{"product_id":"caplugs-300-3914-hb20-mst-recessed-top-cryo-vial-caps-hdpe-blue","title":"Vial Caps, HDPE, Blue — 300-3914-HB20 | 200\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eRecessed Top MST™ Cryogenic Vial Caps, HDPE, Blue — 300-3914-HB20 | 200\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 300-3914-HB20\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\u003eRecessed Top — top surface recessed below cap rim\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 recessed-top caps mirror the CLSI H3 blue-top citrate c\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003evs Flat Top\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eRecessed: $17.77; Flat Top: $19.78 — $2.01 lower per bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003evs Tethered\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eRecessed: cap separate; Tethered: cap stays on vial\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$17.77 \/ Bag ($0.0889 \/ 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 recessed-top cryogenic vial cap for MST™ cryogenic vials. The recessed-top profile means the cap's top surface sits below the outer rim of the cap body — protecting the top surface from contact damage in cryo boxes and during vial handling. Blue recessed-top caps mirror the CLSI H3 blue-top citrate convention for recessed-top MST™ vial cryo archives. The recessed top is the most economical MST™ cap profile at $17.77\/200-bag — $2.01\/bag less than flat-top (300-3910, $19.78) and $0.96\/bag less than tethered recessed (300-3918, $18.73).\u003c\/p\u003e \u003cp\u003eLike all MST™ caps, the recessed-top profile is engineered for LN₂ vapor phase (-196°C) and immersion storage, and is not interchangeable with CryoSure® vials. The recessed-top cap removes completely from the vial — unlike the Tethered Recessed (300-3918) where the cap stays attached to the vial after opening via a flexible tether. Only 3 colors are available in the recessed-top format: Natural, Blue, and Yellow.\u003c\/p\u003e \u003cp\u003eAt $17.77 per 200\/Bag — $0.0889 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\u003e3003914HB20E1\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\u003eRecessed Top — top surface set below outer rim\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 Flat Top (300-3910)\u003c\/td\u003e \u003ctd\u003eDifferent top profile; same MST™ vial thread\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003evs Tethered (300-3918)\u003c\/td\u003e \u003ctd\u003eRecessed cap removes completely; tethered stays attached\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™ Recessed Top Cap Compatibility — Blue\u003c\/h2\u003e \u003cp\u003eThe MST™ recessed-top cap fits MST™ recessed-top cryo 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 (recessed)\u003c\/td\u003e \u003ctd\u003eMST™ recessed-top cryo vials\u003c\/td\u003e \u003ctd\u003eRecessed profile protects top from contact damage\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eLN₂ vapor phase\u003c\/td\u003e \u003ctd\u003e-196°C biobank archive\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\u003eColor-coded routing\u003c\/td\u003e \u003ctd\u003e3-color routing scheme\u003c\/td\u003e \u003ctd\u003eNatural\/Blue\/Yellow cover primary CLSI conventions\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCost-optimized program\u003c\/td\u003e \u003ctd\u003eBudget-conscious cryo cap selection\u003c\/td\u003e \u003ctd\u003eLowest-price MST™ profile at $17.77\/bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCell line cryo\u003c\/td\u003e \u003ctd\u003eDMSO-protected vials\u003c\/td\u003e \u003ctd\u003eHDPE DMSO compatible\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eMST™ recessed-top caps for MST™ vials only. Not interchangeable with CryoSure® or flat-top MST™ 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\u003eMST™ Recessed Top Cap Range — 3 Colors\u003c\/h2\u003e \u003cp\u003eAll 3 in 200\/Bag at $17.77. Recessed top profile:\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003ePart Number\u003c\/th\u003e \u003cth\u003eColor\u003c\/th\u003e \u003cth\u003ePrice\u003c\/th\u003e \u003cth\u003eConvention\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e300-3914-H020\u003c\/td\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003ctd\u003e$17.77\u003c\/td\u003e \u003ctd\u003eGeneral \/ 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\u003e$17.77\u003c\/td\u003e \u003ctd\u003eCitrate \/ CLSI blue-top convention\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3914-HY20\u003c\/td\u003e \u003ctd\u003eYellow\u003c\/td\u003e \u003ctd\u003e$17.77\u003c\/td\u003e \u003ctd\u003eSPS\/ACD \/ CLSI yellow-top convention\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eAlso available: MST™ Flat Top (300-3910, 12 colors, $19.78) and MST™ Tethered Recessed (300-3918, 5 colors, $18.73).\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eLaboratory Applications\u003c\/h2\u003e \u003cp\u003eMST™ serves biobank programs using MST™ recessed-top vials requiring blue color-coded routing; programs selecting the most economical MST™ cap profile; and any MST™ recessed-top vial workflow at -196°C LN₂ or -80°C.\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 recessed-top cap profile and how does it differ from flat-top?\u003c\/h3\u003e \u003cp\u003eOn a recessed-top cap, the top surface sits below the outer rim of the cap body — the rim forms a protective ring around the top. On a flat-top cap (300-3910), the top surface is flush with the rim. The recessed profile protects the cap top from contact damage during vial stacking and handling in cryo boxes. The recessed-top is also the lowest-priced MST™ profile ($17.77\/200-bag vs $19.78 for flat-top).\u003c\/p\u003e \u003ch3\u003eWhy are only 3 colors available in the recessed-top format?\u003c\/h3\u003e \u003cp\u003eThe MST™ recessed-top range (300-3914) is available in Natural, Blue, and Yellow — covering the three most common CLSI color conventions: general purpose (Natural), citrate\/coagulation (Blue), and SPS\/ACD (Yellow). For the full 12-color range, use the MST™ flat-top series (300-3910). For a tethered recessed cap in more colors, see the 300-3918 series (Orange, Green, Lavender, White, Yellow — 5 colors).\u003c\/p\u003e \u003ch3\u003eIs the recessed-top cap compatible with LN₂ immersion?\u003c\/h3\u003e \u003cp\u003eYes. MST™ recessed-top HDPE caps are engineered for LN₂ vapor phase (-196°C) and direct LN₂ immersion. Do not use standard HDPE tube caps at LN₂ temperatures — use only MST™ or CryoSure® caps specifically engineered for cryogenic service. MST™ caps are for MST™ vials only.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Recessed Top MST\\u2122 Cryogenic Vial Caps, Non-Sterile, High-Density Polyethylene (HDPE), Blue \\u2014 300-3914-HB20 | 200\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 300-3914-HB20. MST\\u2122 recessed top HDPE cryo vial caps, blue, 200\/Bag. LN\\u2082 vapor + -80\\u00b0C. BPA-free. 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