{"product_id":"214-2099-b50-round-bottom-screw-cap-tube","title":"Round Bottom Test Tubes, 21 mL, 16 x 150 mm, Polystyrene, Blue Screw Caps, Natural, 1000\/Bag | Caplugs® Evergreen","description":"\u003ch1\u003eCaplugs® Evergreen 21 mL Round Bottom Test Tubes with Blue Screw Caps, 16 x 150 mm, Polystyrene, Natural, 1000\/Bag\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eCaplugs® Evergreen 21 mL Round Bottom Test Tubes\u003c\/strong\u003e deliver clear, crack-resistant polystyrene tubes in a 16 x 150 mm format with leak-resistant blue screw caps, ideal for sample collection, serial dilutions, and routine clinical and diagnostic handling. Each tube offers excellent optical clarity for visual inspection and turbidity reads. Shipped unassembled, this bulk 1000\/Bag pack suits high-throughput benches.\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 (with Screw Caps)\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), Natural\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eClosure\/Cap\u003c\/th\u003e\n\u003ctd\u003eBlue Screw Cap (supplied unassembled)\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 short-term specimen storage\u003c\/li\u003e\n\u003cli\u003eSerial dilutions and reagent preparation at the bench\u003c\/li\u003e\n\u003cli\u003eVisual turbidity and colorimetric reads requiring clear walls\u003c\/li\u003e\n\u003cli\u003eClinical and diagnostic aliquoting in screw-capped tubes\u003c\/li\u003e\n\u003cli\u003eGeneral chemistry and microbiology workflow staging\u003c\/li\u003e\n\u003cli\u003eHigh-throughput tube handling in rack-based batches\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, with these tubes Made in USA. Bags carry lot numbers to support traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available for bulk and standing orders.\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 are non-sterile and are intended for general laboratory use. For applications requiring sterility, validate an appropriate decontamination method compatible with polystyrene.\u003c\/p\u003e\n\u003ch3\u003eDo the tubes ship with caps attached?\u003c\/h3\u003e\n\u003cp\u003eThe tubes ship unassembled, meaning the blue screw caps are packed separately within the 1000\/Bag pack rather than pre-fitted, so you cap them as needed at the point of use.\u003c\/p\u003e\n\u003ch3\u003eWhat are the tube dimensions and capacity?\u003c\/h3\u003e\n\u003cp\u003eEach tube measures 16 x 150 mm with a round bottom and a nominal capacity of 21 mL, a standard format that fits common 16 mm tube racks and instrument carriers.\u003c\/p\u003e\n\u003ch3\u003eIs polystyrene suitable for my reagents?\u003c\/h3\u003e\n\u003cp\u003ePolystyrene offers excellent clarity and rigidity but has limited resistance to many organic solvents. Confirm reagent compatibility with PS before use; for aggressive solvents, choose a polypropylene tube instead.\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 with Blue Screw Caps, 16 x 150 mm, Polystyrene, Natural, 1000\/Bag\",\n  \"sku\": \"214-2099-B50\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Caplugs® Evergreen\"\n  },\n  \"countryOfOrigin\": \"USA\",\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"priceCurrency\": \"USD\",\n    \"price\": \"211.60\",\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 are non-sterile and are intended for general laboratory use. 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