{"product_id":"214-2097-010-round-bottom-test-tube","title":"Round Bottom Test Tubes, Polystyrene, 16 x 150 mm, 21 mL, Natural, 1000\/Bag | Caplugs® Evergreen","description":"\u003ch1\u003eCaplugs® Evergreen 21 mL Round Bottom Test Tubes, Polystyrene, 16 x 150 mm, Natural, 1000\/Bag\u003c\/h1\u003e\n\u003cp\u003eThese \u003cstrong\u003e21 mL Round Bottom Test Tubes\u003c\/strong\u003e are molded from clear polystyrene in a standard 16 x 150 mm format, giving labs an economical, single-use vessel for sample collection, reagent dispensing, and routine clinical and microbiology workflows. Natural-clarity PS walls support easy visual inspection of liquid levels and turbidity, while the round bottom suits standard rack and centrifuge adapter setups.\u003c\/p\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eRound Bottom Test Tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eVolume\/Size\u003c\/th\u003e\n\u003ctd\u003e21 mL, 16 x 150 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003ePolystyrene (PS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eNatural\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSterility\u003c\/th\u003e\n\u003ctd\u003eNon-Sterile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack Size\u003c\/th\u003e\n\u003ctd\u003e1000\/Bag\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCountry of Origin\u003c\/th\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\u003eRoutine sample collection and aliquoting in clinical and research labs\u003c\/li\u003e\n\u003cli\u003eReagent and buffer dispensing where single-use disposables reduce cross-contamination\u003c\/li\u003e\n\u003cli\u003eMicrobiology dilution series and broth handling\u003c\/li\u003e\n\u003cli\u003eOptical density and turbidity checks through clear PS walls\u003c\/li\u003e\n\u003cli\u003eSpecimen transport within standard 16 mm tube racks\u003c\/li\u003e\n\u003cli\u003eGeneral benchtop mixing and short-term sample holding\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 from US inventory, and these tubes are Made in USA. Each bag carries lot numbers to support traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available for high-volume and recurring procurement.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eAre these test tubes sterile?\u003c\/h3\u003e\n\u003cp\u003eNo. These tubes ship non-sterile, which suits general reagent handling, dilutions, and non-critical sample work. For aseptic applications, sterilize compatibly with polystyrene or select a pre-sterilized product.\u003c\/p\u003e\n\u003ch3\u003eCan polystyrene tubes be autoclaved?\u003c\/h3\u003e\n\u003cp\u003eNo. Polystyrene is not autoclavable and will deform under standard steam cycles. These tubes are intended as economical single-use disposables for non-sterile workflows.\u003c\/p\u003e\n\u003ch3\u003eWhat are the exact dimensions of each tube?\u003c\/h3\u003e\n\u003cp\u003eEach tube measures 16 x 150 mm with a round bottom and a working capacity of 21 mL, fitting standard 16 mm racks and tube holders.\u003c\/p\u003e\n\u003ch3\u003eHow many tubes are in a pack, and how is pricing structured?\u003c\/h3\u003e\n\u003cp\u003eEach unit is sold as 1000\/Bag, and the listed price is per pack. Institutional and grant-funded tiered pricing is available for larger orders.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Caplugs® Evergreen 21 mL Round Bottom Test Tubes, Polystyrene, 16 x 150 mm, Natural, 1000\/Bag\",\n  \"sku\": \"214-2097-010\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Caplugs® Evergreen\"\n  },\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"priceCurrency\": \"USD\",\n    \"price\": \"245.39\",\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 test tubes sterile?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"No. These tubes ship non-sterile, which suits general reagent handling, dilutions, and non-critical sample work. 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