{"product_id":"caplugs-300-3532-r20-hdpe-screw-cap-20ml-vial-30ml-centrifuge-tube-red","title":"20 mL Centrifuge Tubes, Screw Caps, HDPE, Red — 300-3532-R20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e20 mL Vial \u0026amp; 30 mL Centrifuge Tube Screw Caps — HDPE, Red, 1000\/Bag (300-3532-R20)\u003c\/h2\u003e\n\u003cp\u003eThese red High-Density Polyethylene (HDPE) screw caps from Caplugs® Evergreen are designed to fit 20 mL screw-neck vials and 30 mL centrifuge tubes, supplied non-sterile in convenient 1000\/Bag quantities for high-throughput clinical and research workflows. The red color follows the widely recognized CLSI H3 red-top serum\/no-additive tube convention, making these caps immediately identifiable for serum-containing large-format tubes in clinical chemistry, immunoassay, and serology settings. HDPE construction delivers leak-free IATA P650-compliant closure, -80°C cryogenic stability for biorepository programs, and autoclave compatibility 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\u003e300-3532-R20\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\u003eRed\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 and 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\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 in clinical chemistry, immunoassay, and serology workflows where the red color designates serum\/no-additive specimens per CLSI H3 convention\u003c\/li\u003e\n\u003cli\u003eSecuring 30 mL centrifuge tubes during centrifugation — the threaded engagement retains the cap through centrifuge forces\u003c\/li\u003e\n\u003cli\u003eBiorepository archiving of 20 mL and 30 mL frozen specimens at -80°C, supported by HDPE cryo stability\u003c\/li\u003e\n\u003cli\u003eIATA P650-compliant leak-free closure for compliant transport of primary biological specimens\u003c\/li\u003e\n\u003cli\u003eColor-coded batch routing in multi-specimen processing environments, leveraging the universal clinical recognition of the red-top convention\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 engineered for the Caplugs® Evergreen 20 mL screw-neck vial and 30 mL centrifuge tube families. Procurement managers should note that 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. Before placing a bulk order, validate cap-to-tube thread fit with a sample to confirm compatibility with your current tube stock.\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\u003eDilute acids and bases\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlcohols (ethanol, isopropanol)\u003c\/td\u003e\n\u003ctd\u003eGood — short-term contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMany organic solvents (general)\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChlorinated \/ aromatic solvents\u003c\/td\u003e\n\u003ctd\u003eNot recommended — test before use\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\u003eAutoclaving (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 HDPE screw caps are produced from BPA-free, phthalate-free resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with tiered volume pricing available for clinical labs, hospitals, biorepositories, and research institutions purchasing at scale.\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 designed for 20 mL screw-neck vials and 30 mL centrifuge tubes. The 300-3010 and 300-3022 families serve the 15 mL tube format and are not interchangeable with these caps. Always validate thread fit with a sample before committing to a bulk order.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps suitable for frozen biorepository storage?\u003c\/strong\u003e\u003cbr\u003eYes. HDPE maintains its dimensional stability and sealing integrity down to -80°C, making part number 300-3532-R20 appropriate for long-term frozen archiving of serum, plasma, and other biological specimens in 20 mL and 30 mL tube formats.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps compliant for shipping biological specimens?\u003c\/strong\u003e\u003cbr\u003eYes. These screw caps provide an IATA P650-compliant leak-free closure, meeting the primary container sealing requirements for compliant transport of biological specimens.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy choose red caps specifically?\u003c\/strong\u003e\u003cbr\u003eRed mirrors the CLSI H3 red-top serum\/no-additive tube convention — the most universally recognized clinical tube color for serum-containing specimens in clinical chemistry, immunoassay, and serology. Using red caps on large-format 20 mL and 30 mL tubes extends that familiar color vocabulary to high-volume specimen workflows, reducing sorting errors without additional staff retraining. If your laboratory uses a different color-routing system, the 300-3532 range is available in multiple additional solid colors with an identical HDPE thread specification.\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, Red — 1000\/Bag\",\"sku\":\"300-3532-R20\",\"mpn\":\"300-3532-R20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Red\",\"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 designed for 20 mL screw-neck vials and 30 mL centrifuge tubes. The 300-3010 and 300-3022 families serve the 15 mL tube format and are not interchangeable with these caps. Always validate thread fit with a sample before committing to a bulk order.\"}},{\"@type\":\"Question\",\"name\":\"Are these caps suitable for frozen biorepository storage?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. HDPE maintains its dimensional stability and sealing integrity down to -80°C, making these caps appropriate for long-term frozen archiving of serum, plasma, and other biological specimens in 20 mL and 30 mL tube formats.\"}},{\"@type\":\"Question\",\"name\":\"Are these caps compliant for shipping biological specimens?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. These screw caps provide an IATA P650-compliant leak-free closure, meeting the primary container sealing requirements for compliant transport of biological specimens.\"}},{\"@type\":\"Question\",\"name\":\"Why choose red caps specifically?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Red mirrors the CLSI H3 red-top serum\/no-additive tube convention — the most universally recognized clinical tube color for serum-containing specimens in clinical chemistry, immunoassay, and serology. Using red caps on large-format 20 mL and 30 mL tubes extends that familiar color vocabulary to high-volume specimen workflows, reducing sorting errors without additional staff retraining. 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