{"product_id":"214-3712-02s-conical-microcentrifuge","title":"0.25 mL Microcentrifuge Tubes, Conical Bottom, HDPE, Natural — 214-3712-02S | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eQuick Reference\u003c\/h2\u003e \u003ctable\u003e \u003ctbody\u003e \u003ctr\u003e \u003cth\u003ePart Number\u003c\/th\u003e \u003ctd\u003e214-3712-02S\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eCapacity\u003c\/th\u003e \u003ctd\u003e0.25 mL\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eMaterial\u003c\/th\u003e \u003ctd\u003eLow-Density Polyethylene (LDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eKey Benefit\u003c\/th\u003e \u003ctd\u003eExceptional flexibility and softness — LDPE walls flex under finger pressure, allowing tube contents to be expressed by squeezing, and the soft body reduces brittle-fracture risk at cryogenic temperatures\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eColor\u003c\/th\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eGeometry\u003c\/th\u003e \u003ctd\u003eConical bottom\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eCap\u003c\/th\u003e \u003ctd\u003eSeparate snap cap (not tethered)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003ePack Size\u003c\/th\u003e \u003ctd\u003e1000\/Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eSterility\u003c\/th\u003e \u003ctd\u003eNon-Sterile\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eOrigin\u003c\/th\u003e \u003ctd\u003eMade in USA\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003ePrice\u003c\/th\u003e \u003ctd\u003e$48.24\/Bag ($0.0483\/tube)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eTechnical Narrative\u003c\/h2\u003e \u003cp\u003eThe Caplugs® Evergreen \u003cstrong\u003e214-3712-02S\u003c\/strong\u003e is a \u003cstrong\u003e0.25 mL Conical Microcentrifuge Tube\u003c\/strong\u003e in \u003cstrong\u003eLDPE\u003c\/strong\u003e (Natural), packaged 1000\/Bag. The 0.25 mL format is the smallest LDPE conical micro tube, suited for ultra-micro-scale reactions, PCR setup, and sample dilutions where LDPE's flexibility and low-extractable profile are required at minimal volume. LDPE's defining characteristic versus HDPE, PP, and PPC is its softness and flexibility — the tube walls flex under moderate finger pressure, enabling tube-squeeze dispensing techniques and reducing brittle-fracture risk during cryogenic handling below —80°C.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eLow-Density Polyethylene (LDPE)\u003c\/strong\u003e: Exceptional flexibility and softness — LDPE walls flex under finger pressure, allowing tube contents to be expressed by squeezing, and the soft body reduces brittle-fracture risk at cryogenic temperatures. LDPE is softer and more flexible than HDPE; HDPE is harder with lower extractables. LDPE's flexibility is the primary selection criterion when the protocol requires tube compression or very cold handling. LDPE's flexibility and low extractables make it suitable for PCR prep, though HDPE is preferred for the most extractable-sensitive qPCR applications. BPA-free, phthalate-free, FDA-compliant, \u003c\/p\u003e \u003cp\u003eProcurement economics: \u003cstrong\u003e$48.24\/Bag\u003c\/strong\u003e, \u003cstrong\u003e$0.0483\/tube\u003c\/strong\u003e. Volume pricing at 10+ bags. Siblings: \u003cstrong\u003e214-3714-020\u003c\/strong\u003e (0.4 mL LDPE 1000\/Bag); \u003cstrong\u003e214-3715-020\u003c\/strong\u003e (0.5 mL LDPE 1000\/Bag); \u003cstrong\u003e214-3417-020\u003c\/strong\u003e (0.25 mL HDPE Tethered 1000\/Bag). LabSupplies.com ships from USA inventory, typically same business day.\u003c\/p\u003e \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e \u003ctable\u003e \u003ctbody\u003e \u003ctr\u003e \u003cth\u003ePart Number\u003c\/th\u003e \u003ctd\u003e\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eCaplugs Item #\u003c\/th\u003e \u003ctd\u003e\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eCapacity\u003c\/th\u003e \u003ctd\u003e0.25 mL\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eGeometry\u003c\/th\u003e \u003ctd\u003eConical bottom microcentrifuge tube\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eMaterial\u003c\/th\u003e \u003ctd\u003eLow-Density Polyethylene (LDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eColor\u003c\/th\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eKey Property\u003c\/th\u003e \u003ctd\u003eExceptional flexibility and softness — LDPE walls flex under finger pressure, allowing tube contents to be expressed by squeezing, and the soft body reduces brittle-fracture risk at cryogenic temperatures\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eCap\u003c\/th\u003e \u003ctd\u003eSeparate snap cap (not tethered)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eSterility\u003c\/th\u003e \u003ctd\u003eNon-Sterile\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003ePack Size\u003c\/th\u003e \u003ctd\u003e1000\/Bag (0.25 mL conical micro tube, LDPE