{"product_id":"mst-cryogenic-freestanding-tubes-1-5ml-amber-ppc-2203949n80e1","title":"1.5 mL Racks, Freestanding, PPC, Amber — 220-3949-N80 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e1.5 mL Freestanding Cryogenic Tubes, Amber PPC, Non-Sterile — MST™ Snap-Cap, 1000\/Bag\u003c\/h2\u003e\n\u003cp\u003eThese MST™ 1.5 mL freestanding flat-bottom cryogenic tubes are molded from amber polypropylene copolymer (PPC) and rated for the full cryogenic range — from −80 °C ultra-low temperature (ULT) freezers through liquid nitrogen (LN2) storage at −196 °C and vapor-phase nitrogen. Supplied non-sterile in sealed 1000\/Bag packaging under part number 220-3949-N80, they combine crack-resistant cryogenic performance with light-blocking amber pigmentation to protect photosensitive specimens during long-term storage and retrieval.\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\u003e220-3949-N80\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\u003c\/td\u003e\n\u003ctd\u003e1.5 mL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Type\u003c\/td\u003e\n\u003ctd\u003eMST™ Cryogenic Freestanding Tube\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBottom Style\u003c\/td\u003e\n\u003ctd\u003eFlat Bottom (Freestanding)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCap Style\u003c\/td\u003e\n\u003ctd\u003eSnap Cap\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCryogenic Rating\u003c\/td\u003e\n\u003ctd\u003eLN2 (−196 °C) \/ Vapor-Phase N₂ \/ −80 °C ULT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePolypropylene Copolymer (PPC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eAmber\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGraduations\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSterility\u003c\/td\u003e\n\u003ctd\u003eNon-Sterile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBPA \/ Phthalate Free\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack Size\u003c\/td\u003e\n\u003ctd\u003e1000\/Bag\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\u003eBiobanking and long-term cell line storage in LN2 or vapor-phase nitrogen dewars\u003c\/li\u003e\n\u003cli\u003eDNA and RNA cryopreservation in −80 °C ULT freezers\u003c\/li\u003e\n\u003cli\u003eSerum and plasma aliquot archiving for clinical biospecimen repositories\u003c\/li\u003e\n\u003cli\u003eTissue sample and biopsy archiving at cryogenic temperatures\u003c\/li\u003e\n\u003cli\u003eStorage of fluorescent-labeled cells, bioluminescent samples, and photodegradable reagents requiring light protection\u003c\/li\u003e\n\u003cli\u003eDry ice shipment of cryogenic samples between facilities\u003c\/li\u003e\n\u003cli\u003eHigh-throughput biobank sample retrieval workflows where amber color provides rapid visual differentiation from clear tubes\u003c\/li\u003e\n\u003c\/ul\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\u003eAqueous buffers \/ saline\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute acids\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDilute bases\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMethanol\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIsopropanol\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAcetonitrile\u003c\/td\u003e\n\u003ctd\u003eGood\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAromatic \/ chlorinated solvents\u003c\/td\u003e\n\u003ctd\u003eLimited — not recommended for prolonged contact\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 at Caplugs® Evergreen ISO-certified manufacturing facilities, these MST™ cryogenic tubes are molded from virgin-grade, FDA-registered PPC resin and are free of BPA, phthalates, and latex. PPC copolymer retains flexibility and crack resistance at cryogenic temperatures where standard polypropylene homopolymer becomes brittle below −40 °C — a critical material advantage for LN2 and ULT applications. Sealed 1000\/Bag packaging maintains product integrity from warehouse receipt through point-of-use, with lot-level traceability to support CAP, CLIA, and ISO 15189 quality requirements. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with volume pricing available for biobanks, hospital systems, and grant-funded research institutions.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eAre these tubes rated for direct liquid nitrogen immersion?\u003c\/strong\u003e\u003cbr\u003eYes — the PPC copolymer construction maintains structural integrity at −196 °C, making these tubes suitable for both liquid-phase LN2 immersion and vapor-phase nitrogen storage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy choose amber tubes over standard clear cryogenic tubes?\u003c\/strong\u003e\u003cbr\u003eThe amber PPC pigmentation blocks visible and UV light, protecting photosensitive contents such as fluorescent-labeled cells, bioluminescent samples, and photodegradable reagents from light-induced degradation during storage and bench-top handling. The distinct amber color also speeds visual identification during high-throughput biobank retrieval workflows.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo these tubes include a rack, or are they truly freestanding on the bench?\u003c\/strong\u003e\u003cbr\u003eThe flat-bottom design allows the tubes to stand upright on any flat surface without a rack, which is convenient for aliquoting and sample retrieval during cryogenic workflows. No separate rack is required, though standard 1.5 mL tube racks are fully compatible.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eAre these tubes sterile, and can they be autoclaved?\u003c\/strong\u003e\u003cbr\u003eThese tubes are supplied non-sterile. PPC, like standard polypropylene, is generally autoclavable; however, Caplugs® Evergreen does not certify a sterility claim for this product as supplied, so laboratories requiring sterile cryogenic storage should consult their sterility validation protocols or seek a sterile-grade offering.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\/\",\"@type\":\"Product\",\"name\":\"1.5 mL Freestanding Cryogenic Tubes, Amber PPC, Snap Cap, Non-Sterile — MST™, 1000\/Bag\",\"sku\":\"2203949N80E1\",\"mpn\":\"220-3949-N80\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Caplugs® Evergreen\"},\"material\":\"Polypropylene Copolymer (PPC)\",\"color\":\"Amber\",\"offers\":{\"@type\":\"Offer\",\"priceCurrency\":\"USD\",\"price\":\"79.32\",\"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\":\"Are these tubes rated for direct liquid nitrogen immersion?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes — the PPC copolymer construction maintains structural integrity at −196 °C, making these tubes suitable for both liquid-phase LN2 immersion and vapor-phase nitrogen storage.\"}},{\"@type\":\"Question\",\"name\":\"Why choose amber tubes over standard clear cryogenic tubes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The amber PPC pigmentation blocks visible and UV light, protecting photosensitive contents such as fluorescent-labeled cells, bioluminescent samples, and photodegradable reagents from light-induced degradation during storage and bench-top handling. 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