{"product_id":"caplugs-300-3910-fw20-mst-flat-top-cryo-vial-caps-hdpe-white","title":"Vial Caps, HDPE, White — 300-3910-FW20 | 200\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eMST™ Flat-Top Cryogenic Vial Caps — HDPE, White, 200\/Bag (300-3910-FW20)\u003c\/h2\u003e\n\u003cp\u003eThese Caplugs® Evergreen MST™ flat-top cryogenic vial caps are molded from high-density polyethylene (HDPE) in white and are rated for liquid nitrogen vapor phase and immersion storage down to -196°C as well as -80°C mechanical freezer environments. Supplied 200 caps per bag, part number 300-3910-FW20 is engineered exclusively for MST™ cryogenic vials — the flat-top profile is not interchangeable with CryoSure® dome-top caps or vials. White provides the highest-contrast surface in the MST™ color range for adhesive and LIS-printed barcode labels, making these caps a preferred choice in biorepository and biobank programs where flat-top label readability drives specimen routing.\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\u003e300-3910-FW20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSub-brand\u003c\/td\u003e\n\u003ctd\u003eMST™ (Caplugs® Evergreen)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap Profile\u003c\/td\u003e\n\u003ctd\u003eFlat Top\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\u003eWhite\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCryo 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\u003eLow-Temp Storage\u003c\/td\u003e\n\u003ctd\u003e-80°C and -196°C compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutoclave Compatible\u003c\/td\u003e\n\u003ctd\u003eYes — 121°C \/ 15 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003e200\/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\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\u003eCryogenic vial capping for MST™ vials in LN₂ vapor-phase biobank archives at -196°C\u003c\/li\u003e\n\u003cli\u003eUltra-low temperature (-80°C) biorepository storage of biological specimens\u003c\/li\u003e\n\u003cli\u003eHigh-contrast barcode labeling workflows where flat-top label readability is the primary specimen routing method\u003c\/li\u003e\n\u003cli\u003eHigh-density cryo box stacking programs where a flat-top profile improves storage density compared to dome-top caps\u003c\/li\u003e\n\u003cli\u003eAutomated and robotic cryo vial handling systems requiring a consistent, flat cap engagement surface\u003c\/li\u003e\n\u003cli\u003eColor-coded multi-specimen cryo box organization across the 12-color MST™ cap range\u003c\/li\u003e\n\u003cli\u003eReplacement cap supply for existing MST™ cryogenic vial inventories\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThese MST™ flat-top caps are designed exclusively for MST™ cryogenic vials and use a thread and cap profile that is distinct from — and not interchangeable with — CryoSure® dome-top vials and caps. Always confirm you are matching MST™ caps to MST™ vials; the two series cannot be substituted for one another. If you are transitioning a biorepository program or replacing caps for an existing MST™ vial inventory, Caplugs® Evergreen offers all 12 MST™ colors in the same 200\/Bag format so color-coded routing schemes can be maintained without interruption. When adopting these caps for a new workflow, validate fit with a sample lot before committing to bulk purchase.\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\u003eLiquid nitrogen (-196°C), vapor phase and immersion\u003c\/td\u003e\n\u003ctd\u003eExcellent — engineered for LN₂ service\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e-80°C mechanical freezer storage\u003c\/td\u003e\n\u003ctd\u003eExcellent — HDPE cryo-toughened\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAqueous cryoprotectants (glycerol, sucrose solutions)\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDMSO at standard cryo concentrations (5–10%)\u003c\/td\u003e\n\u003ctd\u003eGood\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\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, these MST™ cryogenic vial caps are produced by Caplugs® Evergreen from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer stocking the full MST™ color range and shipping from USA inventory. Tiered pricing is available for high-volume biorepository programs, institutional procurement offices, and grant-funded research laboratories.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill these caps fit CryoSure® cryogenic vials?\u003c\/strong\u003e\u003cbr\u003eNo. MST™ flat-top caps use a thread and cap profile specific to MST™ vials and are not interchangeable with CryoSure® dome-top vials or caps. Always match the cap series to the vial series, and validate fit with a sample before bulk purchase if you are unsure which vial series your lab uses.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these caps rated for liquid nitrogen immersion, or vapor phase only?\u003c\/strong\u003e\u003cbr\u003eBoth. The HDPE used in MST™ caps is rated for LN₂ vapor phase storage at -196°C as well as full LN₂ immersion, in addition to -80°C mechanical freezer environments.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan these caps be autoclaved before use?\u003c\/strong\u003e\u003cbr\u003eYes — MST™ HDPE caps are autoclave-compatible at 121°C \/ 15 psi, supporting workflows that require sterile cap supply prior to specimen loading.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy choose white caps over other colors in the MST™ range?\u003c\/strong\u003e\u003cbr\u003eWhite offers the highest contrast surface in the 12-color MST™ range for both adhesive cryolabels and LIS-printed barcode labels, making it the preferred cap color in biorepository programs where flat-top label readability is the primary method of specimen identification and routing.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"MST™ Flat-Top Cryogenic Vial Caps, HDPE, White, 200\/Bag — Caplugs® Evergreen\",\"sku\":\"300-3910-FW20\",\"mpn\":\"300-3910-FW20\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"High-Density Polyethylene (HDPE)\",\"color\":\"White\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"19.78\",\"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 CryoSure® cryogenic vials?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No. MST™ flat-top caps use a thread and cap profile specific to MST™ vials and are not interchangeable with CryoSure® dome-top vials or caps. 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