Natural, 1000\/Bag)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eApplication\u003c\/th\u003e \u003ctd\u003eUltra-micro PCR setup, dilution, cryogenic sample handling; LDPE flexibility for squeeze-dispensing\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eBPA \/ Phthalate\u003c\/th\u003e \u003ctd\u003eBPA-Free, Phthalate-Free, Latex-Free\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eCountry of Origin\u003c\/th\u003e \u003ctd\u003eUSA \u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003ePrice\u003c\/th\u003e \u003ctd\u003e$48.24\/Bag ($0.0483\/tube)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eConical Micro Tube (0.25 mL, LDPE) Compatible Workflows\u003c\/h2\u003e \u003cp\u003eThe is compatible with the following laboratory workflows.\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eApplication\u003c\/th\u003e \u003cth\u003ePlatform \/ Configuration\u003c\/th\u003e \u003cth\u003eNotes\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003cth\u003eMicrocentrifuge\u003c\/th\u003e \u003ctd\u003eBench microcentrifuge, up to ~14,000×g\u003c\/td\u003e \u003ctd\u003eConical tip; LDPE flex body; verify rotor adapter fits\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003ePCR reaction assembly\u003c\/th\u003e \u003ctd\u003eBench pipetting, micro-volume\u003c\/td\u003e \u003ctd\u003eLDPE: low extractables for PCR-sensitive protocols\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eSqueeze dispensing\u003c\/th\u003e \u003ctd\u003eManual tube compression\u003c\/td\u003e \u003ctd\u003eLDPE flexibility enables squeeze-to-dispense technique\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eCryogenic storage\u003c\/th\u003e \u003ctd\u003eLiquid nitrogen \/ —196°C, cryo rack\u003c\/td\u003e \u003ctd\u003eLDPE flexible at cryogenic temperatures; less brittle-fracture than rigid polymers\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eWater bath incubation\u003c\/th\u003e \u003ctd\u003eUp to ~60°C\u003c\/td\u003e \u003ctd\u003eLDPE thermal limit ~60°C; do not autoclave\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eSample dilution\u003c\/th\u003e \u003ctd\u003eManual micro-volume pipetting\u003c\/td\u003e \u003ctd\u003e0.25 mL conical for micro-scale dilution\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eMicro-extraction\u003c\/th\u003e \u003ctd\u003eAqueous extraction protocols\u003c\/td\u003e \u003ctd\u003eLDPE: aqueous compatibility; avoid concentrated ACN\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eChemical Resistance — Low-Density Polyethylene (LDPE)\u003c\/h2\u003e \u003cp\u003eCompatibility reference for LDPE at typical laboratory concentrations.\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eReagent \/ Sample Type\u003c\/th\u003e \u003cth\u003eCompatibility\u003c\/th\u003e \u003cth\u003eNotes\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003eAqueous buffers \/ saline\u003c\/td\u003e \u003ctd\u003eExcellent\u003c\/td\u003e \u003ctd\u003eCompatible across pH 4–12.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDilute acids (HCl, \u0026lt;10%)\u003c\/td\u003e \u003ctd\u003eGood\u003c\/td\u003e \u003ctd\u003eAdequate for standard lab dilutions.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDilute bases (NaOH, \u0026lt;10%)\u003c\/td\u003e \u003ctd\u003eGood\u003c\/td\u003e \u003ctd\u003eGood resistance at moderate concentration.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMethanol \/ ethanol (\u0026lt;50%)\u003c\/td\u003e \u003ctd\u003eGood\u003c\/td\u003e \u003ctd\u003eShort-term compatible.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAcetonitrile\u003c\/td\u003e \u003ctd\u003eLimited\u003c\/td\u003e \u003ctd\u003eAvoid prolonged contact; use PP or HDPE for ACN.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eEthyl acetate\u003c\/td\u003e \u003ctd\u003eLimited\u003c\/td\u003e \u003ctd\u003eShort-term compatible.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDichloromethane \/ chloroform\u003c\/td\u003e \u003ctd\u003eNot Compatible\u003c\/td\u003e \u003ctd\u003eCauses swelling; do not use.\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePCR \/ enzyme reagents\u003c\/td\u003e \u003ctd\u003eExcellent\u003c\/td\u003e \u003ctd\u003eLow extractables; flexible body; PCR-compatible.\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eClinical \u0026amp; Research Laboratory Applications\u003c\/h2\u003e \u003cp\u003eCaplugs® Evergreen 0.25 mL LDPE conical microcentrifuge tubes serve molecular biology, cryobiology, biochemistry, and forensic science laboratories requiring the flexibility and compressibility of LDPE in a standard conical micro tube format. 0.25 mL LDPE conical micro tubes serve molecular biology, forensic science, and cryobiology laboratories where LDPE's flexibility is a practical workflow advantage. The soft tube body enables squeeze-dispensing of micro-volume samples without a pipette — useful for dispensing viscous samples, transferring residual volumes from tube walls, and expressing complete contents from a micro tube into a reaction vessel. LDPE's flexibility at cryogenic temperatures (liquid nitrogen, —196°C) makes these tubes preferred over rigid HDPE or PP for samples stored in long-term liquid nitrogen cryopreservation.