIATA P650\u003c\/td\u003e\n\u003ctd\u003eYes — 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; phthalate-free\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\u003eCapping 50 mL centrifuge tubes for large-volume serum, plasma, and urine specimen transport under IATA P650 requirements\u003c\/li\u003e\n\u003cli\u003eBiorepository and biobank archiving of 50 mL tubes at -80°C ultra-low temperature\u003c\/li\u003e\n\u003cli\u003eColor-coded batch routing across clinical departments — white maximizes barcode label readability for LIS-generated tube labels\u003c\/li\u003e\n\u003cli\u003eCapped centrifugation for plasma or cell-culture harvest in 50 mL format\u003c\/li\u003e\n\u003cli\u003eHigh-volume DNA\/RNA extraction prep and genomics banking in 50 mL tubes\u003c\/li\u003e\n\u003cli\u003eAutoclaving capped tubes at 121°C for sterile media or buffer preparation workflows\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, which share thread geometry with standard 50 mL conical tube formats including Falcon® 50 mL tubes. The 300-3541 thread is specific to the 50 mL tube neck and is intentionally larger than both the 300-3532 cap family (20\/30 mL tubes) and the 300-3010\/300-3022 cap family (15 mL tubes) — the three families are not interchangeable. If you are transitioning from OEM caps, validate fit with a sample lot before committing to bulk purchase. The same HDPE thread specification is shared across all nine colors in the 300-3541 range, so labs running multi-color routing schemes can stock multiple colors with confidence in uniform fit.\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\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 short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMany organic solvents (non-aromatic, non-chlorinated)\u003c\/td\u003e\n\u003ctd\u003eGood\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\u003eChlorinated solvents (chloroform, DCM)\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 at Caplugs® Evergreen's California facility, these caps are produced from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from USA inventory, enabling same-business-day dispatch on stocking items. Volume and institutional pricing tiers are available for hospitals, biorepositories, and grant-funded research programs — contact our sales team for a quote on multi-bag or contract orders.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these caps fit my existing Falcon® 50 mL centrifuge tubes?\u003c\/strong\u003e\u003cbr\u003eThese caps are designed to fit Caplugs® Evergreen 50 mL centrifuge tubes, which share thread geometry with standard 50 mL conical formats such as Falcon® tubes. Because minor thread tolerances can vary between manufacturers, we recommend validating fit with a sample before switching from OEM caps in bulk workflows.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these caps be autoclaved?\u003c\/strong\u003e\u003cbr\u003eYes. The HDPE construction is compatible with standard autoclave cycles at 121°C and 15 psi, making these caps suitable for sterile media preparation and other workflows requiring heat sterilization.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy choose white caps over other available colors?\u003c\/strong\u003e\u003cbr\u003eWhite provides the highest-contrast surface for adhesive and printed barcode labels, which is why biorepository, genomics, and LIS-driven programs often prefer it for 50 mL tube archives where label readability is critical. The 300-3541 range is also available in eight additional colors — including Natural, Blue, Orange, and Green — if your lab uses color coding for specimen-type or department routing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps compatible with the 15 mL and 20\/30 mL cap families?\u003c\/strong\u003e\u003cbr\u003eNo. The 300-3541 thread is sized specifically for 50 mL tube necks and is larger than both the 300-3532 family (20\/30 mL) and the 300-3010\/300-3022 family (15 mL). These three cap families are not interchangeable, so verify you are ordering the correct format for your tube size.\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, White, 1000\/Bag — Falcon® Compatible\",\"sku\":\"300-3541-W20\",\"mpn\":\"300-3541-W20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"White\",\"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 Falcon® 50 mL centrifuge tubes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These caps are designed to fit Caplugs® Evergreen 50 mL centrifuge tubes, which share thread geometry with standard 50 mL conical formats such as Falcon® tubes. 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