{"product_id":"caplugs-300-1006-b20-flat-top-sample-cup-caps-ldpe-blue","title":"4 mL Sample Cups, LDPE, Blue, Cobas® Compatible — 300-1006-B20 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eFlat Top Sample Cup Caps, LDPE, Blue — 300-1006-B20 | 1000\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 300-1006-B20\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eCap Type\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eFlat Top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eLow-Density Polyethylene (LDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eBlue\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eCup Compat.\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eFits Caplugs® Evergreen 4 mL round-bottom sample cups\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eProbe Access\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e✗ Cap removal required before probe aspiration\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eSealing\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e✓ Full sealed closure\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eSterility\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eNon-Sterile\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePack Size\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e1000 \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e$25.96 \/ Bag ($0.0260 \/ cap)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eTechnical Narrative\u003c\/h2\u003e \u003cp\u003eThe Caplugs® Evergreen is a blue Low-Density Polyethylene (LDPE) flat top sample cup cap — the standard sealed closure for Caplugs® Evergreen 4 mL sample cups used in urinalysis, clinical chemistry, and serology workflows. The flat top LDPE cap snaps onto the sample cup rim with positive retention, providing a complete sealed closure that prevents evaporation during refrigerated storage, pneumatic tube transport, and pre-analytical staging. Blue caps enable color-coded specimen routing — blue is widely used in clinical laboratory workflows to designate urine specimens, differentiating them from serum (red) and general-purpose (natural) cup batches on the processing bench and in auto-analyzer loading racks.\u003c\/p\u003e \u003cp\u003eLDPE construction delivers the defining performance property for sample cup caps: flexible snap-on retention that maintains engagement across the full temperature range of clinical laboratory sample handling — room temperature processing, 4°C refrigerated staging, and -20°C frozen cup storage — without the brittleness that causes rigid plastic caps to fracture under repeated snap-on\/snap-off cycles in high-volume clinical workflows. LDPE's chemical inertness to urine, serum, plasma, and standard assay diluents ensures no cap material leaching into specimen contents at storage temperatures.\u003c\/p\u003e \u003cp\u003eAt $25.96 per 1000\/Bag — $0.0260 per cap — the delivers flat top sample cup capping at per-cap economics for high-volume clinical programs. Also available: 300-1006-020 (Natural, $25.96\/1000); 300-1006-R20 (Red, $25.96\/1000). For probe-pierce-without-removal cap format, see perforated top caps (300-1999-020).\u003c\/p\u003e \u003ch2\u003eTechnical Specifications — Caplugs® Evergreen \u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eSpecification\u003c\/th\u003e \u003cth\u003eValue\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003ePart Number\u003c\/td\u003e \u003ctd\u003e\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCaplugs Item #\u003c\/td\u003e \u003ctd\u003e3001006B20E1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCap Type\u003c\/td\u003e \u003ctd\u003eFlat Top\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMaterial\u003c\/td\u003e \u003ctd\u003eLow-Density Polyethylene (LDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor\u003c\/td\u003e \u003ctd\u003eBlue\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCup Compat.\u003c\/td\u003e \u003ctd\u003eCaplugs® Evergreen 4 mL round-bottom and flat-bottom sample cups\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eProbe Access\u003c\/td\u003e \u003ctd\u003e✗ Remove cap before probe aspiration\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSealing\u003c\/td\u003e \u003ctd\u003eFull sealed closure\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSterility\u003c\/td\u003e \u003ctd\u003eNon-Sterile\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePack Size\u003c\/td\u003e \u003ctd\u003e1000 \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eBPA\/Phthalate\u003c\/td\u003e \u003ctd\u003eBPA-free; no phthalate plasticizers\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCountry of Origin\u003c\/td\u003e \u003ctd\u003eMade in U.S.A. (California)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eFlat Top Cap Application Compatibility — \u003c\/h2\u003e \u003cp\u003eThe flat top LDPE cap fits Caplugs® Evergreen 4 mL sample cups for the following workflows:\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eApplication\u003c\/th\u003e \u003cth\u003eSpecimen \/ Use\u003c\/th\u003e \u003cth\u003eNotes\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003eSample cup sealing (flat cap)\u003c\/td\u003e \u003ctd\u003e4 mL round-bottom sample cups (127-0017 family)\u003c\/td\u003e \u003ctd\u003eFlat LDPE cap snaps onto sample cup rim for sealed storage\/transport\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eUrinalysis cup capping\u003c\/td\u003e \u003ctd\u003eRandom urine sample cups in auto-analyzer workflow\u003c\/td\u003e \u003ctd\u003eFlat cap seals cup during centrifugation and before analyzer loading\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSerum \/ plasma cup storage\u003c\/td\u003e \u003ctd\u003ePrimary tube-derived serum\/plasma cups\u003c\/td\u003e \u003ctd\u003eFlat cap prevents evaporation during refrigerated storage\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAuto-analyzer sample cups\u003c\/td\u003e \u003ctd\u003eDiscrete analysis auto-analyzers (Cobas, AU series)\u003c\/td\u003e \u003ctd\u003eFlat cap for capped sample cup staging before analyzer aspiration\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor-coded specimen routing\u003c\/td\u003e \u003ctd\u003eBlue cap = urine; Red cap = serum; Natural = general\u003c\/td\u003e \u003ctd\u003eColor cap enables visual specimen-type routing in high-volume labs\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSample cup transit\u003c\/td\u003e \u003ctd\u003eSpecimen cups in pneumatic tube transport systems\u003c\/td\u003e \u003ctd\u003eLDPE flat cap withstands pneumatic tube transport forces\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eArchiving capped cups\u003c\/td\u003e \u003ctd\u003eCapped specimen cups in refrigerated archive\u003c\/td\u003e \u003ctd\u003eFlat cap reduces evaporation during extended refrigerated storage\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePoint-of-care sample prep\u003c\/td\u003e \u003ctd\u003ePOC specimen collection to analyzer cup transfer\u003c\/td\u003e \u003ctd\u003eFlat cap seals cup during patient-side collection and transport\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eFlat caps provide complete closure. Remove cap before probe aspiration. LDPE flexibility ensures positive snap-on fit without cracking across the full temperature range of sample cup storage.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eChemical Resistance — Low-Density Polyethylene (LDPE)\u003c\/h2\u003e \u003cp\u003eLDPE provides excellent flexibility, snap-on retention, and broad aqueous specimen compatibility. Not autoclave-compatible.\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eReagent \/ Condition\u003c\/th\u003e \u003cth\u003eCompatibility\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003eUrine (all types)\u003c\/td\u003e \u003ctd\u003e✓ Excellent\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSerum \/ plasma\u003c\/td\u003e \u003ctd\u003e✓ Excellent\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAqueous buffers\u003c\/td\u003e \u003ctd\u003e✓ Excellent\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDilute acids (\u0026lt;10%)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDilute alkalies (pH \u0026lt;12)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eShort-chain alcohols (brief)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDMSO (≤10%)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eConcentrated organic solvents\u003c\/td\u003e \u003ctd\u003e✗ Not recommended\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutoclave (121°C)\u003c\/td\u003e \u003ctd\u003e✗ Not compatible — LDPE softens\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eUV sterilization\u003c\/td\u003e \u003ctd\u003e✓ Compatible\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eLaboratory Applications\u003c\/h2\u003e \u003cp\u003eThe serves clinical urinalysis labs capping urine sample cups after collection; clinical chemistry programs staging capped serum\/plasma cups for auto-analyzer runs; point-of-care collection programs capping specimen cups during patient transport; reference laboratory programs using color-coded caps for specimen-type visual routing; and any high-volume clinical laboratory program requiring sealed, color-coded sample cup closure.\u003c\/p\u003e \u003ch2\u003eU.S. Manufacturing, Quality \u0026amp; Institutional Procurement\u003c\/h2\u003e \u003cp\u003eEvery Caplugs® Evergreen lot is precision-molded at our California manufacturing facility and subject to rigorous dimensional inspection and material purity verification. We supply reference laboratories, hospital systems, and federal procurement offices under institutional pricing programs with blanket-order support and same-day shipping on stocked inventory. \u003ca href=\"#request-sample\"\u003eRequest a sample below\u003c\/a\u003e to validate fit before committing to volume.\u003c\/p\u003e \u003ch2\u003eFrequently Asked Questions — Caplugs® Evergreen \u003c\/h2\u003e \u003ch3\u003eWhat sample cup formats are compatible with the cap?\u003c\/h3\u003e \u003cp\u003eThe flat top LDPE cap is designed for Caplugs® Evergreen 4 mL round-bottom sample cups (127-0017 family) and 4 mL flat-bottom sample cups (127-0018). The LDPE snap retention provides positive engagement across the cup rim. Always validate cap-to-cup fit with a sample set before bulk purchase if using cups from other manufacturers — cup rim dimensions vary.