{"product_id":"caplugs-300-1999-020-perforated-top-sample-cup-caps-ldpe-natural","title":"4 mL Sample Cups, LDPE, Natural, Roche\/Beckman Compatible — 300-1999-020 | 1000\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003ePerforated Top Sample Cup Caps, LDPE, Natural — 300-1999-020 | 1000\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 300-1999-020\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\u003ePerforated 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\u003eNatural\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✓ Direct probe aspiration through cap\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eSealing\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003ePartial — perforations allow evaporation control\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$33.33 \/ Bag ($0.0334 \/ 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 natural Low-Density Polyethylene (LDPE) perforated top sample cup cap — the direct-aspiration closure for Caplugs® Evergreen 4 mL sample cups in auto-analyzer and high-throughput clinical laboratory workflows where removing the cap before every probe aspiration creates a throughput bottleneck and increases aerosol exposure risk. The perforated top allows analyzer aspiration probes to pierce directly through the cap into the sample cup contents — eliminating the decapping step in probe-based auto-analyzer loading workflows including Roche Cobas, Beckman AU\/DxC, Siemens Atellica, and Abbott Alinity chemistry analyzer series. The perforations also provide controlled evaporation during refrigerated staging — reducing sample concentration change during pre-analytical hold times versus fully open cups without the complete evaporation prevention of a flat cap.\u003c\/p\u003e \u003cp\u003eLDPE construction provides the flexibility required for consistent snap-on retention across the full temperature range of clinical laboratory sample cup handling — room temperature processing, 4°C refrigerated staging, and -20°C frozen storage. LDPE flex retention is the defining property for sample cup caps: rigid materials crack under the repeated snap-on\/snap-off cycles of high-volume clinical workflows, while LDPE maintains flexible snap engagement across thousands of cap applications without fracture or retention loss. LDPE's chemical inertness to urine, serum, plasma, and standard assay diluents ensures no cap material leaching into specimen contents.\u003c\/p\u003e \u003cp\u003eAt $33.33 per 1000\/Bag — $0.0334 per cap — the delivers perforated probe-pierce cap coverage at per-cap economics for high-volume auto-analyzer programs. For workflows requiring complete sealed closure before probe aspiration, see flat top caps: 300-1006-020 (Flat Top Natural, $25.96\/1000); 300-1006-B20 (Flat Top Blue, $25.96\/1000).\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\u003e3001999020E1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCap Type\u003c\/td\u003e \u003ctd\u003ePerforated 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\u003eNatural\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✓ Perforated top — probe-pierce without removal\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSealing\u003c\/td\u003e \u003ctd\u003ePartial closure — perforations control evaporation\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\u003ePerforated Top Cap Application Compatibility — \u003c\/h2\u003e \u003cp\u003eThe perforated 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\u003eDirect analyzer aspiration\u003c\/td\u003e \u003ctd\u003eProbe-based auto-analyzers (Cobas, Roche, AU)\u003c\/td\u003e \u003ctd\u003ePerforated top allows probe aspiration without cap removal\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSealed probe-pierce workflow\u003c\/td\u003e \u003ctd\u003eAspirating probes that pierce through the cap\u003c\/td\u003e \u003ctd\u003eEliminates uncapping step — analyzer probe pierces directly\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eEvaporation-controlled storage\u003c\/td\u003e \u003ctd\u003eCapped cups with limited evaporation during storage\u003c\/td\u003e \u003ctd\u003ePerforations allow controlled evaporation for analyzer compatibility\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eRefrigerated cup staging\u003c\/td\u003e \u003ctd\u003ePre-loaded sample cups staged for analyzer run\u003c\/td\u003e \u003ctd\u003ePerforated cap reduces carryover vs fully open cups during staging\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eBiofluid specimen handling\u003c\/td\u003e \u003ctd\u003eUrine, serum, plasma in closed analyzer workflow\u003c\/td\u003e \u003ctd\u003ePerforated cap supports closed-tube workflow without open cups\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMiddleware workflow integration\u003c\/td\u003e \u003ctd\u003eSample cup with cap in LIS-integrated batch runs\u003c\/td\u003e \u003ctd\u003ePerforated cap compatible with auto-loader cup-handling systems\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eReduced contamination workflow\u003c\/td\u003e \u003ctd\u003eHigh-throughput lab with covered sample staging\u003c\/td\u003e \u003ctd\u003ePerforated cap reduces aerosol exposure vs fully open sample cups\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCAP\/CLIA accreditation workflows\u003c\/td\u003e \u003ctd\u003eClosed-system specimen handling documentation\u003c\/td\u003e \u003ctd\u003ePerforated cap supports closed-system pre-analytical documentation\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003ePerforated caps allow probe aspiration without cap removal — confirm probe tip diameter against perforation diameter before use.