{"product_id":"214-2012-r10-round-bottom-test-tube","title":"Round Bottom Test Tubes, 5 mL, 12 x 75 mm, Polystyrene (PS), Red, 1000\/Bag | Caplugs® Evergreen","description":"\u003ch1\u003eCaplugs® Evergreen 5 mL Round Bottom Test Tubes, 12 x 75 mm, Polystyrene (PS), Red, 1000\/Bag\u003c\/h1\u003e\n\u003cp\u003eThese \u003cstrong\u003e5 mL round bottom test tubes\u003c\/strong\u003e are molded from clear polystyrene in the standard 12 x 75 mm format, with a red tint for sample coding and tray organization. Bench teams reach for them in routine immunoassay setup, flow cytometry sample staining, and general clinical specimen handling where a disposable, single-use vessel keeps workflows clean.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eRound Bottom Test Tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume\/Size\u003c\/td\u003e\n\u003ctd\u003e5.0 mL, 12 x 75 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePolystyrene (PS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClosure\/Cap\u003c\/td\u003e\n\u003ctd\u003eNone (tubes supplied without caps)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eRed\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\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\/table\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFlow cytometry sample staining and resuspension in the 12 x 75 mm rack format\u003c\/li\u003e\n\u003cli\u003eImmunoassay and ELISA reagent aliquoting prior to plating\u003c\/li\u003e\n\u003cli\u003eRoutine clinical specimen collection and aliquot handling\u003c\/li\u003e\n\u003cli\u003eColor-coded sample tracking across batched bench runs\u003c\/li\u003e\n\u003cli\u003eSerial dilution and reagent prep where an inert disposable tube is preferred\u003c\/li\u003e\n\u003cli\u003eGeneral hematology and microbiology aliquot storage at ambient temperature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eQuality \u0026amp; Procurement\u003c\/h2\u003e\n\u003cp\u003elabsupplies.com is an authorized Caplugs® Evergreen dealer shipping these tubes from US inventory, and the product is Made in USA. Each bag carries lot numbers so traceability is documented for CAP-, CLIA-, and ISO 15189-accredited labs. Institutional and grant-funded tiered pricing is available on bulk orders — contact our team for volume quotes.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eAre these tubes sterile?\u003c\/h3\u003e\n\u003cp\u003eNo. These tubes are supplied non-sterile, which suits reagent prep, dilutions, and most routine bench work. For applications requiring sterility, autoclaving is not recommended because polystyrene has a low heat-deflection point.\u003c\/p\u003e\n\u003ch3\u003eWhat is the rim style and do they come with caps?\u003c\/h3\u003e\n\u003cp\u003eThe 12 x 75 mm round bottom tubes are supplied without caps. Standard 12 mm push-on or snap caps sized for 12 x 75 mm tubes can be ordered separately if a closure is required.\u003c\/p\u003e\n\u003ch3\u003eCan polystyrene tubes be used in a centrifuge?\u003c\/h3\u003e\n\u003cp\u003ePolystyrene tolerates only low-speed centrifugation; consult your rotor's g-force limits before spinning. For higher relative centrifugal force, a polypropylene tube is the more appropriate choice.\u003c\/p\u003e\n\u003ch3\u003eWhy choose the red-tinted version?\u003c\/h3\u003e\n\u003cp\u003eThe red tint supports visual color-coding so analysts can distinguish sample sets, controls, or workflow stages at a glance in shared 12 x 75 mm racks, reducing mix-ups during batched runs.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Caplugs® Evergreen 5 mL Round Bottom Test Tubes, 12 x 75 mm, Polystyrene (PS), Red, 1000\/Bag\",\n  \"sku\": \"214-2012-R10\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Caplugs® Evergreen\"\n  },\n  \"countryOfOrigin\": \"USA\",\n  \"material\": \"Polystyrene (PS)\",\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"priceCurrency\": \"USD\",\n    \"price\": \"63.50\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"seller\": {\n      \"@type\": \"Organization\",\n      \"name\": \"labsupplies.com\"\n    }\n  }\n}\n\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are these tubes sterile?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. These tubes are supplied non-sterile, which suits reagent prep, dilutions, and most routine bench work. For applications requiring sterility, autoclaving is not recommended because polystyrene has a low heat-deflection point.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the rim style and do they come with caps?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 12 x 75 mm round bottom tubes are supplied without caps. Standard 12 mm push-on or snap caps sized for 12 x 75 mm tubes can be ordered separately if a closure is required.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can polystyrene tubes be used in a centrifuge?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Polystyrene tolerates only low-speed centrifugation; consult your rotor's g-force limits before spinning. 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