{"product_id":"caplugs-300-3918-tw20-mst-tethered-recessed-cryo-vial-hdpe-white","title":"Vial Caps, Tethered Caps, HDPE, White — 300-3918-TW20 | 200\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eTethered Recessed MST™ Cryogenic Vial Caps, HDPE, White — 300-3918-TW20 | 200\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 300-3918-TW20\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\u003eTethered Recessed — cap stays on vial via flexible HDPE tether\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eKey Feature\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eCap-loss prevention: tether prevents cap from leaving vial\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\u003eWhite\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\u003eWhite tethered caps provide the highest-contrast surface for\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$18.73 \/ Bag ($0.0937 \/ 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 white HDPE tethered recessed cryogenic vial cap for MST™ cryogenic vials — rated for LN₂ vapor phase (-196°C), LN₂ immersion, and -80°C storage. White tethered caps provide the highest-contrast surface for adhesive and LIS-printed barcode labels — the preferred choice for biorepository programs using label-based routing on tethered MST™ cryo vials. The flat label surface on the recessed top maximizes label adhesion area.\u003c\/p\u003e \u003cp\u003eThe tether eliminates cap loss during cryo vial retrieval — a meaningful advantage in high-density cryo box programs where loose caps create contamination and identification risks. All 5 tethered recessed colors are at $18.73\/200-bag — $0.96\/bag more than the non-tethered recessed format (300-3914, $17.77) for the cap-retention benefit.\u003c\/p\u003e \u003cp\u003eAt $18.73 per 200\/Bag — $0.0937 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\u003e3003918TW20E1\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\u003eTethered Recessed\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eTether\u003c\/td\u003e \u003ctd\u003eFlexible HDPE tether — cap attached to vial after opening\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\u003eWhite\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✓ 121°C \/ 15 psi\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™ Tethered Recessed Cap Compatibility — White\u003c\/h2\u003e \u003cp\u003eFits MST™ tethered 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\u003eCap-loss prevention\u003c\/td\u003e \u003ctd\u003eHigh-density cryo box retrieval\u003c\/td\u003e \u003ctd\u003eTether keeps cap on vial — no loose caps\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eLN₂ vapor phase archive\u003c\/td\u003e \u003ctd\u003e-196°C biobank programs\u003c\/td\u003e \u003ctd\u003eHDPE tether and cap LN₂-rated\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\u003eSTAT specimen retrieval\u003c\/td\u003e \u003ctd\u003eUrgent access from cryo archive\u003c\/td\u003e \u003ctd\u003eTethered cap: open quickly, no cap tracking\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor-coded cryo routing\u003c\/td\u003e \u003ctd\u003eMulti-specimen cryo box programs\u003c\/td\u003e \u003ctd\u003e5 tethered colors: Orange\/Green\/Lavender\/White\/Yellow\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutomated cryo handling\u003c\/td\u003e \u003ctd\u003eRobotic cap-on\/cap-off systems\u003c\/td\u003e \u003ctd\u003eRecessed profile for consistent robotic engagement\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCell line cryopreservation\u003c\/td\u003e \u003ctd\u003eDMSO-protected cell line archives\u003c\/td\u003e \u003ctd\u003eHDPE DMSO compatible\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eMST™ tethered caps for MST™ tethered vials only.\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\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDMSO (cryo conc.)\u003c\/td\u003e \u003ctd\u003e✓ Good — 5–10%\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 organics\u003c\/td\u003e \u003ctd\u003e✗ Not recommended\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eComplete MST™ Tethered Recessed Range — 5 Colors\u003c\/h2\u003e \u003cp\u003eAll 5 at $18.73\/200-bag — tether keeps cap on vial after opening:\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003ePart Number\u003c\/th\u003e \u003cth\u003eColor\u003c\/th\u003e \u003cth\u003eConvention\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e300-3918-TE20\u003c\/td\u003e \u003ctd\u003eOrange\u003c\/td\u003e \u003ctd\u003eSTAT \/ priority cryo