{"product_id":"caplugs-290-8172-01r-8-well-strips-round-bottom-ps-natural","title":"0.37 mL Caps, Round Bottom, PS, Natural — 290-8172-01R | 99\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e8-Well Round Bottom Strips, 0.37 mL Well Volume, PS, Natural — 290-8172-01R | 50 Strips\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 290-8172-01R\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eFormat\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e8-well strip — fits standard 12-position strip frame\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eBottom\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eRound Bottom (U-Bottom)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eWell Volume\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e0.37 mL\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003ePolystyrene (PS)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eNatural (transparent)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eStrip Frame\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eCompatible with 290-8103-Z1N HIPS black strip frame\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePack Size\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e50 strips \/ Bag (400 wells total)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e$325.99 \/ Bag ($0.3260 \/ strip, $40.7482 \/ well)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eTechnical Narrative\u003c\/h2\u003e \u003cp\u003eThe Caplugs® Evergreen is a round-bottom 8-well PS strip — the individual strip unit for partial-plate ELISA, suspension cell culture, and agglutination assays in strip format. Each strip holds 8 wells with 0.37 mL round-bottom (U-bottom) geometry that allows cells and particles to settle by gravity into a uniform central pellet — the same behavior as a full 96-well round-bottom plate, delivered at the 8-well strip scale for modular workflow economics. Strips seat in standard 12-position SBS strip frames (compatible with Caplugs® Evergreen 290-8103-Z1N) to create a full 96-position SBS footprint for automated washer, reader, and robotic handler compatibility.\u003c\/p\u003e \u003cp\u003eThe partial-plate ELISA advantage of strip format is most significant for round-bottom serology and agglutination assays: run only the sample strips required, return unused antibody-coated strips to cold storage, and eliminate the per-plate waste of coating reagents on unused wells. For HAI hemagglutination inhibition assays — where round-bottom well geometry is the WHO standard for RBC button scoring — strip format enables sample-count-matched strip loading without fixed plate format constraints. PS construction provides excellent resistance to standard ELISA buffers, cell culture media, and aqueous assay reagents across the full strip service life.\u003c\/p\u003e \u003cp\u003eAt $325.99 per 50-strip Bag — $0.3260 per strip — the delivers round-bottom 8-well strip capacity at economics suited to strip-per-sample allocation in low-to-moderate throughput assay 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\u003e290817201RE1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eFormat\u003c\/td\u003e \u003ctd\u003e8-well strip\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eBottom\u003c\/td\u003e \u003ctd\u003eRound (U-Bottom)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eWell Volume\u003c\/td\u003e \u003ctd\u003e0.37 mL\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMaterial\u003c\/td\u003e \u003ctd\u003ePolystyrene (PS)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor\u003c\/td\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eStrip Frame\u003c\/td\u003e \u003ctd\u003eCompatible with Caplugs® 290-8103-Z1N HIPS frame\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\u003e50 strips \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eWells\/Bag\u003c\/td\u003e \u003ctd\u003e400 (50 strips × 8 wells)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eApplication\u003c\/td\u003e \u003ctd\u003ePartial-plate ELISA, suspension cell culture, HAI, serial dilution\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\u003eRound Bottom 8-Well Strip Workflow Compatibility — \u003c\/h2\u003e \u003cp\u003eRound-bottom 8-well strips seat in standard 12-position SBS strip frames for partial-plate and strip-format assay workflows:\u003c\/p\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e \u003cth\u003eApplication\u003c\/th\u003e \u003cth\u003eAssay \/ Use\u003c\/th\u003e \u003cth\u003eNotes\u003c\/th\u003e \u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003ePartial-plate ELISA\u003c\/td\u003e \u003ctd\u003eAntibody-coated strip-format ELISA\u003c\/td\u003e \u003ctd\u003eLoad only required strips — return unused to cold storage\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSuspension cell culture\u003c\/td\u003e \u003ctd\u003eLymphocyte, hybridoma, PBMC in strip wells\u003c\/td\u003e \u003ctd\u003eRound bottom allows cells to settle into uniform pellet\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eHAI \/ agglutination assays\u003c\/td\u003e \u003ctd\u003eHemagglutination inhibition, viral titer\u003c\/td\u003e \u003ctd\u003eRound bottom is WHO standard for HAI RBC button scoring\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eImmunoassay (partial plate)\u003c\/td\u003e \u003ctd\u003eAllergen-specific IgE, serology strip assays\u003c\/td\u003e \u003ctd\u003eStandard ELISA strip format for partial-plate serology\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCell-based luminescence strips\u003c\/td\u003e \u003ctd\u003eLuciferase reporter in suspension cells\u003c\/td\u003e \u003ctd\u003eRound bottom for suspension culture with strip-format economics\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSerial dilution (strip format)\u003c\/td\u003e \u003ctd\u003e8-step 2-fold dilution series per strip\u003c\/td\u003e \u003ctd\u003eRound bottom for cell or bead pellet clarity during dilution\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDrug screening (strip format)\u003c\/td\u003e \u003ctd\u003eCompound dose-response in strip wells\u003c\/td\u003e \u003ctd\u003eLow-volume strip screening before committing to full plate\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eBacterial MIC (strip format)\u003c\/td\u003e \u003ctd\u003eMinimum inhibitory concentration in 8-well strip\u003c\/td\u003e \u003ctd\u003eRound bottom shows clear button vs turbidity for MIC scoring\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eConfirm strip-to-frame fit with a sample pair before bulk purchase. Caps sold separately — use standard flat or domed 8-strip caps for sealed storage and PCR applications.