{"product_id":"zdp189-bunka-210mm-powder-steel","title":"Bunka Knife — ZDP189 Powder Metallurgy Core | Ultra-High Edge Retention","description":"\u003cp data-start=\"113\" data-end=\"262\"\u003eEngineered for maximum edge longevity under controlled use, prioritising wear resistance and cutting precision over versatility and impact tolerance.\u003c\/p\u003e\n\u003cp data-start=\"291\" data-end=\"549\"\u003eIn fine preparation work, the knife maintains a sharp, stable edge across extended sessions without noticeable degradation. It moves through ingredients with minimal resistance, allowing precise, repeatable cuts without frequent interruption for maintenance.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1a9y8wg\" data-start=\"556\" data-end=\"582\"\u003eFunctional Behaviour\u003c\/h3\u003e\n\u003cp data-start=\"583\" data-end=\"781\"\u003eThe cutting behaviour is highly efficient and precise. The edge engages cleanly with very low resistance, maintaining its geometry through repeated slicing and push cutting with minimal deformation.\u003c\/p\u003e\n\u003cp data-start=\"783\" data-end=\"946\"\u003eThis performance comes from the extreme hardness and carbide density of the core steel, which resists wear far more effectively than conventional stainless alloys.\u003c\/p\u003e\n\u003cp data-start=\"948\" data-end=\"1114\"\u003eTrade-off: the edge is sensitive to lateral stress and impact. Improper technique or contact with hard materials can result in microchipping rather than gradual wear.\u003c\/p\u003e\n\u003cp data-start=\"1116\" data-end=\"1280\"\u003eOver time, edge degradation is slow but irreversible through honing. Sharpening intervals are extended, but require high-quality abrasives and controlled technique.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1i9rskd\" data-start=\"1287\" data-end=\"1311\"\u003eBlade Architecture\u003c\/h3\u003e\n\u003cp data-start=\"1312\" data-end=\"1513\"\u003eThe thin ~2.0 mm spine combined with a fine edge geometry creates low cutting resistance and high precision. The Bunka profile supports detailed work, particularly in push cutting and tip-driven tasks.\u003c\/p\u003e\n\u003cp data-start=\"1515\" data-end=\"1653\"\u003eThe san-mai construction provides structural buffering through softer outer layers, while cutting performance remains defined by the core.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1b1m7ik\" data-start=\"1660\" data-end=\"1691\"\u003eEngineering and Materials\u003c\/h3\u003e\n\u003cp data-start=\"1692\" data-end=\"1772\"\u003eThe core steel, \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eZDP189 steel\u003c\/span\u003e\u003c\/span\u003e, is hardened to 65–67 HRC.\u003c\/p\u003e\n\u003cp data-start=\"1774\" data-end=\"1790\"\u003eThis results in:\u003c\/p\u003e\n\u003cul data-start=\"1791\" data-end=\"1917\"\u003e\n\u003cli data-section-id=\"4sl0n9\" data-start=\"1791\" data-end=\"1821\"\u003eExceptional edge retention\u003c\/li\u003e\n\u003cli data-section-id=\"1espjhe\" data-start=\"1822\" data-end=\"1867\"\u003eHigh wear resistance under continuous use\u003c\/li\u003e\n\u003cli data-section-id=\"1l9wirb\" data-start=\"1868\" data-end=\"1917\"\u003eStable edge geometry with minimal deformation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1919\" data-end=\"2044\"\u003eThe powder metallurgy process produces a high volume of fine chromium carbides, significantly increasing abrasion resistance.\u003c\/p\u003e\n\u003cp data-start=\"2046\" data-end=\"2231\"\u003eCompared to conventional stainless steels, it dramatically extends edge life. Compared to lower hardness PM steels, it sacrifices toughness and ease of sharpening for maximum retention.\u003c\/p\u003e\n\u003ch3 data-section-id=\"h9t8r9\" data-start=\"2238\" data-end=\"2262\"\u003eHandle Engineering\u003c\/h3\u003e\n\u003cp data-start=\"2263\" data-end=\"2511\"\u003eThe octagonal handle combines high-density resin with internal phosphor bronze reinforcement, providing structural stability and resistance to environmental variation. The geometry supports controlled grip indexing, essential for precision cutting.