{"product_id":"caplugs-300-3910-fz20-mst-flat-top-cryo-vial-caps-hdpe-black","title":"Vial Caps, HDPE, Black — 300-3910-FZ20 | 200\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eFlat Top MST™ Cryogenic Vial Caps, HDPE, Black — 300-3910-FZ20 | 200\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 300-3910-FZ20\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\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\u003eBlack\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\u003eLight Block\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eComplete light blockage — opaque black HDPE\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003evs Amber (FN20)\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eAmber: partial attenuation; Black: complete blockage\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMST™ complete\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e12th and final color — flat top family complete\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 the Black HDPE flat-top cryogenic vial cap — the 12th and final color completing the MST™ flat-top (300-3910) range. Black HDPE provides complete light blockage for photosensitive cryogenic specimens, blocking all visible and UV light transmission to the vial contents. This is distinct from Amber (300-3910-FN20), which provides partial attenuation while remaining translucent — use Amber when some visual inspection of vial contents is still required; use Black when maximum light exclusion is the priority.\u003c\/p\u003e \u003cp\u003eWith this listing, the MST™ flat-top cap range is complete at 12 colors. The MST™ sub-brand also includes two additional cap profiles: Recessed Top (300-3914 series, 3 colors) and Tethered Recessed (300-3918 series, 5 colors) — each with a distinct cap geometry for specific workflow applications. All MST™ caps are for MST™ vials only and not interchangeable with CryoSure® vials.\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\u003e3003910FZ20E1\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\u003eBlack\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\u003eLight Block\u003c\/td\u003e \u003ctd\u003eComplete — opaque black HDPE absorbs all visible light\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\u003eMST™ Profile Range\u003c\/td\u003e \u003ctd\u003eFlat Top (300-3910); Recessed (300-3914); Tethered (300-3918)\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™ Black Flat Top — Light-Protected Cryo Vial Applications\u003c\/h2\u003e \u003cp\u003eBlack MST™ caps serve all standard cryo vial applications plus light-sensitive specimen protection:\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™ cryo vials\u003c\/td\u003e \u003ctd\u003eComplete light blockage for photosensitive specimens\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eLN₂ vapor phase archive\u003c\/td\u003e \u003ctd\u003e-196°C biobank\u003c\/td\u003e \u003ctd\u003eHDPE LN₂-engineered\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e-80°C archive\u003c\/td\u003e \u003ctd\u003eULT biorepository\u003c\/td\u003e \u003ctd\u003eHDPE cryo stability\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eLight-sensitive specimens\u003c\/td\u003e \u003ctd\u003eBilirubin, porphyrins, TDM analytes\u003c\/td\u003e \u003ctd\u003eBlack: complete blockage vs Amber: partial\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCell line cryopreservation\u003c\/td\u003e \u003ctd\u003eDMSO-protected cell lines\u003c\/td\u003e \u003ctd\u003eHDPE DMSO compatible\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eMST™ caps for MST™ vials only. Not interchangeable with CryoSure® vials.\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\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™ Flat Top Range — 12 Colors\u003c\/h2\u003e \u003cp\u003eAll 12 at $19.78\/200-bag. Black is the final color — MST™ flat top family now complete:\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003ePart Number\u003c\/th\u003e \u003cth\u003eColor\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 \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FB20\u003c\/td\u003e \u003ctd\u003eBlue\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FE20\u003c\/td\u003e \u003ctd\u003eOrange\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FG20\u003c\/td\u003e \u003ctd\u003eGreen\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FL20\u003c\/td\u003e \u003ctd\u003eLavender\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FM20\u003c\/td\u003e \u003ctd\u003eChocolate\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FN20\u003c\/td\u003e \u003ctd\u003eAmber\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FP20\u003c\/td\u003e \u003ctd\u003eFuchsia\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FR20\u003c\/td\u003e \u003ctd\u003eRed\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FW20\u003c\/td\u003e \u003ctd\u003eWhite\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3910-FY20\u003c\/td\u003e \u003ctd\u003eYellow\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eBlack\u003c\/strong\u003e\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eAlso available: MST™ Recessed Top (300-3914, 3 colors) and MST™ Tethered Recessed (300-3918, 5 colors) — see those listings for the other MST™ cap profiles.