{"product_id":"caplugs-300-3532-l20-hdpe-screw-cap-20ml-vial-30ml-centrifuge-tube-lavender","title":"20 mL Centrifuge Tubes, Screw Caps, HDPE, Lavender — 300-3532-L20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e20 mL Vial \u0026amp; 30 mL Centrifuge Tube Screw Caps — HDPE, Lavender, 1000\/Bag (300-3532-L20)\u003c\/h2\u003e\n\u003cp\u003eThese lavender High-Density Polyethylene screw caps are engineered to fit Caplugs® Evergreen 20 mL screw-neck vials and 30 mL centrifuge tubes, supplied non-sterile in convenient 1000\/Bag packs for high-throughput laboratory and biorepository workflows. The lavender color mirrors the CLSI H3 lavender-top EDTA anticoagulant convention, making these caps ideal for visually routing large-volume EDTA-preserved specimens — such as those used in molecular testing, HbA1c correlation studies, and CBC reference programs — without process retraining. Part number 300-3532-L20 is one of 15 colors in the 300-3532 range, all sharing identical HDPE material and thread geometry.\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-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 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\u003eSterility\u003c\/td\u003e\n\u003ctd\u003eNon-Sterile\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\u003eIATA P650 Compliance\u003c\/td\u003e\n\u003ctd\u003eLeak-free primary container seal\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 Caplugs® Evergreen 20 mL screw-neck vials for specimen storage and transport\u003c\/li\u003e\n\u003cli\u003eSealing 30 mL centrifuge tubes for serum or cell separation spins, with threaded engagement retaining the cap through centrifuge forces\u003c\/li\u003e\n\u003cli\u003eIATA P650 compliant closure for biological specimen transport in 20 mL and 30 mL tube formats\u003c\/li\u003e\n\u003cli\u003eLarge-volume EDTA specimen routing (molecular diagnostics, HbA1c correlation, CBC reference studies) using lavender color coding per CLSI H3 convention\u003c\/li\u003e\n\u003cli\u003eBiorepository archiving of large-format tubes at -20°C and -80°C ultra-low temperature\u003c\/li\u003e\n\u003cli\u003eCell culture incubation in 30 mL tubes — HDPE is compatible with standard culture media formulations\u003c\/li\u003e\n\u003cli\u003eEnvironmental and field sampling where chemical inertness to water and soil matrices is required\u003c\/li\u003e\n\u003cli\u003eReplacement cap programs for existing 20 mL vial and 30 mL tube inventory — thread specification matches Caplugs® Evergreen 20\/30 mL tube family\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThese caps are designed specifically for Caplugs® Evergreen 20 mL screw-neck vials and 30 mL centrifuge tubes. The 300-3532 thread specification is larger than that of the 300-3010 and 300-3022 families used with 15 mL tubes, and the two thread sizes are not interchangeable. Laboratories sourcing replacement caps for existing 20 mL or 30 mL Caplugs® Evergreen tube inventory should confirm tube format before placing a bulk order — validate cap-to-tube thread fit with a sample quantity first.\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\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 (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\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 (California), these Caplugs® Evergreen caps are produced from BPA-free, phthalate-free HDPE resin and meet IATA P650 requirements for leak-free primary container seals in biological specimen transport. The lavender color is consistent across the full 300-3532 fifteen-color range, with all variants sharing identical material specification and thread geometry — color is the only variable, simplifying inventory management across multi-color routing programs. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from USA inventory, with tiered pricing available for high-volume institutional 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 designed for 15 mL tubes. These caps are sized for Caplugs® Evergreen 20 mL screw-neck vials and 30 mL centrifuge tubes only. Confirm your tube format and validate fit with a sample before bulk ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps suitable for ultra-low temperature biorepository storage?\u003c\/strong\u003e\u003cbr\u003eYes. HDPE maintains dimensional stability and seal integrity at -20°C and -80°C, making these caps appropriate for large-format tube archiving in biorepository programs.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy are the caps lavender — is there a functional reason beyond color coding?\u003c\/strong\u003e\u003cbr\u003eThe lavender color mirrors the CLSI H3 lavender-top EDTA anticoagulant convention. In clinical and research labs handling large-volume EDTA-preserved specimens (molecular assays, HbA1c correlation studies, CBC reference work), lavender cap color provides immediate visual routing without additional labeling. All 15 colors in the 300-3532 range share identical HDPE material and thread geometry — color is the sole differentiator.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these caps be autoclaved for pre-sterilized supply chains?\u003c\/strong\u003e\u003cbr\u003eYes. HDPE is autoclave-compatible at 121°C \/ 15 psi, so caps can be sterilized prior to use in workflows that require a pre-sterilized closure. Note that caps are supplied non-sterile as shipped.\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, Lavender — 1000\/Bag\",\"sku\":\"300-3532-L20\",\"mpn\":\"300-3532-L20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Lavender\",\"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 designed for 15 mL tubes. These caps are sized for Caplugs® Evergreen 20 mL screw-neck vials and 30 mL centrifuge tubes only. Confirm your tube format and validate fit with a sample before bulk ordering.\"}},{\"@type\":\"Question\",\"name\":\"Are these caps suitable for ultra-low temperature biorepository storage?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. HDPE maintains dimensional stability and seal integrity at -20°C and -80°C, making these caps appropriate for large-format tube archiving in biorepository programs.\"}},{\"@type\":\"Question\",\"name\":\"Why are the caps lavender — is there a functional reason beyond color coding?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The lavender color mirrors the CLSI H3 lavender-top EDTA anticoagulant convention. In clinical and research labs handling large-volume EDTA-preserved specimens, lavender cap color provides immediate visual routing without additional labeling. 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