\u003c\/p\u003e \u003ch2\u003eU.S. Manufacturing, Quality \u0026amp; Institutional Procurement\u003c\/h2\u003e \u003cp\u003eCaplugs® Evergreen products are manufactured in the United States under ISO 9001 quality management from FDA-compliant, food-contact-grade resins. BPA-free, phthalate-free, and latex-free, with material-disclosure documentation supporting CAP, CLIA, and ISO 15189 laboratory accreditation audits.\u003c\/p\u003e \u003cp\u003eLabSupplies.com is an authorized dealer for the full Caplugs Evergreen catalog and ships directly from USA inventory — typically same business day for stocking SKUs. We offer below retail pricing on volume orders, tiered institutional and academic pricing, and direct support for grant-funded laboratories and government procurement channels. Lab managers and procurement officers can \u003ca href=\"#request-sample\"\u003erequest a written quote or speak with a product specialist\u003c\/a\u003e directly from our sales engineering team.\u003c\/p\u003e \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e \u003ch3\u003eAre the tubes sterile?\u003c\/h3\u003e \u003cp\u003eNo. The ships Non-Sterile. For sterility-critical applications, use aseptic technique or ask about gamma-sterilized options.\u003c\/p\u003e \u003ch3\u003eWhat is LDPE and how does it differ from HDPE and PP for micro tubes?\u003c\/h3\u003e \u003cp\u003eLDPE (Low-Density Polyethylene) has a lower polymer density and crystallinity than HDPE, producing a softer, more flexible tube body. LDPE walls flex under finger pressure — enabling squeeze-dispensing techniques — and remain flexible at cryogenic temperatures where HDPE and PP become more brittle. HDPE provides lower extractables (preferred for the most sensitive PCR assays) and higher rigidity. PP provides broader organic solvent compatibility. Choose LDPE when tube flexibility or cryogenic flexibility is the primary selection criterion.\u003c\/p\u003e \u003ch3\u003eWhat is the maximum temperature for LDPE micro tube incubation?\u003c\/h3\u003e \u003cp\u003eLDPE micro tubes are suitable for water bath and dry-block incubation up to approximately 60°C — similar to PS, and below PP's ~80°C limit. Do not autoclave LDPE tubes. For incubation above 60°C, use PP or PPC micro tubes. LDPE excels at the other extreme — its flexibility at cryogenic temperatures makes it preferable to HDPE and PP for liquid nitrogen storage.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\/\", \"@type\": \"Product\", \"name\": \"Caplugs® Evergreen 214-3712-02S | 0.25 mL Conical Microcentrifuge Tubes — LDPE, Natural, 1000\/Bag\", \"sku\": \"214371202SE1\", \"mpn\": \"214-3712-02S\", \"brand\": {\"@type\": \"Brand\", \"name\": \"Caplugs® Evergreen\"}, \"manufacturer\": {\"@type\": \"Organization\", \"name\": \"Caplugs® Evergreen\", \"address\": \"USA\"}, \"material\": \"Low-Density Polyethylene (LDPE)\", \"color\": \"Natural\", \"image\": \"https:\/\/prod-cp-cdn-images.azureedge.net\/catalog\/92300\/9093F9E9-0629-4E5F-B21B-39C8A1BB4B87\/214-3712-02S_01.jpg\", \"description\": \"Caplugs® Evergreen 214-3712-02S: 0.25 mL Conical Microcentrifuge Tubes, LDPE, Natural, 1000\/Bag. MADE IN USA, authorized dealer.\", \"additionalProperty\": [{\"@type\": \"PropertyValue\", \"name\": \"Capacity\", \"value\": \"0.25 mL\"}, {\"@type\": \"PropertyValue\", \"name\": \"Material\", \"value\": \"Low-Density Polyethylene (LDPE)\"}, {\"@type\": \"PropertyValue\", \"name\": \"Pack Size\", \"value\": \"1000\/Bag\"}, {\"@type\": \"PropertyValue\", \"name\": \"Sterility\", \"value\": \"Non-Sterile\"}, {\"@type\": \"PropertyValue\", \"name\": \"Origin\", \"value\": \"USA\"}], \"offers\": {\"@type\": \"Offer\", \"priceCurrency\": \"USD\", \"price\": \"48.24\", \"availability\": \"https:\/\/schema.org\/InStock\", \"url\": \"https:\/\/labsupplies.com\/products\/214-3712-02s-conical-microcentrifuge\"}}\u003c\/script\u003e \u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\/\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Are the 214-3712-02S tubes sterile?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. The 214-3712-02S ships Non-Sterile. 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LDPE excels at the other extreme — its flexibility at cryogenic temperatures makes it preferable to HDPE and PP for liquid nitrogen storage.\"}}]}\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48565325627624,"sku":"214371202SE1","price":48.24,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/214-3712-02S_01_32ffc490-eaed-42ae-b435-22d39c2fc89f.jpg?v=1778983846","url":"https:\/\/labsupplies.com\/products\/214-3712-02s-conical-microcentrifuge","provider":"LabSupplies.com","version":"1.0","type":"link"}