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eLaboratory Applications\u003c\/h2\u003e \u003cp\u003eMST™ serves biobank programs archiving photosensitive specimens in MST™ vials at LN₂ or -80°C; clinical biorepository programs protecting bilirubin, porphyrin, or TDM analytes in cryogenic vial format.\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\u003eDoes this listing complete the MST™ flat-top cap color range?\u003c\/h3\u003e \u003cp\u003eYes. Black is the 12th and final color in the MST™ flat-top (300-3910) range, completing all colors: Natural, Blue, Orange, Green, Lavender, Chocolate, Amber, Fuchsia, Red, White, Yellow, and Black. All 12 are in 200\/Bag format at $19.78.\u003c\/p\u003e \u003ch3\u003eWhat is the difference between Black (FZ20) and Amber (FN20) MST™ caps?\u003c\/h3\u003e \u003cp\u003eBlack : opaque HDPE, complete light blockage — for specimens requiring maximum protection from visible and UV light (bilirubin, porphyrins, some TDM analytes). Amber (300-3910-FN20): semi-translucent HDPE, partial UV\/visible attenuation — for specimens needing some protection while still allowing visual inspection of vial contents. Both are exclusive to MST™ and not available in CryoSure®.\u003c\/p\u003e \u003ch3\u003eWhat other MST™ cap profiles are available beyond flat-top?\u003c\/h3\u003e \u003cp\u003eThree MST™ cap profiles exist: Flat Top (300-3910, 12 colors, $19.78\/200-bag) — this series; Recessed Top (300-3914, 3 colors — Natural\/Blue\/Yellow, $17.77\/200-bag); Tethered Recessed (300-3918, 5 colors — Orange\/Green\/Lavender\/White\/Yellow, $18.73\/200-bag). All three fit MST™ vials and are not interchangeable with CryoSure® vials. Choose profile based on your cap-handling workflow requirements.\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), Black \\u2014 300-3910-FZ20 | 200\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 300-3910-FZ20. MST\\u2122 flat top HDPE cryo vial caps, black, 200\/Bag. Complete light blockage. LN\\u2082 + -80\\u00b0C. BPA-free. USA.\",\n  \"sku\": \"3003910FZ20E1\",\n  \"mpn\": \"300-3910-FZ20\",\n  \"material\": \"High-Density Polyethylene (HDPE)\",\n  \"color\": \"Black\",\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\": \"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\": \"Does this listing complete the MST\\u2122 flat-top cap color range?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. 300-3910-FZ20 Black is the 12th and final color in the MST\\u2122 flat-top (300-3910) range, completing all colors: Natural, Blue, Orange, Green, Lavender, Chocolate, Amber, Fuchsia, Red, White, Yellow, and Black. All 12 are in 200\/Bag format at $19.78.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between Black (FZ20) and Amber (FN20) MST\\u2122 caps?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Black (300-3910-FZ20): opaque HDPE, complete light blockage \\u2014 for specimens requiring maximum protection from visible and UV light (bilirubin, porphyrins, some TDM analytes). Amber (300-3910-FN20): semi-translucent HDPE, partial UV\/visible attenuation \\u2014 for specimens needing some protection while still allowing visual inspection of vial contents. Both are exclusive to MST\\u2122 and not available in CryoSure\\u00ae.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What other MST\\u2122 cap profiles are available beyond flat-top?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Three MST\\u2122 cap profiles exist: Flat Top (300-3910, 12 colors, $19.78\/200-bag) \\u2014 this series; Recessed Top (300-3914, 3 colors \\u2014 Natural\/Blue\/Yellow, $17.77\/200-bag); Tethered Recessed (300-3918, 5 colors \\u2014 Orange\/Green\/Lavender\/White\/Yellow, $18.73\/200-bag). All three fit MST\\u2122 vials and are not interchangeable with CryoSure\\u00ae vials. Choose profile based on your cap-handling workflow requirements.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48568507629800,"sku":"300-3910-FZ20","price":19.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-3910-FZ20_01.jpg?v=1779115585","url":"https:\/\/labsupplies.com\/products\/caplugs-300-3910-fz20-mst-flat-top-cryo-vial-caps-hdpe-black","provider":"LabSupplies.com","version":"1.0","type":"link"}