{"product_id":"caplugs-290-8174-000-8-well-strips-open-bottom-ps-natural","title":"Plates, PET, Natural — 290-8174-000 | 72\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003e8-Well Open Bottom Strips, PS, Natural — 290-8174-000 | 100 Strips\/Bag\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 290-8174-000\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\u003eOpen (no well floor — bottom of wells is open)\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\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePrimary Use\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eMembrane filter, electrode contact, custom surface assays\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\u003e100 strips \/ Bag (800 open-well positions total)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e$203.72 \/ Bag ($0.2038 \/ strip)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eTechnical Narrative\u003c\/h2\u003e \u003cp\u003eThe Caplugs® Evergreen is an open-bottom 8-well PS strip — the strip-format platform for applications requiring physical, optical, or electrical access to the bottom of each well position in a modular 8-well format. Each strip has no well floors, enabling direct contact between well contents and membrane filters (for migration\/invasion assays), electrode arrays (for MSD electrochemiluminescence), sensor chip surfaces (for SPR detection), or custom functionalized surfaces bonded to the strip underside. Seats in standard 12-position SBS strip frames (compatible with Caplugs® Evergreen 290-8103-Z1N) for full automation compatibility.\u003c\/p\u003e \u003cp\u003eThe open-bottom strip delivers the same functional capabilities as the open-bottom 96-well plate (290-8121-010) in a modular 8-well format — enabling strip-count-matched experimental allocation rather than full 96-well plate commitment for assay development and low-sample-count protocols. 100 strips per Bag at $0.2038 per strip provides the per-unit economics for strip-per-condition allocation in assay optimization workflows before scaling to full plates.\u003c\/p\u003e \u003cp\u003eAt $203.72 per 100-strip Bag — $0.2038 per strip — the provides open-bottom strip access at bulk economics for high-throughput membrane and electrode 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\u003e2908174000E1\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\u003eOpen — no well floor; each well open at base\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\u003e100 strips \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eWells\/Bag\u003c\/td\u003e \u003ctd\u003e800 (100 strips × 8 wells)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eApplication\u003c\/td\u003e \u003ctd\u003eMembrane insert, SPR, electrode, custom surface — strip format\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\u003eOpen Bottom Strip Application Compatibility — \u003c\/h2\u003e \u003cp\u003eThe open-bottom 8-well strip provides strip-scale access to open-well-bottom applications requiring physical, optical, or electrical access from below:\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\u003eMembrane filter strip assays\u003c\/td\u003e \u003ctd\u003eCell migration in strip Boyden chamber format\u003c\/td\u003e \u003ctd\u003eOpen bottom accepts membrane filter for migration\/invasion assay\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eElectrode contact (strip)\u003c\/td\u003e \u003ctd\u003eStrip-format MSD electrochemiluminescence\u003c\/td\u003e \u003ctd\u003eOpen bottom required for electrode contact in MSD strip format\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCustom surface strip assay\u003c\/td\u003e \u003ctd\u003eFunctionalized surface attachment from below\u003c\/td\u003e \u003ctd\u003eOpen bottom enables custom surface chemistry in strip format\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eTIRF imaging (strip format)\u003c\/td\u003e \u003ctd\u003eTotal internal reflection imaging in strip wells\u003c\/td\u003e \u003ctd\u003eOpen bottom allows objective contact for TIRF strip assay\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMicrofluidic strip integration\u003c\/td\u003e \u003ctd\u003eMicrofluidic channel access from strip bottom\u003c\/td\u003e \u003ctd\u003eOpen strip bottom enables microfluidic coupling at strip scale\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eStrip filter plate\u003c\/td\u003e \u003ctd\u003eWash-based assay with bottom drainage\u003c\/td\u003e \u003ctd\u003eOpen bottom with membrane filter enables vacuum aspiration\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003ePatch clamp (strip format)\u003c\/td\u003e \u003ctd\u003eIon channel assay in 8-well strip\u003c\/td\u003e \u003ctd\u003eOpen bottom allows electrode access in strip-format patch clamp\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSensor chip strip assay\u003c\/td\u003e \u003ctd\u003eSPR or biosensor chip contact in strip format\u003c\/td\u003e \u003ctd\u003eOpen bottom for direct sensor chip contact per strip position\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eOpen-bottom strips have no well containment without a membrane, filter, or bonded surface. Always pair with an appropriate bottom layer before loading liquid. Compatible with the 290-8103-Z1N strip frame for SBS-footprint integration.