\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 chemistry and immunoassay laboratory programs using probe-based auto-analyzers with 4 mL sample cups; high-throughput clinical laboratory programs reducing decapping throughput bottlenecks; laboratories running CAP\/CLIA-accredited closed-system specimen handling protocols; reference labs running batch auto-analyzer loads with refrigerated pre-staged capped sample cups; and any auto-analyzer workflow where probe-pierce-without-removal capability is a workflow requirement.\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 is the difference between the perforated top cap and the flat top cap?\u003c\/h3\u003e \u003cp\u003eFlat top caps (300-1006-020 Natural, 300-1006-B20 Blue, 300-1006-R20 Red) provide complete sealed closure — probe aspiration requires cap removal first. Perforated top caps  have pre-made perforations that allow analyzer aspiration probes to pierce directly through the cap without removal. Choose perforated caps for probe-pierce auto-analyzer workflows where eliminating the decapping step increases throughput. Choose flat caps for complete evaporation prevention and storage\/transport workflows where probe access is not required.\u003c\/p\u003e \u003ch3\u003eWhich auto-analyzer probe sizes are compatible with the perforated cap?\u003c\/h3\u003e \u003cp\u003eThe perforation diameter in the is designed for standard auto-analyzer aspiration probe sizes in the 1.5–2.5 mm diameter range — the standard for Roche Cobas (c, e, p series), Beckman AU\/DxC, Siemens Atellica, and Abbott Alinity chemistry analyzers. Always validate probe-to-perforation fit with a sample cap before large-volume purchase if your analyzer uses non-standard probe dimensions.\u003c\/p\u003e \u003ch3\u003eAre the perforated caps compatible with pneumatic tube transport of sample cups?\u003c\/h3\u003e \u003cp\u003eLDPE perforated caps are compatible with pneumatic tube transport of sample cups — LDPE flex retention maintains snap-on engagement through the acceleration and deceleration forces of pneumatic tube systems. The perforations may allow minor evaporation during extended transport — for long pneumatic tube runs where evaporation is a concern, flat top caps provide better evaporation prevention during transport, with perforated caps applied before analyzer loading.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Perforated Top Sample Cup Caps, Non-Sterile, Low-Density Polyethylene (LDPE), Natural \\u2014 300-1999-020 | 1000\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 300-1999-020. Perforated top LDPE sample cup caps, natural, 1000\/Bag. Direct probe aspiration without cap removal. BPA-free. USA.\",\n  \"sku\": \"3001999020E1\",\n  \"mpn\": \"300-1999-020\",\n  \"material\": \"Low-Density Polyethylene (LDPE)\",\n  \"color\": \"Natural\",\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\": \"33.33\",\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 is the difference between the perforated top cap and the flat top cap?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Flat top caps (300-1006-020 Natural, 300-1006-B20 Blue, 300-1006-R20 Red) provide complete sealed closure \\u2014 probe aspiration requires cap removal first. Perforated top caps (300-1999-020) have pre-made perforations that allow analyzer aspiration probes to pierce directly through the cap without removal. Choose perforated caps for probe-pierce auto-analyzer workflows where eliminating the decapping step increases throughput. Choose flat caps for complete evaporation prevention and storage\/transport workflows where probe access is not required.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Which auto-analyzer probe sizes are compatible with the 300-1999-020 perforated cap?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The perforation diameter in the 300-1999-020 is designed for standard auto-analyzer aspiration probe sizes in the 1.5\\u20132.5 mm diameter range \\u2014 the standard for Roche Cobas (c, e, p series), Beckman AU\/DxC, Siemens Atellica, and Abbott Alinity chemistry analyzers. Always validate probe-to-perforation fit with a sample cap before large-volume purchase if your analyzer uses non-standard probe dimensions.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are the perforated caps compatible with pneumatic tube transport of sample cups?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"LDPE perforated caps are compatible with pneumatic tube transport of sample cups \\u2014 LDPE flex retention maintains snap-on engagement through the acceleration and deceleration forces of pneumatic tube systems. The perforations may allow minor evaporation during extended transport \\u2014 for long pneumatic tube runs where evaporation is a concern, flat top caps provide better evaporation prevention during transport, with perforated caps applied before analyzer loading.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48567083041000,"sku":"300-1999-020","price":33.33,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-1999-020_01.jpg?v=1779031347","url":"https:\/\/labsupplies.com\/products\/caplugs-300-1999-020-perforated-top-sample-cup-caps-ldpe-natural","provider":"LabSupplies.com","version":"1.0","type":"link"}