\u003c\/p\u003e \u003ch3\u003eWhen should I use Blue caps versus Natural or the other color?\u003c\/h3\u003e \u003cp\u003eAll three flat top LDPE caps are identical in material and performance — the color difference is for specimen-type visual routing only. Natural (300-1006-020): general-purpose default, used with secondary barcode or label identification. Blue : designates urine specimens in color-coded routing systems — mirrors the blue-top convention for urine in many clinical laboratories. Red (300-1006-R20): designates serum\/plasma specimens — mirrors the CLSI H3 red-top serum tube convention. Choose color based on your laboratory's specimen-routing color-coding protocol.\u003c\/p\u003e \u003ch3\u003eWhat is the difference between flat top caps and perforated top caps?\u003c\/h3\u003e \u003cp\u003eFlat top caps (this product) provide complete sealed closure — cap removal is required before probe aspiration in auto-analyzers. Perforated top caps (300-1999-020) have pre-made perforations that allow analyzer probes to pierce directly through the cap without removal. Choose flat top for complete evaporation prevention during storage and transport. Choose perforated for probe-pierce auto-analyzer workflows where eliminating the decapping step improves throughput.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Flat Top Sample Cup Caps, Non-Sterile, Low-Density Polyethylene (LDPE), Blue \\u2014 300-1006-B20 | 1000\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 300-1006-B20. Flat top LDPE sample cup caps, blue, 1000\/Bag. Fits 4 mL round-bottom sample cups. BPA-free. USA.\",\n  \"sku\": \"3001006B20E1\",\n  \"mpn\": \"300-1006-B20\",\n  \"material\": \"Low-Density Polyethylene (LDPE)\",\n  \"color\": \"Blue\",\n  \"brand\": {\n    \"@type\": \"Brand\",\n    \"name\": \"Caplugs\\u00ae Evergreen\"\n  },\n  \"manufacturer\": {\n    \"@type\": \"Organization\",\n    \"name\": \"Caplugs\\u00ae Evergreen\",\n    \"address\": {\n      \"@type\": \"PostalAddress\",\n      \"addressCountry\": \"US\",\n      \"addressRegion\": \"CA\"\n    }\n  },\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"price\": \"25.96\",\n    \"priceCurrency\": \"USD\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"itemCondition\": \"https:\/\/schema.org\/NewCondition\",\n    \"seller\": {\n      \"@type\": \"Organization\",\n      \"name\": \"LabSupplies\"\n    }\n  },\n  \"additionalProperty\": [\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Pack Size\",\n      \"value\": \"1000 \/ Bag\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Sterility\",\n      \"value\": \"Non-Sterile\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Country of Origin\",\n      \"value\": \"United States\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"BPA Free\",\n      \"value\": \"Yes\"\n    }\n  ]\n}\n\u003c\/script\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What sample cup formats are compatible with the 300-1006-B20 cap?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 300-1006-B20 flat top LDPE cap is designed for Caplugs\\u00ae Evergreen 4 mL round-bottom sample cups (127-0017 family) and 4 mL flat-bottom sample cups (127-0018). The LDPE snap retention provides positive engagement across the cup rim. Always validate cap-to-cup fit with a sample set before bulk purchase if using cups from other manufacturers \\u2014 cup rim dimensions vary.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"When should I use Blue caps versus Natural or the other color?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"All three flat top LDPE caps are identical in material and performance \\u2014 the color difference is for specimen-type visual routing only. Natural (300-1006-020): general-purpose default, used with secondary barcode or label identification. Blue (300-1006-B20): designates urine specimens in color-coded routing systems \\u2014 mirrors the blue-top convention for urine in many clinical laboratories. Red (300-1006-R20): designates serum\/plasma specimens \\u2014 mirrors the CLSI H3 red-top serum tube convention. Choose color based on your laboratory's specimen-routing color-coding protocol.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between flat top caps and perforated top caps?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Flat top caps (this product) provide complete sealed closure \\u2014 cap removal is required before probe aspiration in auto-analyzers. Perforated top caps (300-1999-020) have pre-made perforations that allow analyzer probes to pierce directly through the cap without removal. Choose flat top for complete evaporation prevention during storage and transport. Choose perforated for probe-pierce auto-analyzer workflows where eliminating the decapping step improves throughput.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48567082975464,"sku":"300-1006-B20","price":25.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-1006-B20_01.jpg?v=1779031340","url":"https:\/\/labsupplies.com\/products\/caplugs-300-1006-b20-flat-top-sample-cup-caps-ldpe-blue","provider":"LabSupplies.com","version":"1.0","type":"link"}