{"product_id":"caplugs-300-3008-020-false-bottom-tube-screw-caps-hdpe-natural","title":"100–300 µL Sample Cups, Screw Caps, HDPE, Natural — 300-3008-020 | 1500\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eFalse Bottom Tube Screw Caps, HDPE, Natural — 300-3008-020 | 1500\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 300-3008-020\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eProduct\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eFalse Bottom Tube Screw Cap\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eCap Type\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eScrew cap with internal false bottom insert\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eHigh-Density Polyethylene (HDPE)\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\u003ePrimary Use\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eMicro-volume sample conservation and dead-volume reduction\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eKey Benefit\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eFalse bottom raises well floor — reduces minimum aspiratable volume\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eAutoclave\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e✓ Compatible (HDPE)\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\u003e1500 \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e$124.48 \/ Bag ($0.0830 \/ 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 High-Density Polyethylene (HDPE) false bottom tube screw cap — a precision-engineered tube closure with an internal false bottom insert that raises the effective well floor of standard test tubes, reducing the minimum sample volume required for automated analyzer aspiration. Auto-analyzers have a fixed dead volume — the minimum volume that must be present in the sample tube for the probe to aspirate without drawing air. In standard tubes without a false bottom, this dead volume is wasted specimen that cannot be analyzed. The false bottom raises the well floor to meet the probe at a smaller total volume — enabling complete analysis from micro-volume specimens that would otherwise be insufficient for the analyzer's minimum sample requirement.\u003c\/p\u003e \u003cp\u003eThis is the critical application for pediatric and neonatal clinical chemistry: fingerstick blood draws and heel-stick collections from neonates yield volumes as low as 100–300 µL — far less than the dead volume of standard clinical chemistry tubes. A false bottom cap concentrates this micro-volume at the well bottom, allowing the analyzer probe to aspirate the complete sample without dead-volume loss. The screw-cap closure provides a secure, leak-free seal during centrifugation (for serum separation) and refrigerated storage before analysis. HDPE construction provides autoclave compatibility for pre-sterilized supply, broad chemical resistance to clinical specimen matrices, and the rigidity required for consistent screw-cap engagement over repeated use cycles.\u003c\/p\u003e \u003cp\u003eAt $124.48 per 1500\/Bag — $0.0830 per cap — the delivers false-bottom micro-volume conservation at per-cap economics for high-volume pediatric and neonatal specimen processing programs.\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\u003e3003008020E1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eProduct Type\u003c\/td\u003e \u003ctd\u003eFalse Bottom Tube Screw Cap\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCap Style\u003c\/td\u003e \u003ctd\u003eScrew cap (threaded engagement) with false bottom insert\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMaterial\u003c\/td\u003e \u003ctd\u003eHigh-Density Polyethylene (HDPE)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor\u003c\/td\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eFalse Bottom\u003c\/td\u003e \u003ctd\u003eInternal insert raises well floor to reduce dead volume\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutoclave\u003c\/td\u003e \u003ctd\u003e✓ Compatible (121°C \/ 15 psi) — HDPE\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\u003e1500 \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eApplication\u003c\/td\u003e \u003ctd\u003eMicro-volume sample conservation, analyzer dead-volume reduction\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\u003eFalse Bottom Cap Application Compatibility — \u003c\/h2\u003e \u003cp\u003eThe false bottom screw cap reduces dead volume in standard test tubes for the following micro-volume applications:\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 volume reduction\u003c\/td\u003e \u003ctd\u003eReducing dead volume in test tubes for micro-analysis\u003c\/td\u003e \u003ctd\u003eFalse bottom raises well floor — analyzer aspirates from smaller vol\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePediatric sample conservation\u003c\/td\u003e \u003ctd\u003eMicro-volume pediatric specimen processing\u003c\/td\u003e \u003ctd\u003eFalse bottom enables analysis from minimal sample volume\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMicro-volume chemistry runs\u003c\/td\u003e \u003ctd\u003eClinical chemistry analyzers with 200–500 µL dead vol\u003c\/td\u003e \u003ctd\u003eFalse bottom reduces minimum sample volume for analyzer aspiration\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eNeonatal specimen analysis\u003c\/td\u003e \u003ctd\u003eNeonatal blood chemistry, critically low volume\u003c\/td\u003e \u003ctd\u003eFalse bottom critical for neonatal specimen micro-volume access\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePrecious research samples\u003c\/td\u003e \u003ctd\u003eRare biobank samples, limited-volume specimens\u003c\/td\u003e \u003ctd\u003eMinimize wasted volume in standard test tubes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAnalyzer dead-volume reduction\u003c\/td\u003e \u003ctd\u003eAuto-analyzer aspiration from low-volume samples\u003c\/td\u003e \u003ctd\u003eScrew cap provides sealed access; false bottom positions sample\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCentrifugation with volume ctrl\u003c\/td\u003e \u003ctd\u003eSerum separation with false-bottom volume limit\u003c\/td\u003e \u003ctd\u003eScrew cap seals during centrifugation; false bottom limits volume\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePOC micro-sample analysis\u003c\/td\u003e \u003ctd\u003ePoint-of-care fingerstick or capillary sample tubes\u003c\/td\u003e \u003ctd\u003eFalse bottom positions micro-volume at aspiration height\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eFalse bottom insert height is fixed — confirm compatibility with your specific tube format and analyzer probe depth specification before bulk purchase. Request a sample to validate probe-to-insert clearance with your analyzer before volume commitment.