{"product_id":"caplugs-300-3910-fb20-mst-flat-top-cryo-vial-caps-hdpe-blue","title":"Cryo Vial Caps, HDPE, Blue — 300-3910-FB20 | 200\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eFlat Top MST™ Cryogenic Vial Caps, HDPE, Blue — 300-3910-FB20 | 200\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 300-3910-FB20\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eSub-brand\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eMST™ (Caplugs® Evergreen)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eCap Profile\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eFlat Top — distinct from CryoSure® dome-top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eHigh-Density Polyethylene (HDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eBlue\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eCryo Rating\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e✓ LN₂ vapor phase (-196°C) and immersion\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eColor Use\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eBlue MST™ caps mirror the CLSI H3 blue-top sodium citrate co\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003evs CryoSure®\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eMST™ flat top for MST™ vials; CryoSure® dome top for CryoSure® vials\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePack Size\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e200\/Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e$19.78 \/ Bag ($0.0989 \/ cap)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eTechnical Narrative\u003c\/h2\u003e \u003cp\u003eThe Caplugs® Evergreen MST™ is a blue HDPE flat-top cryogenic vial cap for MST™ cryogenic vials, rated for LN₂ vapor phase (-196°C), LN₂ immersion, and -80°C mechanical freezer storage. Blue MST™ caps mirror the CLSI H3 blue-top sodium citrate convention — designating citrate-preserved cryogenic vial specimens in MST™ vial cryo box programs.\u003c\/p\u003e \u003cp\u003eThe flat-top profile distinguishes MST™ caps from CryoSure® dome-top caps — MST™ caps are not interchangeable with CryoSure® vials or other vial formats. All 12 MST™ colors are in 200\/Bag format at $19.78 ($0.0989\/cap). See the complete 12-color table above, including the MST™-exclusive Chocolate (FM20) and Amber (FN20).\u003c\/p\u003e \u003cp\u003eAt $19.78 per 200\/Bag — $0.0989 per cap.\u003c\/p\u003e \u003ch2\u003eTechnical Specifications — Caplugs® Evergreen \u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eSpecification\u003c\/th\u003e \u003cth\u003eValue\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003ePart Number\u003c\/td\u003e \u003ctd\u003e\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCaplugs Item #\u003c\/td\u003e \u003ctd\u003e3003910FB20E1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSub-brand\u003c\/td\u003e \u003ctd\u003eMST™ (Caplugs® Evergreen)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCap Profile\u003c\/td\u003e \u003ctd\u003eFlat Top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMaterial\u003c\/td\u003e \u003ctd\u003eHigh-Density Polyethylene (HDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor\u003c\/td\u003e \u003ctd\u003eBlue\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCryo Rating\u003c\/td\u003e \u003ctd\u003eLN₂ vapor phase and immersion (-196°C)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eStorage\u003c\/td\u003e \u003ctd\u003e✓ -80°C and -196°C compatible\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutoclave\u003c\/td\u003e \u003ctd\u003e✓ Compatible (121°C \/ 15 psi)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003evs CryoSure®\u003c\/td\u003e \u003ctd\u003eDifferent thread and cap profile — MST™ vials only\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePack Size\u003c\/td\u003e \u003ctd\u003e200\/Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eBPA\/Phthalate\u003c\/td\u003e \u003ctd\u003eBPA-free; no phthalate plasticizers\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCountry of Origin\u003c\/td\u003e \u003ctd\u003eMade in U.S.A. (California)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eMST™ Flat Top Cap Compatibility — Blue\u003c\/h2\u003e \u003cp\u003eThe MST™ flat-top cap fits MST™ cryogenic vials for:\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eApplication\u003c\/th\u003e \u003cth\u003eUse \/ Storage\u003c\/th\u003e \u003cth\u003eNotes\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003eCryo vial capping (flat top)\u003c\/td\u003e \u003ctd\u003eMST™ cryogenic vials (Caplugs® Evergreen)\u003c\/td\u003e \u003ctd\u003eFlat top — different profile from CryoSure® dome-top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eLN₂ vapor phase archive\u003c\/td\u003e \u003ctd\u003eBiobank LN₂ vapor phase at -196°C\u003c\/td\u003e \u003ctd\u003eHDPE engineered for LN₂ temperatures\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e-80°C mechanical freezer\u003c\/td\u003e \u003ctd\u003eUltra-low temp biorepository\u003c\/td\u003e \u003ctd\u003eHDPE cryo stability through freeze-thaw cycling\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eFlat-top cryo box stacking\u003c\/td\u003e \u003ctd\u003eHigh-density cryo box programs\u003c\/td\u003e \u003ctd\u003eFlat top improves stacking vs dome-top caps\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor-coded cryo routing\u003c\/td\u003e \u003ctd\u003eMulti-specimen cryo box organization\u003c\/td\u003e \u003ctd\u003e12 colors including Chocolate and Amber\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutomated cap handling\u003c\/td\u003e \u003ctd\u003eRobotic cryo vial cap-on\/cap-off systems\u003c\/td\u003e \u003ctd\u003eFlat profile enables consistent robotic engagement\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCell line cryopreservation\u003c\/td\u003e \u003ctd\u003eDMSO-cryoprotected cell line archives\u003c\/td\u003e \u003ctd\u003eHDPE DMSO compatible at standard cryo concentrations\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eReplacement cap supply\u003c\/td\u003e \u003ctd\u003eReplacing lost\/damaged MST™ vial caps\u003c\/td\u003e \u003ctd\u003eThread specific to MST™ vials — not interchangeable with CryoSure®\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eMST™ caps are for MST™ vials only. Validate fit with a sample before bulk purchase.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eChemical Resistance — HDPE MST™ Cryogenic Grade\u003c\/h2\u003e \u003cp\u003eMST™ HDPE maintains integrity from +121°C autoclave through -196°C LN₂.\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eReagent \/ Condition\u003c\/th\u003e \u003cth\u003eCompatibility\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003eLiquid nitrogen (-196°C)\u003c\/td\u003e \u003ctd\u003e✓ Engineered for LN₂ vapor + immersion\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eStorage at -80°C\u003c\/td\u003e \u003ctd\u003e✓ Excellent — HDPE cryo-toughened\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDMSO (cryoprotectant conc.)\u003c\/td\u003e \u003ctd\u003e✓ Good — 5–10% standard cryo media\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAqueous cryoprotectants\u003c\/td\u003e \u003ctd\u003e✓ Excellent (FBS, glycerol, Bambanker)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutoclave (121°C)\u003c\/td\u003e \u003ctd\u003e✓ Compatible\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eConcentrated organic solvents\u003c\/td\u003e \u003ctd\u003e✗ Not recommended\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eComplete MST™ Cap Range — 12 Colors\u003c\/h2\u003e \u003cp\u003eAll 12 colors in 200\/Bag at $19.78. Note Chocolate and Amber — exclusive to MST™:\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003ePart Number\u003c\/th\u003e \u003cth\u003eColor\u003c\/th\u003e \u003cth\u003ePrimary Use\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e300-3910-F020\u003c\/td\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003ctd\u003eUniversal \/ label-based ID\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eBlue\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eCitrate \/ CLSI blue-top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FE20\u003c\/td\u003e \u003ctd\u003eOrange\u003c\/td\u003e \u003ctd\u003eSTAT \/ priority cryo batch\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FG20\u003c\/td\u003e \u003ctd\u003eGreen\u003c\/td\u003e \u003ctd\u003eSpecimen-type or batch designation\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FL20\u003c\/td\u003e \u003ctd\u003eLavender\u003c\/td\u003e \u003ctd\u003eEDTA anticoagulant \/ lavender-top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FM20\u003c\/td\u003e \u003ctd\u003eChocolate\u003c\/td\u003e \u003ctd\u003eSpecialized batch — unique to MST™\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FN20\u003c\/td\u003e \u003ctd\u003eAmber\u003c\/td\u003e \u003ctd\u003eLight attenuation — unique to MST™\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FP20\u003c\/td\u003e \u003ctd\u003eFuchsia\u003c\/td\u003e \u003ctd\u003eGYN \/ anatomic pathology batches\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FR20\u003c\/td\u003e \u003ctd\u003eRed\u003c\/td\u003e \u003ctd\u003eSerum \/ CLSI red-top convention\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FW20\u003c\/td\u003e \u003ctd\u003eWhite\u003c\/td\u003e \u003ctd\u003eHigh-contrast label surface\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FY20\u003c\/td\u003e \u003ctd\u003eYellow\u003c\/td\u003e \u003ctd\u003eSPS\/ACD \/ CLSI yellow-top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FZ20\u003c\/td\u003e \u003ctd\u003eBlack\u003c\/td\u003e \u003ctd\u003eLight-sensitive specimen protection\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eLaboratory Applications\u003c\/h2\u003e \u003cp\u003eMST™ serves biobank programs using MST™ vials with blue color-coded routing; automated cryo vial handling systems requiring flat-top cap geometry; and any MST™ vial program requiring cryo-rated HDPE closure at -196°C LN₂.\u003c\/p\u003e \u003ch2\u003eU.S. Manufacturing, Quality \u0026amp; Institutional Procurement\u003c\/h2\u003e \u003cp\u003eEvery Caplugs® Evergreen lot is precision-molded at our California manufacturing facility. We supply reference laboratories, hospital systems, and federal procurement offices under institutional pricing programs. \u003ca href=\"#request-sample\"\u003eRequest a free sample below\u003c\/a\u003e to validate fit before committing to volume.