batch\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3918-TG20\u003c\/td\u003e \u003ctd\u003eGreen\u003c\/td\u003e \u003ctd\u003eSpecimen-type or batch designation\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3918-TL20\u003c\/td\u003e \u003ctd\u003eLavender\u003c\/td\u003e \u003ctd\u003eEDTA anticoagulant \/ lavender-top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e\u003cstrong\u003eWhite\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eHigh-contrast label surface\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e300-3918-TY20\u003c\/td\u003e \u003ctd\u003eYellow\u003c\/td\u003e \u003ctd\u003eSPS\/ACD \/ CLSI yellow-top\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eMST™ three-profile summary: Flat Top (300-3910, 12 colors, $19.78) · Recessed (300-3914, 3 colors, $17.77) · 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™ tethered vials with white color-coded routing; high-density cryo box programs where cap-loss prevention is a workflow priority; and any MST™ tethered vial program 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 color convention for white MST™ tethered recessed caps?\u003c\/h3\u003e \u003cp\u003eWhite tethered caps provide the highest-contrast surface for adhesive and LIS-printed barcode labels — the preferred choice for biorepository programs using label-based routing on tethered MST™ cryo vials. The flat label surface on the recessed top maximizes label adhesion area. All 5 tethered recessed colors share identical HDPE cryo specification at $18.73\/200-bag.\u003c\/p\u003e \u003ch3\u003eHow does the tethered recessed cap prevent cap loss in cryo archives?\u003c\/h3\u003e \u003cp\u003eA flexible HDPE tether connects the cap to the vial neck. When you unscrew the cap, it remains physically attached to the vial rather than becoming a loose piece. In high-density LN₂ cryo boxes, a dropped cap can sink between vials, contaminate adjacent specimens, or become lost — the tether eliminates all three failure modes. The tether also speeds up urgent specimen retrieval: no need to track a loose cap while handling the vial.\u003c\/p\u003e \u003ch3\u003eIs the tethered recessed cap compatible with LN₂ immersion?\u003c\/h3\u003e \u003cp\u003eYes. Both the cap and the HDPE tether are engineered for LN₂ vapor phase (-196°C) and direct LN₂ immersion. The tether maintains flexibility and structural integrity at cryogenic temperatures. MST™ tethered caps are for MST™ tethered vials only — not interchangeable with CryoSure® vials or non-tethered MST™ vial formats.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Tethered Recessed MST\\u2122 Cryogenic Vial Caps, Non-Sterile, High-Density Polyethylene (HDPE), White \\u2014 300-3918-TW20 | 200\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 300-3918-TW20. MST\\u2122 tethered recessed HDPE cryo vial caps, white, 200\/Bag. Cap stays on vial. LN\\u2082 + -80\\u00b0C. 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The flat label surface on the recessed top maximizes label adhesion area. All 5 tethered recessed colors share identical HDPE cryo specification at $18.73\/200-bag.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the tethered recessed cap prevent cap loss in cryo archives?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A flexible HDPE tether connects the cap to the vial neck. When you unscrew the cap, it remains physically attached to the vial rather than becoming a loose piece. In high-density LN\\u2082 cryo boxes, a dropped cap can sink between vials, contaminate adjacent specimens, or become lost \\u2014 the tether eliminates all three failure modes. The tether also speeds up urgent specimen retrieval: no need to track a loose cap while handling the vial.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the tethered recessed cap compatible with LN\\u2082 immersion?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Both the cap and the HDPE tether are engineered for LN\\u2082 vapor phase (-196\\u00b0C) and direct LN\\u2082 immersion. The tether maintains flexibility and structural integrity at cryogenic temperatures. MST\\u2122 tethered caps are for MST\\u2122 tethered vials only \\u2014 not interchangeable with CryoSure\\u00ae vials or non-tethered MST\\u2122 vial formats.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48568516903144,"sku":"300-3918-TW20","price":18.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-3918-TW20_02.jpg?v=1779115829","url":"https:\/\/labsupplies.com\/products\/caplugs-300-3918-tw20-mst-tethered-recessed-cryo-vial-hdpe-white","provider":"LabSupplies.com","version":"1.0","type":"link"}