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eChemical Resistance — High-Density Polyethylene (HDPE)\u003c\/h2\u003e \u003cp\u003eHDPE provides broad chemical resistance and autoclave compatibility — superior to LDPE for screw-cap closure applications.\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\u003eAqueous buffers \/ water\u003c\/td\u003e \u003ctd\u003e✓ Excellent\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSerum \/ plasma \/ urine\u003c\/td\u003e \u003ctd\u003e✓ Excellent\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\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\u003eDMSO (≤10%)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutoclave (121°C)\u003c\/td\u003e \u003ctd\u003e✓ Compatible — HDPE more rigid than LDPE\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eStorage at -20°C\u003c\/td\u003e \u003ctd\u003e✓ Suitable\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 \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eLaboratory Applications\u003c\/h2\u003e \u003cp\u003eThe serves neonatal and pediatric clinical chemistry laboratories processing micro-volume heel-stick and fingerstick specimens; reference laboratory programs conserving precious biobank specimens; point-of-care programs processing capillary micro-samples; clinical chemistry programs reducing minimum sample volume requirements for automated analyzers; oncology programs conserving rare biopsy specimen volumes for multiple test panels; and any laboratory application where maximizing analysis from minimum sample volume is a clinical or research 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. \u003ca href=\"#request-sample\"\u003eRequest a free 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 a false bottom tube cap and how does it reduce dead volume?\u003c\/h3\u003e \u003cp\u003eA false bottom tube cap has an internal insert that protrudes into the tube when the cap is screwed on, raising the effective tube floor to a higher position than the actual tube bottom. Auto-analyzers have a fixed aspiration dead volume — the minimum volume that must be in the tube for the probe to aspirate without drawing air. Without a false bottom, this dead volume sits at the bottom of a standard tube and is wasted. With a false bottom cap, the same specimen volume sits higher in the tube, above the false floor, at the probe's accessible aspiration height — allowing the analyzer to access the complete micro-volume specimen without dead-volume loss.\u003c\/p\u003e \u003ch3\u003eIs the false bottom cap compatible with centrifugation for serum separation?\u003c\/h3\u003e \u003cp\u003eYes. The screw cap provides a secure, leak-free closure during centrifugation for serum separation. The HDPE screw-thread engagement maintains cap retention through standard centrifuge speeds used for serum separation (1,000–2,000 × g for 10 minutes). The false bottom insert concentrates the specimen volume at the accessible position after centrifugation. Confirm centrifuge compatibility with your rotor and tube format before use.\u003c\/p\u003e \u003ch3\u003eAre the false bottom caps autoclave-compatible for pre-sterilized supply?\u003c\/h3\u003e \u003cp\u003eYes. HDPE is autoclave-compatible at 121°C \/ 15 psi — unlike LDPE stopper caps which are not autoclave-compatible. This makes the suitable for pre-sterilized supply in neonatal intensive care and pediatric clinical chemistry programs where sterile cap supply is required before micro-volume specimen loading. Autoclave caps in a sealed pouch and allow to cool before use.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"False Bottom Tube Screw Caps, Non-Sterile, High-Density Polyethylene (HDPE), Natural \\u2014 300-3008-020 | 1500\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 300-3008-020. HDPE false bottom screw caps, natural, 1500\/Bag. Micro-volume conservation, dead-volume reduction. BPA-free. USA.\",\n  \"sku\": \"3003008020E1\",\n  \"mpn\": \"300-3008-020\",\n  \"material\": \"High-Density Polyethylene (HDPE)\",\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\": \"124.48\",\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\": \"1500 \/ 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      \"@type\": \"PropertyValue\",\n      \"name\": \"Cap Style\",\n      \"value\": \"Screw cap with false bottom\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Key Feature\",\n      \"value\": \"Dead-volume reduction for micro-volume samples\"\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 a false bottom tube cap and how does it reduce dead volume?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"A false bottom tube cap has an internal insert that protrudes into the tube when the cap is screwed on, raising the effective tube floor to a higher position than the actual tube bottom. Auto-analyzers have a fixed aspiration dead volume \\u2014 the minimum volume that must be in the tube for the probe to aspirate without drawing air. Without a false bottom, this dead volume sits at the bottom of a standard tube and is wasted. With a false bottom cap, the same specimen volume sits higher in the tube, above the false floor, at the probe's accessible aspiration height \\u2014 allowing the analyzer to access the complete micro-volume specimen without dead-volume loss.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the false bottom cap compatible with centrifugation for serum separation?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The 300-3008-020 screw cap provides a secure, leak-free closure during centrifugation for serum separation. The HDPE screw-thread engagement maintains cap retention through standard centrifuge speeds used for serum separation (1,000\\u20132,000 \\u00d7 g for 10 minutes). The false bottom insert concentrates the specimen volume at the accessible position after centrifugation. Confirm centrifuge compatibility with your rotor and tube format before use.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are the false bottom caps autoclave-compatible for pre-sterilized supply?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. HDPE is autoclave-compatible at 121\\u00b0C \/ 15 psi \\u2014 unlike LDPE stopper caps which are not autoclave-compatible. This makes the 300-3008-020 suitable for pre-sterilized supply in neonatal intensive care and pediatric clinical chemistry programs where sterile cap supply is required before micro-volume specimen loading. Autoclave caps in a sealed pouch and allow to cool before use.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48567633412328,"sku":"300-3008-020","price":124.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/300-3008-020_02.jpg?v=1779052385","url":"https:\/\/labsupplies.com\/products\/caplugs-300-3008-020-false-bottom-tube-screw-caps-hdpe-natural","provider":"LabSupplies.com","version":"1.0","type":"link"}