{"product_id":"caplugs-300-3541-g20-hdpe-screw-cap-50ml-centrifuge-tube-green","title":"50 mL Centrifuge Tubes, Screw Caps, HDPE, Green, Falcon® Compatible — 300-3541-G20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e50 mL Centrifuge Tube Screw Caps — HDPE, Green, Falcon® Compatible, 1000\/Bag (300-3541-G20)\u003c\/h2\u003e\n\u003cp\u003eThese green High-Density Polyethylene (HDPE) screw caps are designed for Caplugs® Evergreen 50 mL centrifuge tubes, supplied non-sterile in a convenient 1000\/Bag pack for high-volume clinical, research, and biorepository workflows. The threaded engagement provides a leak-free primary container seal that meets IATA P650 transport requirements, and the green color enables immediate visual differentiation of specimen types, processing batches, or collection-site categories across centrifuge racks and processing areas. HDPE construction delivers reliable performance from -80°C ultra-low temperature storage through 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-G20\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\u003eGreen\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\u003eColor-coded specimen routing — green caps visually distinguish specific specimen categories, processing rounds, or collection-site types from other tube batches in shared centrifuge racks\u003c\/li\u003e\n\u003cli\u003eLarge-volume serum, plasma, and urine collection and transport with IATA P650 compliant leak-free closure\u003c\/li\u003e\n\u003cli\u003eBiorepository and biobank archiving of 50 mL tubes at -80°C ultra-low temperature storage\u003c\/li\u003e\n\u003cli\u003eCapped centrifugation for sample separation — threaded engagement retains the cap through centrifuge forces\u003c\/li\u003e\n\u003cli\u003eCell culture harvest in 50 mL centrifuge tubes with HDPE compatibility across common culture media formulations\u003c\/li\u003e\n\u003cli\u003eHigh-volume DNA\/RNA extraction prep and genomics banking using 50 mL nucleic acid extraction tubes\u003c\/li\u003e\n\u003cli\u003eReplacement caps for existing 50 mL Caplugs® Evergreen tube programs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThese caps are engineered for the Caplugs® Evergreen 50 mL centrifuge tube format and are compatible with Falcon®-style 50 mL centrifuge tubes sharing the same neck thread geometry. The 300-3541 thread is specific to the 50 mL format and is larger than both the 300-3532 cap family (20\/30 mL tubes) and the 300-3010\/300-3022 cap family (15 mL tubes) — these cap families are not interchangeable. Customers switching from OEM or alternate-brand 50 mL tube caps should validate fit with a sample quantity before committing to bulk purchase. The green cap (300-3541-G20) is one of nine colors available in the 300-3541 range, all sharing identical HDPE thread specification; other available colors include Natural (300-3541-020), Blue (300-3541-B20), Orange (300-3541-E20), and Lavender (300-3541-L20).\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\u003eSerum \/ plasma \/ urine\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\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEthanol and common alcohols\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCulture media formulations\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents (e.g., chloroform)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic solvents (e.g., toluene, xylene)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCryogenic storage (to -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 manufacturing facility, these screw caps are produced from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. The 300-3541-G20 is compliant with IATA P650 requirements for leak-free primary container transport closures, providing confidence for both domestic and international specimen shipment programs. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered volume pricing available for hospitals, clinical reference laboratories, biotech companies, and research institutions placing recurring or high-volume orders.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these caps fit Falcon® 50 mL centrifuge tubes?\u003c\/strong\u003e\u003cbr\u003eThese caps are compatible with Falcon®-style 50 mL centrifuge tubes that share the standard 50 mL neck thread geometry. Because thread tolerances can vary slightly between manufacturers, we recommend validating fit with a sample quantity before a full bulk purchase.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these caps be autoclaved?\u003c\/strong\u003e\u003cbr\u003eYes — HDPE is autoclavable at 121°C \/ 15 psi, making these caps suitable for workflows that require sterilization of capped tubes or caps alone before use.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps compatible with -80°C freezer storage?\u003c\/strong\u003e\u003cbr\u003eYes — HDPE maintains structural integrity and thread seal integrity down to -80°C, making these caps appropriate for biorepository and biobank archiving in ultra-low temperature freezers.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy are there nine cap colors in the 300-3541 range, and do they all fit the same tubes?\u003c\/strong\u003e\u003cbr\u003eAll nine colors in the 300-3541 family are produced from the same HDPE thread specification and fit the same Caplugs® Evergreen 50 mL centrifuge tube format. The color range exists specifically to support color-coded specimen management programs, allowing labs to visually separate specimen types, processing batches, or collection sites without any additional labeling step.\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, Green, Falcon® Compatible — 1000\/Bag\",\"sku\":\"300-3541-G20\",\"mpn\":\"300-3541-G20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Green\",\"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 Falcon® 50 mL centrifuge tubes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"These caps are compatible with Falcon®-style 50 mL centrifuge tubes that share the standard 50 mL neck thread geometry. 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