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eChemical Resistance — Polystyrene (PS)\u003c\/h2\u003e \u003cp\u003ePS resists aqueous assay reagents. 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\u003eAqueous buffers (PBS, TBS, HEPES)\u003c\/td\u003e \u003ctd\u003e✓ Excellent\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCell culture media\u003c\/td\u003e \u003ctd\u003e✓ Excellent\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\u003eShort-chain alcohols (brief)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eFormalin (4%, brief fixation)\u003c\/td\u003e \u003ctd\u003e✓ Good\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAcetone\u003c\/td\u003e \u003ctd\u003e✗ Avoid\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutoclave (121°C)\u003c\/td\u003e \u003ctd\u003e✗ Not compatible\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eLaboratory Applications\u003c\/h2\u003e \u003cp\u003eThe serves serology and immunology labs running partial-plate HAI and hemagglutination assays; clinical microbiology programs running MIC broth microdilution in strip format; cell biology programs culturing suspension lymphocytes and hybridomas in strip wells; cytokine and multiplex bead assay programs in strip format; drug discovery programs running initial 8-point dose-response screens in strip wells before committing to full plates; and any workflow requiring U-bottom 8-well format in a modular strip configuration.\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, biotech firms, 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 before committing to volume.\u003c\/p\u003e \u003ch2\u003eFrequently Asked Questions — Caplugs® Evergreen \u003c\/h2\u003e \u003ch3\u003eWhat strip frame is compatible with the strips?\u003c\/h3\u003e \u003cp\u003eThe strips are compatible with the Caplugs® Evergreen 290-8103-Z1N black HIPS 12-position strip frame, which converts 12 individual 8-well strips into a full 96-position SBS-footprint format. Standard 12-position strip frames from other manufacturers in SBS-standard inter-strip spacing are also generally compatible. Always validate strip-to-frame fit with a sample pair before large-volume purchase.\u003c\/p\u003e \u003ch3\u003eWhat is the difference between round-bottom  and open-bottom (290-8174-000) strips?\u003c\/h3\u003e \u003cp\u003eRound-bottom strips  have U-shaped well floors — liquid and cells are contained in each well, making them suitable for ELISA, cell culture, and agglutination assays. Open-bottom strips (290-8174-000) have no well floors — the bottom of each well is open, enabling membrane filter attachment, electrode contact, or custom surface integration from below. Choose round-bottom for standard containment assays; open-bottom for membrane, electrode, or biosensor applications.\u003c\/p\u003e \u003ch3\u003eAre the strips BPA-free?\u003c\/h3\u003e \u003cp\u003eYes. Molded from virgin Polystyrene (PS) containing no BPA and no phthalate plasticizers.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"8-Well Strips, Round Bottom, 0.37 mL Well Volume, Non-Sterile, Polystyrene (PS), Natural \\u2014 290-8172-01R | 50 Strips\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 290-8172-01R. 8-well round-bottom PS strips, 0.37 mL, natural, 50\/Bag. ELISA, suspension culture. BPA-free. USA.\",\n  \"sku\": \"290817201RE1\",\n  \"mpn\": \"290-8172-01R\",\n  \"material\": \"Polystyrene (PS)\",\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\": \"325.99\",\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      \"@type\": \"PropertyValue\",\n      \"name\": \"Well Volume\",\n      \"value\": \"0.37 mL\"\n    },\n    {\n      \"@type\": \"PropertyValue\",\n      \"name\": \"Bottom Geometry\",\n      \"value\": \"Round\"\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 strip frame is compatible with the 290-8172-01R strips?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The 290-8172-01R strips are compatible with the Caplugs\\u00ae Evergreen 290-8103-Z1N black HIPS 12-position strip frame, which converts 12 individual 8-well strips into a full 96-position SBS-footprint format. Standard 12-position strip frames from other manufacturers in SBS-standard inter-strip spacing are also generally compatible. Always validate strip-to-frame fit with a sample pair before large-volume purchase.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the difference between round-bottom (290-8172-01R) and open-bottom (290-8174-000) strips?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Round-bottom strips (290-8172-01R) have U-shaped well floors \\u2014 liquid and cells are contained in each well, making them suitable for ELISA, cell culture, and agglutination assays. Open-bottom strips (290-8174-000) have no well floors \\u2014 the bottom of each well is open, enabling membrane filter attachment, electrode contact, or custom surface integration from below. Choose round-bottom for standard containment assays; open-bottom for membrane, electrode, or biosensor applications.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are the 290-8172-01R strips BPA-free?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. Molded from virgin Polystyrene (PS) containing no BPA and no phthalate plasticizers.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48565296169192,"sku":"290-8172-01R","price":325.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/silo-large.jpg?v=1778982986","url":"https:\/\/labsupplies.com\/products\/caplugs-290-8172-01r-8-well-strips-round-bottom-ps-natural","provider":"LabSupplies.com","version":"1.0","type":"link"}