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1t970nh\" data-start=\"2518\" data-end=\"2545\"\u003eManufacturing Process\u003c\/h3\u003e\n\u003cp data-start=\"2546\" data-end=\"2819\"\u003eThe blade is produced through powder metallurgy steel processing followed by san-mai lamination. Vacuum heat treatment and cryogenic stabilisation achieve the target hardness. Precision grinding defines the thin geometry, while surface etching reveals the layered cladding.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1bbj3vu\" data-start=\"2826\" data-end=\"2846\"\u003eFunctional Use\u003c\/h3\u003e\n\u003cp data-start=\"2848\" data-end=\"2867\"\u003e\u003cstrong data-start=\"2848\" data-end=\"2865\"\u003eDesigned for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"2868\" data-end=\"2977\"\u003e\n\u003cli data-section-id=\"b2feqi\" data-start=\"2868\" data-end=\"2898\"\u003eFine vegetable preparation\u003c\/li\u003e\n\u003cli data-section-id=\"1dzhpah\" data-start=\"2899\" data-end=\"2915\"\u003eFish slicing\u003c\/li\u003e\n\u003cli data-section-id=\"gxdi5\" data-start=\"2916\" data-end=\"2941\"\u003eBoneless protein work\u003c\/li\u003e\n\u003cli data-section-id=\"1sb85iw\" data-start=\"2942\" data-end=\"2977\"\u003ePrecision push and pull cutting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2979\" data-end=\"3002\"\u003e\u003cstrong data-start=\"2979\" data-end=\"3000\"\u003eNot designed for:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3003\" data-end=\"3074\"\u003e\n\u003cli data-section-id=\"s8qp3i\" data-start=\"3003\" data-end=\"3019\"\u003eBone contact\u003c\/li\u003e\n\u003cli data-section-id=\"axa54w\" data-start=\"3020\" data-end=\"3035\"\u003eFrozen food\u003c\/li\u003e\n\u003cli data-section-id=\"qt5qgp\" data-start=\"3036\" data-end=\"3055\"\u003eLateral torsion\u003c\/li\u003e\n\u003cli data-section-id=\"o064u4\" data-start=\"3056\" data-end=\"3074\"\u003eImpact cutting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eKnife Type\u003c\/td\u003e\n\u003ctd\u003eBunka\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlade Length\u003c\/td\u003e\n\u003ctd\u003e210 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCore Steel\u003c\/td\u003e\n\u003ctd\u003eZDP189 (Powder Metallurgy)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardness\u003c\/td\u003e\n\u003ctd\u003e65–67 HRC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eSan-mai laminated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCladding\u003c\/td\u003e\n\u003ctd\u003e48-layer SUS420J2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBlade Thickness\u003c\/td\u003e\n\u003ctd\u003e2.0 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEdge Angle\u003c\/td\u003e\n\u003ctd\u003e15° per side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHandle Material\u003c\/td\u003e\n\u003ctd\u003eHigh-density resin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReinforcement\u003c\/td\u003e\n\u003ctd\u003ePhosphor bronze core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFerrule\u003c\/td\u003e\n\u003ctd\u003eWhite brass\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e181 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrientation\u003c\/td\u003e\n\u003ctd\u003eAmbidextrous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackaging\u003c\/td\u003e\n\u003ctd\u003eWooden presentation box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eCertification\u003c\/th\u003e\n\u003cth\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003ctd\u003eConforms to EU safety requirements\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLFGB\u003c\/td\u003e\n\u003ctd\u003eApproved for food contact\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"FireForge Knives","offers":[{"title":"Default Title","offer_id":52946281464137,"sku":null,"price":649.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0968\/2980\/0777\/files\/Max_1200_X_1200_-_2025-11-08T110100.005.jpg?v=1762610517","url":"https:\/\/fireforgeknives.com\/products\/zdp189-bunka-210mm-powder-steel","provider":"FireForge Knives ","version":"1.0","type":"link"}