{"product_id":"caplugs-300-3532-u20-hdpe-screw-cap-20ml-vial-30ml-centrifuge-tube-purple","title":"20 mL Centrifuge Tubes, Screw Caps, HDPE, Purple — 300-3532-U20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e20 mL Vial \u0026amp; 30 mL Centrifuge Tube Screw Caps — HDPE, Purple, 1000\/Bag (300-3532-U20)\u003c\/h2\u003e\n\u003cp\u003eThese purple High-Density Polyethylene (HDPE) screw caps are engineered to fit Caplugs® Evergreen 20 mL screw-neck vials and 30 mL centrifuge tubes, delivering a leak-free threaded closure that meets IATA P650 transport requirements. Supplied non-sterile in bags of 1000, they support -80°C biorepository storage and autoclave sterilization at 121°C, making them versatile across clinical, research, and biobank workflows. The purple color adds a distinct routing dimension for labs where standard CLSI convention colors are already allocated to primary tube categories.\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-U20\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\u003ePurple\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 — 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\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\u003eCapping Caplugs® Evergreen 20 mL screw-neck vials for primary specimen collection and transport\u003c\/li\u003e\n\u003cli\u003eSecuring 30 mL centrifuge tubes through centrifugation cycles — threaded engagement retains the cap under centrifuge forces\u003c\/li\u003e\n\u003cli\u003eColor-coded batch routing in clinical labs where primary CLSI convention colors are already assigned; purple designates specialized sub-type batches, overflow accession categories, or specific anatomic site collections\u003c\/li\u003e\n\u003cli\u003eBiorepository archiving of 20 mL and 30 mL frozen specimens at -80°C\u003c\/li\u003e\n\u003cli\u003eIATA P650 compliant leak-free closure for regulated transport of infectious or diagnostic specimens\u003c\/li\u003e\n\u003cli\u003eReplacement cap supply for existing Caplugs® Evergreen 20 mL vial and 30 mL centrifuge tube inventory\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThese caps are designed exclusively for the Caplugs® Evergreen 20 mL screw-neck vial and 30 mL centrifuge tube families. The 300-3532 series uses a larger thread specification than the 300-3010 and 300-3022 cap families used with 15 mL tubes — the two thread sizes are not interchangeable. Validate cap-to-tube thread fit with a sample quantity before placing a bulk order, particularly when transitioning from an existing cap supplier or consolidating tube formats. Purple is one of 14 solid colors available in the 300-3532 range; all share the identical HDPE thread specification, so color is the only variable between SKUs in this family.\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMany organic solvents\u003c\/td\u003e\n\u003ctd\u003eGood — verify with concentrated or prolonged exposure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated solvents (chloroform, DCM)\u003c\/td\u003e\n\u003ctd\u003eLimited — not recommended for long-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic solvents (toluene, xylene)\u003c\/td\u003e\n\u003ctd\u003eLimited — not recommended for long-term contact\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 (California), these Caplugs® Evergreen screw caps are manufactured from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management standards. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with same-business-day fulfillment available on stocking items. Tiered volume pricing is available for high-throughput clinical laboratories, hospital systems, biobanks, and grant-funded research programs — contact our team for institutional and blanket-order arrangements.\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 families, which are sized for 15 mL tubes. The two thread sizes are not interchangeable — confirm your tube format before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps autoclavable?\u003c\/strong\u003e\u003cbr\u003eYes. The HDPE construction is compatible with standard autoclave cycles at 121°C \/ 15 psi, making them suitable for workflows that require sterilized closures.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these caps be used for frozen biorepository storage?\u003c\/strong\u003e\u003cbr\u003eYes. HDPE maintains its structural integrity and thread seal down to -80°C, making part number 300-3532-U20 appropriate for long-term cryogenic archiving of specimens in 20 mL vials and 30 mL centrifuge tubes.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy choose purple over other available colors in this cap family?\u003c\/strong\u003e\u003cbr\u003ePurple provides an additional color dimension in labs where the more common CLSI convention colors — such as red, green, yellow, and lavender — are already assigned to primary tube categories. It is commonly used for specialized sub-type batches, overflow accession groups, or site-specific collection programs, enabling visual differentiation at a glance without relabeling tubes.\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, Purple, 1000\/Bag — Caplugs® Evergreen 300-3532-U20\",\"sku\":\"300-3532-U20\",\"mpn\":\"300-3532-U20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Purple\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"114.28\",\"availability\":\"https:\/\/schema.org\/InStock\"}}\u003c\/script\u003e\n\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 families, which are sized for 15 mL tubes. 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