{"product_id":"caplugs-258-4045-030-embedding-cassettes-pp-natural-stainless-steel-cover","title":"Embedding Cassettes, PP, Natural, Thermo Fisher® Compatible — 258-4045-030 | 500\/Bag | Caplugs® Evergreen","description":"\u003ch2\u003eEmbedding Cassettes with Stainless Steel Covers, Polypropylene (PP), Natural — 500\/Bag Unassembled\u003c\/h2\u003e \u003ctable\u003e \u003cthead\u003e\u003ctr\u003e\u003cth colspan=\"2\"\u003eQuick Reference — 258-4045-030\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003ePolypropylene (PP) body\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eCover\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eStainless Steel\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\u003eParaffin Compat.\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e✓ Compatible (56–65°C)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eXylene Compat.\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e✓ Compatible\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eFormalin Compat.\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e✓ Compatible\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003eAssembly\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003eUnassembled — 500 cassettes + 500 steel covers per Bag\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\u003e500 \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e \u003ctd\u003e$45.19 \/ Bag ($0.0904 \/ cassette + cover)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003ch2\u003eTechnical Narrative\u003c\/h2\u003e \u003cp\u003eThe Caplugs® Evergreen 258-4045-030 is a Polypropylene (PP) tissue embedding cassette with a stainless steel cover — the preferred configuration for high-throughput surgical pathology laboratories where plastic cover float-out, warping, or loss in automated tissue processor baskets is a recurring workflow disruption. The stainless steel cover provides the mass, rigidity, and mechanical engagement required to remain positively locked on the PP cassette base throughout automated tissue processor agitation cycles, preventing the cover-detachment events that interrupt processing runs, contaminate processor baths, and compromise specimen integrity. Supplied unassembled 500\/Bag for pre-labeling flexibility.\u003c\/p\u003e \u003cp\u003eThe PP cassette body withstands the full histology processing chemical sequence — 10% NBF formalin fixation, graded ethanol dehydration, xylene or xylene substitute clearing, and paraffin wax infiltration at 56–65°C — without warping, cracking, or dimensional change that would compromise embedding orientation or block face geometry. The natural PP body accepts pencil, ballpoint pen, and laser engraving for specimen identification directly on the cassette body, reducing the label loss risk associated with adhesive label cassette identification during processor agitation.\u003c\/p\u003e \u003cp\u003eAt $45.19 per 500\/Bag — $0.0904 per cassette-and-cover pair — the delivers stainless steel cover security at a per-unit cost competitive with standard plastic-cover cassettes for high-volume surgical pathology programs where cover integrity directly impacts processing throughput and specimen safety.\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\u003e2584045030E1\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCassette Material\u003c\/td\u003e \u003ctd\u003ePolypropylene (PP)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eCover Material\u003c\/td\u003e \u003ctd\u003eStainless Steel\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eColor\u003c\/td\u003e \u003ctd\u003eNatural\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eHole Pattern\u003c\/td\u003e \u003ctd\u003eStandard histology cassette mesh pattern\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAssembly State\u003c\/td\u003e \u003ctd\u003eUnassembled — 500 PP cassettes + 500 steel covers per Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eFormalin Compat.\u003c\/td\u003e \u003ctd\u003e✓ Compatible (10% NBF)\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eXylene Compat.\u003c\/td\u003e \u003ctd\u003e✓ Compatible\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eParaffin Compat.\u003c\/td\u003e \u003ctd\u003e✓ Compatible (56–65°C infiltration)\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\u003e500 \/ Bag\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eApplication\u003c\/td\u003e \u003ctd\u003eTissue processing, paraffin embedding, surgical pathology\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\u003eTissue Processing \u0026amp; Embedding Workflow Compatibility — \u003c\/h2\u003e \u003cp\u003eThe PP cassette with stainless steel cover is compatible with standard histology tissue processing and embedding 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\u003eSurgical biopsy processing\u003c\/td\u003e \u003ctd\u003eProstate, breast, colon, skin biopsy\u003c\/td\u003e \u003ctd\u003eSteel cover withstands tissue processor basket agitation without warping\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eLarge specimen embedding\u003c\/td\u003e \u003ctd\u003eExcisional biopsy, lymph node, resection\u003c\/td\u003e \u003ctd\u003ePP cassette compatible with all standard tissue processors\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAutomated tissue processing\u003c\/td\u003e \u003ctd\u003eLeica ASP300S, Thermo Excelsior, Sakura Tissue-Tek\u003c\/td\u003e \u003ctd\u003eSteel cover locks securely in cassette basket at all agitation speeds\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eRoutine surgical pathology\u003c\/td\u003e \u003ctd\u003eAny formalin-fixed tissue specimen\u003c\/td\u003e \u003ctd\u003eNatural PP body accepts pencil, pen, and laser engraving for ID\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eResearch histology\u003c\/td\u003e \u003ctd\u003eAnimal tissue, experimental specimen processing\u003c\/td\u003e \u003ctd\u003eSteel cover eliminates float-out risk during xylene clearing steps\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eDecalcification processing\u003c\/td\u003e \u003ctd\u003eBone biopsy, calcified tissue\u003c\/td\u003e \u003ctd\u003ePP and steel resist decal reagents (formic acid, EDTA, HCl)\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eStainless steel covers lock onto PP cassette bases with positive engagement. Confirm cover-to-base fit on your specific processor basket configuration with a sample set before bulk purchase.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eChemical \u0026amp; Processing Compatibility — Polypropylene (PP)\u003c\/h2\u003e \u003cp\u003ePP body with stainless steel cover provides full histology processing solvent compatibility — paraffin wax, xylene, ethanol series, formalin, and most decalcification reagents.