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eChemical Resistance — Polystyrene (PS)\u003c\/h2\u003e \u003cp\u003ePS frame resists aqueous assay reagents for surface functionalization and electrode-contact 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 (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 cell biology programs running strip-format Boyden chamber cell migration and invasion assays; biosensor programs developing strip-format SPR and electrochemical detection; MSD Meso Scale strip-format electrochemiluminescence assay programs; custom surface functionalization programs in strip format; TIRF and advanced fluorescence imaging in strip wells; and any workflow requiring open-bottom 8-well strip format within a standard SBS strip frame footprint.\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 is the difference between open-bottom strips  and round-bottom strips (290-8172-01R)?\u003c\/h3\u003e \u003cp\u003eRound-bottom strips (290-8172-01R) have U-shaped well floors for liquid containment — suitable for ELISA, cell culture, and agglutination assays. Open-bottom strips  have no well floors — the bottom of each position is completely open, enabling membrane filter attachment, electrode contact, sensor chip access, or custom surface integration from below. Open-bottom strips cannot contain liquid without a membrane or surface bonded at the base.\u003c\/p\u003e \u003ch3\u003eHow do I use open-bottom strips with a membrane filter?\u003c\/h3\u003e \u003cp\u003eBond or press-fit a porous membrane (PET, polycarbonate, nylon, PTFE) to the open underside of the strip before loading liquid. For Boyden chamber migration assays, apply a membrane with the appropriate pore size (typically 8 µm for cell migration, 3 µm for invasion) to the strip base, add chemoattractant to the well, and seed cells on the membrane surface. Vacuum filtration variants use PTFE or nylon membranes for wash-through applications. Confirm membrane-to-strip compatibility with a sample set before bulk purchase.\u003c\/p\u003e \u003ch3\u003eAre the open-bottom 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, Open Bottom, Non-Sterile, Polystyrene (PS), Natural \\u2014 290-8174-000 | 100 Strips\/Bag | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 290-8174-000. 8-well open-bottom PS strips, natural, 100\/Bag. Membrane, electrode, custom surface assays. BPA-free. USA.\",\n  \"sku\": \"2908174000E1\",\n  \"mpn\": \"290-8174-000\",\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\": \"203.72\",\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\": \"Bottom Geometry\",\n      \"value\": \"Open\"\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 open-bottom strips (290-8174-000) and round-bottom strips (290-8172-01R)?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Round-bottom strips (290-8172-01R) have U-shaped well floors for liquid containment \\u2014 suitable for ELISA, cell culture, and agglutination assays. Open-bottom strips (290-8174-000) have no well floors \\u2014 the bottom of each position is completely open, enabling membrane filter attachment, electrode contact, sensor chip access, or custom surface integration from below. Open-bottom strips cannot contain liquid without a membrane or surface bonded at the base.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How do I use open-bottom strips with a membrane filter?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Bond or press-fit a porous membrane (PET, polycarbonate, nylon, PTFE) to the open underside of the strip before loading liquid. For Boyden chamber migration assays, apply a membrane with the appropriate pore size (typically 8 \\u00b5m for cell migration, 3 \\u00b5m for invasion) to the strip base, add chemoattractant to the well, and seed cells on the membrane surface. Vacuum filtration variants use PTFE or nylon membranes for wash-through applications. Confirm membrane-to-strip compatibility with a sample set before bulk purchase.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are the 290-8174-000 open-bottom 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":48565296201960,"sku":"290-8174-000","price":203.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/silo-large_d8c72d40-a704-4769-b6a5-fc3758948ea1.jpg?v=1778982988","url":"https:\/\/labsupplies.com\/products\/caplugs-290-8174-000-8-well-strips-open-bottom-ps-natural","provider":"LabSupplies.com","version":"1.0","type":"link"}