{"product_id":"caplugs-300-3532-g20-hdpe-screw-cap-20ml-vial-30ml-centrifuge-tube-green","title":"20 mL Centrifuge Tubes, Screw Caps, HDPE, Green — 300-3532-G20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e20 mL Vial \u0026amp; 30 mL Centrifuge Tube Screw Caps — HDPE, Green, 1000\/Bag (300-3532-G20)\u003c\/h2\u003e\n\u003cp\u003eThese green High-Density Polyethylene screw caps from Caplugs® Evergreen are designed to fit 20 mL screw-neck vials and 30 mL centrifuge tubes, providing a leak-free threaded closure for clinical, biorepository, and field-collection workflows. Supplied non-sterile in convenient 1000\/Bag quantities, the 300-3532-G20 supports IATA P650 compliant biological specimen transport, ultra-low temperature storage to -80°C, and autoclave sterilization at 121°C — making these caps versatile across the full specimen life cycle.\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\u003e300-3532-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 20 mL screw-neck vials; 30 mL centrifuge tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThread Note\u003c\/td\u003e\n\u003ctd\u003eLarger thread than 300-3010\/300-3022 (15 mL cap family) — 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\u003eCompatible (121°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\u003eBPA \/ Phthalates\u003c\/td\u003e\n\u003ctd\u003eBPA-free; no phthalate plasticizers\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 (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 20 mL screw-neck vials for serum, plasma, urine, or other clinical specimens prior to transport or archiving\u003c\/li\u003e\n\u003cli\u003eSecuring 30 mL centrifuge tubes during centrifugation for serum separation or cell pelleting — threaded engagement retains the cap through centrifuge forces\u003c\/li\u003e\n\u003cli\u003eIATA P650 compliant biological specimen transport in leak-proof primary containers\u003c\/li\u003e\n\u003cli\u003eUltra-low temperature biorepository archiving of large-format tubes at -80°C cryo storage conditions\u003c\/li\u003e\n\u003cli\u003eColor-coded batch and specimen-type routing in multi-analyte or multi-site clinical laboratories — green designates a specific category within a 15-color system\u003c\/li\u003e\n\u003cli\u003eCell culture in 30 mL tubes where HDPE is compatible with standard culture media formulations\u003c\/li\u003e\n\u003cli\u003eEnvironmental sampling with large-volume field collection tubes requiring chemically inert closures\u003c\/li\u003e\n\u003cli\u003eReplacement cap program for existing 20 mL vial or 30 mL centrifuge tube inventory with matching Caplugs® thread geometry\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThese caps are engineered to fit Caplugs® Evergreen 20 mL screw-neck vials and the 30 mL centrifuge tube family. The 300-3532 series uses a larger thread specification than the 300-3010 and 300-3022 cap families designed for 15 mL tubes — the two families are not interchangeable. If you are sourcing replacement caps for an existing inventory of Caplugs® 20 mL vials or 30 mL centrifuge tubes, these caps will match the thread geometry precisely. Always validate fit with a sample quantity before committing to a bulk purchase if you are unsure of your tube format.\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, water\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, methanol)\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnvironmental matrices (water, soil eluates)\u003c\/td\u003e\n\u003ctd\u003eExcellent\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\u003eAromatic solvents (toluene, xylene)\u003c\/td\u003e\n\u003ctd\u003eNot recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave (121°C \/ 15 psi steam)\u003c\/td\u003e\n\u003ctd\u003eCompatible\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\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 screw caps are manufactured from BPA-free, phthalate-free HDPE resin under ISO quality management standards. All 15 colors in the 300-3532 series share identical material specification and thread geometry — only the color varies — so procurement teams can standardize on a single part family for multi-color routing systems without qualifying separate materials. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with tiered pricing available for high-volume institutional, clinical, and biorepository accounts.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these caps fit my existing 15 mL centrifuge tubes?\u003c\/strong\u003e\u003cbr\u003eNo. The 300-3532 series uses a larger thread specification than the 300-3010 and 300-3022 cap families, which are designed for 15 mL tubes. These green caps are compatible only with Caplugs® Evergreen 20 mL screw-neck vials and 30 mL centrifuge tubes. If you are unsure of your tube format, request a sample quantity to verify fit before placing a bulk order.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps suitable for transporting infectious or diagnostic specimens?\u003c\/strong\u003e\u003cbr\u003eYes — these caps provide an IATA P650 compliant leak-free closure when properly threaded onto compatible Caplugs® Evergreen vials or centrifuge tubes, making them appropriate for regulated biological specimen transport.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these caps be autoclaved for sterile supply preparation?\u003c\/strong\u003e\u003cbr\u003eYes. The HDPE material is compatible with standard autoclave cycles at 121°C \/ 15 psi. Note that the caps are supplied non-sterile from the factory, so autoclave sterilization must be performed by your facility if sterile closures are required for your application.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy are 15 different cap colors available in the 300-3532 range?\u003c\/strong\u003e\u003cbr\u003eColor coding is widely used in clinical and research laboratories to differentiate specimen types, processing batches, collection sites, or priority levels at a glance — reducing routing errors without additional labeling. All 15 colors in the 300-3532 series share the same HDPE material and thread geometry, so a single procurement decision covers an entire color-coded workflow.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"20 mL Vial \u0026 30 mL Centrifuge Tube Screw Caps, HDPE, Green, 1000\/Bag — Caplugs® Evergreen 300-3532-G20\",\"sku\":\"300-3532-G20\",\"mpn\":\"300-3532-G20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Green\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"114.28\",\"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 15 mL centrifuge tubes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. The 300-3532 series uses a larger thread specification than the 300-3010 and 300-3022 cap families, which are designed for 15 mL tubes. 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