\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\u003eFormalin (10% NBF)\u003c\/td\u003e \u003ctd\u003e✓ Compatible — primary fixative\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eXylene \/ xylene substitutes\u003c\/td\u003e \u003ctd\u003e✓ Compatible — clearing agent\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eEthanol (all concentrations)\u003c\/td\u003e \u003ctd\u003e✓ Compatible — dehydration series\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eIsopropanol (IPA)\u003c\/td\u003e \u003ctd\u003e✓ Compatible\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eParaffin wax (56–65°C)\u003c\/td\u003e \u003ctd\u003e✓ Compatible — infiltration temperature\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eFormic acid (decalcification)\u003c\/td\u003e \u003ctd\u003e✓ Compatible — 10–20% formic acid\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eEDTA (decalcification)\u003c\/td\u003e \u003ctd\u003e✓ Compatible\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eHematoxylin \/ eosin\u003c\/td\u003e \u003ctd\u003e✓ Compatible — contact-free during staining\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAcetone\u003c\/td\u003e \u003ctd\u003e✓ Good — brief incidental contact\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003cp\u003e\u003cem\u003eNot autoclave-compatible for cassette sterilization — histology cassettes are used with formalin-fixed non-sterile tissue and do not require sterilization before use.\u003c\/em\u003e\u003c\/p\u003e \u003ch2\u003eAnatomic Pathology Laboratory Applications\u003c\/h2\u003e \u003cp\u003eThe embedding cassette with steel cover serves high-volume hospital and reference anatomic pathology laboratories processing surgical biopsy, excisional, and resection specimens through automated tissue processors; gastrointestinal and endoscopy pathology programs with high-throughput mucosal biopsy processing; prostate and genitourinary pathology programs; academic medical center surgical pathology cores; and any pathology setting where plastic cover float-out or loss in tissue processor baskets is a documented workflow problem.\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 hospital systems, reference laboratories, 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 compatibility sample below\u003c\/a\u003e to validate fit with your processor configuration before committing to volume.\u003c\/p\u003e \u003ch2\u003eFrequently Asked Questions — Caplugs® Evergreen \u003c\/h2\u003e \u003ch3\u003eWhy use a stainless steel cover instead of a standard plastic cover?\u003c\/h3\u003e \u003cp\u003eStainless steel covers provide mechanical engagement with the PP cassette base that prevents the float-out and cover-loss events common with lighter plastic covers during automated tissue processor agitation, particularly in rapid-cycle processors running aggressive solvent agitation sequences. Lost plastic covers contaminate processor baths, interrupt processing runs, and require time-consuming bath cleaning. The steel cover eliminates this failure mode while remaining fully compatible with the histology processing solvent sequence.\u003c\/p\u003e \u003ch3\u003eIs the compatible with all automated tissue processors?\u003c\/h3\u003e \u003cp\u003eThe PP cassette body is compatible with all standard automated tissue processors including Leica ASP300S\/ASP6025, Thermo Fisher Excelsior ES\/AS, and Sakura Tissue-Tek VIP 6. Confirm that the steel cover height clearance fits your specific processor basket and retainer bar configuration before large-volume purchase — cassette basket retainer bar heights vary between processor models and can limit cover height compatibility.\u003c\/p\u003e \u003ch3\u003eAre the cassettes BPA-free?\u003c\/h3\u003e \u003cp\u003eYes. The PP cassette body is molded from virgin Polypropylene containing no BPA and no phthalate plasticizers. The stainless steel cover is inert and contains no polymer additives.\u003c\/p\u003e \u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Embedding Cassettes with Stainless Steel Covers, Non-Sterile, Polypropylene (PP), Natural \\u2014 258-4045-030 | 500\/Bag Unassembled | Caplugs\\u00ae Evergreen\",\n  \"description\": \"Caplugs\\u00ae Evergreen 258-4045-030. PP embedding cassettes with stainless steel covers, 500\/Bag unassembled. Xylene \u0026 paraffin compatible. BPA-free. USA.\",\n  \"sku\": \"2584045030E1\",\n  \"mpn\": \"258-4045-030\",\n  \"material\": \"Polypropylene (PP)\",\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\": \"45.19\",\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\": \"500 \/ 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\": \"Paraffin Compatible\",\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\": \"Why use a stainless steel cover instead of a standard plastic cover?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Stainless steel covers provide mechanical engagement with the PP cassette base that prevents the float-out and cover-loss events common with lighter plastic covers during automated tissue processor agitation, particularly in rapid-cycle processors running aggressive solvent agitation sequences. Lost plastic covers contaminate processor baths, interrupt processing runs, and require time-consuming bath cleaning. The steel cover eliminates this failure mode while remaining fully compatible with the histology processing solvent sequence.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the 258-4045-030 compatible with all automated tissue processors?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The PP cassette body is compatible with all standard automated tissue processors including Leica ASP300S\/ASP6025, Thermo Fisher Excelsior ES\/AS, and Sakura Tissue-Tek VIP 6. Confirm that the steel cover height clearance fits your specific processor basket and retainer bar configuration before large-volume purchase \\u2014 cassette basket retainer bar heights vary between processor models and can limit cover height compatibility.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Are the 258-4045-030 cassettes BPA-free?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The PP cassette body is molded from virgin Polypropylene containing no BPA and no phthalate plasticizers. The stainless steel cover is inert and contains no polymer additives.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e","brand":"Caplugs® Evergreen","offers":[{"title":"Default Title","offer_id":48564502986984,"sku":"258-4045-030","price":45.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0694\/5361\/1240\/files\/Embedding_20Cassettes_1.png?v=1778941236","url":"https:\/\/labsupplies.com\/products\/caplugs-258-4045-030-embedding-cassettes-pp-natural-stainless-steel-cover","provider":"LabSupplies.com","version":"1.0","type":"link"}