\u003c\/p\u003e \u003ch2\u003eFrequently Asked Questions — Caplugs® Evergreen \u003c\/h2\u003e \u003ch3\u003eWhat is the color routing convention for blue MST™ flat-top caps?\u003c\/h3\u003e \u003cp\u003eBlue MST™ caps mirror the CLSI H3 blue-top sodium citrate convention — designating citrate-preserved cryogenic vial specimens in MST™ vial cryo box programs. All 12 MST™ colors share identical HDPE cryo specification at $19.78\/200-bag.\u003c\/p\u003e \u003ch3\u003eWhat is the difference between MST™ caps and CryoSure® caps?\u003c\/h3\u003e \u003cp\u003eMST™ caps (300-3910 series) have a flat-top profile and fit MST™ cryogenic vials. CryoSure® caps (300-3900 series) have a dome-top profile and fit CryoSure® vials. Both are HDPE-engineered for -196°C LN₂. They are not interchangeable — match cap series to vial series. MST™ also offers 12 colors including Chocolate and Amber not available in CryoSure®.\u003c\/p\u003e \u003ch3\u003eAre MST™ flat-top caps compatible with LN₂ immersion storage?\u003c\/h3\u003e \u003cp\u003eYes. MST™ HDPE caps are engineered for LN₂ vapor phase (-196°C) and direct LN₂ immersion. Do not substitute standard HDPE tube caps from the 300-3010\/300-3532\/300-3541 families — those are not rated for LN₂ temperatures. Use only MST™ caps on MST™ vials.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Flat Top MST\\u2122 Cryogenic Vial Caps, Non-Sterile, High-Density Polyethylene (HDPE), Blue \\u2014 300-3910-FB20 | 200\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 300-3910-FB20. MST\\u2122 flat top HDPE cryo vial caps, blue, 200\/Bag. LN\\u2082 vapor + -80\\u00b0C. BPA-free. USA.\",\n  \"sku\": \"3003910FB20E1\",\n  \"mpn\": \"300-3910-FB20\",\n  \"material\": \"High-Density Polyethylene (HDPE)\",\n  \"color\": \"Blue\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Caplugs\\u00ae Evergreen\"\n  },\n  \"manufacturer\": {\n    \"@type\": \"Organization\",\n    \"name\": \"Caplugs\\u00ae Evergreen\",\n    \"address\": {\n      \"@type\": \"PostalAddress\",\n      \"addressCountry\": \"US\",\n      \"addressRegion\": \"CA\"\n    }\n  },\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"price\": \"19.78\",\n    \"priceCurrency\": \"USD\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"itemCondition\": \"https:\/\/schema.org\/NewCondition\",\n    \"seller\": {\n      \"@type\": \"Organization\",\n      \"name\": \"LabSupplies\"\n    }\n  },\n  \"additionalProperty\": [\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Sub-brand\",\n      \"value\": \"MST\\u2122\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Cap Profile\",\n      \"value\": \"Flat Top\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Cryo Rating\",\n      \"value\": \"LN\\u2082 vapor + immersion (-196\\u00b0C)\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Pack Size\",\n      \"value\": \"200 \/ Bag\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Sterility\",\n      \"value\": \"Non-Sterile\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Country of Origin\",\n      \"value\": \"United States\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"BPA Free\",\n      \"value\": \"Yes\"\n    }\n  ]\n}\n\u003c\/script\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the color routing convention for blue MST\\u2122 flat-top caps?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Blue MST\\u2122 caps mirror the CLSI H3 blue-top sodium citrate convention \\u2014 designating citrate-preserved cryogenic vial specimens in MST\\u2122 vial cryo box programs. All 12 MST\\u2122 colors share identical HDPE cryo specification at $19.78\/200-bag.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between MST\\u2122 caps and CryoSure\\u00ae caps?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"MST\\u2122 caps (300-3910 series) have a flat-top profile and fit MST\\u2122 cryogenic vials. CryoSure\\u00ae caps (300-3900 series) have a dome-top profile and fit CryoSure\\u00ae vials. Both are HDPE-engineered for -196\\u00b0C LN\\u2082. They are not interchangeable \\u2014 match cap series to vial series. MST\\u2122 also offers 12 colors including Chocolate and Amber not available in CryoSure\\u00ae.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are MST\\u2122 flat-top caps compatible with LN\\u2082 immersion storage?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. MST\\u2122 HDPE caps are engineered for LN\\u2082 vapor phase (-196\\u00b0C) and direct LN\\u2082 immersion. Do not substitute standard HDPE tube caps from the 300-3010\/300-3532\/300-3541 families \\u2014 those are not rated for LN\\u2082 temperatures. Use only MST\\u2122 caps on MST\\u2122 vials.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48568505630952,"sku":"300-3910-FB20","price":19.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-3910-FB20_01.jpg?v=1779115174","url":"https:\/\/labsupplies.com\/products\/caplugs-300-3910-fb20-mst-flat-top-cryo-vial-caps-hdpe-blue","provider":"LabSupplies.com","version":"1.0","type":"link"}