{"product_id":"caplugs-300-3900-r2k-cryosure-cryogenic-vial-caps-hdpe-red","title":"Cryo Vial Caps, Screw Caps, HDPE, Red — 300-3900-R2K | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eCryoSure® Cryogenic Vial Screw Caps — HDPE, Red, 1000\/Bag (300-3900-R2K)\u003c\/h2\u003e\n\u003cp\u003eThese red High-Density Polyethylene screw caps from the Caplugs® Evergreen CryoSure® line are engineered for cryogenic vial archiving at temperatures ranging from -196°C liquid nitrogen immersion and vapor phase storage through -80°C mechanical freezer environments, and are also autoclavable at 121°C. Supplied in a 1000\/Bag bulk format, part number 300-3900-R2K is the high-volume procurement choice for biobanks, clinical biorepositories, and cell biology programs that rely on red color-coding to designate serum-derived or other red-class cryogenic vial aliquots.\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\u003e300-3900-R2K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSub-brand\u003c\/td\u003e\n\u003ctd\u003eCryoSure® (Caplugs® Evergreen)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eCryogenic Vial Screw Cap\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\u003eCryogenic Rating\u003c\/td\u003e\n\u003ctd\u003eLN₂ vapor phase and immersion (-196°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFreezer Storage\u003c\/td\u003e\n\u003ctd\u003e-80°C mechanical freezer compatible\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\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\u003eBiobank and biorepository archiving of red color-designated cryogenic vial aliquots in LN₂ vapor phase or immersion storage\u003c\/li\u003e\n\u003cli\u003eClinical laboratory serum sample cryopreservation, where red color-coding aligns with the CLSI H3 red-top serum convention for straightforward specimen identification\u003c\/li\u003e\n\u003cli\u003eCell line cryopreservation using DMSO-based cryoprotective media at standard concentrations (5–10%)\u003c\/li\u003e\n\u003cli\u003e-80°C mechanical freezer biorepository programs requiring a color-coded multi-specimen cap system\u003c\/li\u003e\n\u003cli\u003eHigh-throughput programs using color-coded cryo box systems where consistent cap color reduces retrieval errors across 12 CryoSure® color designations\u003c\/li\u003e\n\u003c\/ul\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\u003eLiquid nitrogen, immersion (-196°C)\u003c\/td\u003e\n\u003ctd\u003eExcellent — engineered for LN₂ vapor and immersion\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStorage at -80°C\u003c\/td\u003e\n\u003ctd\u003eExcellent — HDPE cryo-toughened\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\u003ctr\u003e\n\u003ctd\u003eDMSO (5–10% cryoprotectant concentration)\u003c\/td\u003e\n\u003ctd\u003eGood — standard cryo media concentrations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAqueous cryoprotectants (FBS, glycerol, Bambanker)\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\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\u003eConcentrated organic solvents\u003c\/td\u003e\n\u003ctd\u003eNot recommended\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, every lot of CryoSure® caps is precision-molded from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory. The 1000\/Bag bulk format of this cap offers the lowest per-cap cost in the red CryoSure® range; laboratories wishing to confirm fit and workflow routing before committing to bulk quantities may first order the companion 200\/Bag trial pack (300-3900-R20). Tiered pricing is available for institutional, hospital system, and federally funded procurement programs.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these caps rated for liquid nitrogen immersion, or only vapor phase?\u003c\/strong\u003e\u003cbr\u003eBoth. CryoSure® HDPE screw caps are rated for LN₂ vapor phase storage at -196°C as well as full LN₂ immersion, in addition to -80°C mechanical freezer archiving.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat vials do these caps fit?\u003c\/strong\u003e\u003cbr\u003eThese caps are designed for use with CryoSure® cryogenic vials. If you are using vials from another manufacturer, confirm thread compatibility before placing a bulk order — the 200\/Bag trial pack (300-3900-R20) is available for fit verification.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy are the caps red, and does the color have a functional meaning?\u003c\/strong\u003e\u003cbr\u003eRed CryoSure® caps mirror the CLSI H3 red-top serum convention, making them the standard choice for programs that color-code serum-derived cryogenic vial aliquots. CryoSure® caps are available in 12 colors to support multi-specimen color-coded archiving systems.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these caps be autoclaved for sterile applications?\u003c\/strong\u003e\u003cbr\u003eYes — HDPE CryoSure® caps are compatible with standard autoclave cycles at 121°C \/ 15 psi, supporting workflows that require sterile cap inventory before cryogenic vial filling.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"CryoSure® Cryogenic Vial Screw Caps, HDPE, Red, 1000\/Bag — 300-3900-R2K\",\"sku\":\"300-3900-R2K\",\"mpn\":\"300-3900-R2K\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"Red\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"84.87\",\"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\":\"Are these caps rated for liquid nitrogen immersion, or only vapor phase?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Both. 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