{"product_id":"metal-doc-198mm","title":"Metal DOC 198mm","description":"\u003cstyle\u003e\n  .cat-faq-module {\n    max-width: 100%;\n    margin: 30px 0;\n    font-family: 'Segoe UI', Roboto, Arial, sans-serif;\n    background: #ffffff;\n    border-radius: 28px;\n    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);\n    border: 1px solid #edf2f7;\n    padding: 30px 32px 10px 32px;\n    box-sizing: border-box;\n  }\n  .cat-faq-module .module-header {\n    display: flex;\n    align-items: center;\n    gap: 14px;\n    padding-bottom: 18px;\n    border-bottom: 3px solid #f0f4fa;\n    margin-bottom: 20px;\n  }\n  .cat-faq-module .module-header h2 {\n    font-size: 28px;\n    font-weight: 700;\n    color: #0b1a33;\n    margin: 0;\n    letter-spacing: -0.3px;\n  }\n  .cat-faq-module .module-header .badge {\n    background: #0b1a33;\n    color: #fff;\n    font-size: 14px;\n    font-weight: 600;\n    padding: 2px 18px;\n    border-radius: 30px;\n    letter-spacing: 0.3px;\n  }\n  .cat-faq-module details {\n    display: block;\n    margin-bottom: 6px;\n    border-bottom: 1px solid #eef2f6;\n    padding: 8px 0;\n    transition: all 0.2s ease;\n  }\n  .cat-faq-module details:last-of-type {\n    border-bottom: none;\n  }\n  .cat-faq-module summary {\n    display: flex;\n    align-items: center;\n    cursor: pointer;\n    font-size: 17px;\n    font-weight: 600;\n    color: #0b1a33;\n    padding: 10px 4px 10px 0;\n    list-style: none;\n    position: relative;\n    user-select: none;\n    gap: 12px;\n  }\n  .cat-faq-module summary::-webkit-details-marker {\n    display: none;\n  }\n  .cat-faq-module summary::before {\n    content: \"▶\";\n    font-size: 14px;\n    color: #1a73e8;\n    transition: transform 0.25s ease;\n    display: inline-block;\n    width: 20px;\n    font-weight: 400;\n  }\n  .cat-faq-module details[open] \u003e summary::before {\n    transform: rotate(90deg);\n  }\n  .cat-faq-module summary .q-mark {\n    background: #eef5ff;\n    color: #1a73e8;\n    font-weight: 700;\n    font-size: 14px;\n    padding: 0 12px;\n    border-radius: 20px;\n    line-height: 26px;\n  }\n  .cat-faq-module .answer-wrap {\n    padding: 8px 20px 16px 36px;\n    color: #2c3e50;\n    font-size: 15.5px;\n    line-height: 1.75;\n  }\n  .cat-faq-module .answer-wrap p {\n    margin: 0 0 12px 0;\n  }\n  .cat-faq-module .answer-wrap p:last-child {\n    margin-bottom: 0;\n  }\n  .cat-faq-module .answer-wrap ul, \n  .cat-faq-module .answer-wrap ol {\n    padding-left: 22px;\n    margin: 6px 0 12px 0;\n  }\n  .cat-faq-module .answer-wrap li {\n    margin-bottom: 4px;\n  }\n  .cat-faq-module .answer-wrap strong {\n    color: #0b1a33;\n  }\n  .cat-faq-module .warning-box {\n    background: #f9fcff;\n    border-left: 5px solid #1a73e8;\n    padding: 14px 22px;\n    border-radius: 12px;\n    margin: 12px 0 4px 0;\n    font-size: 15px;\n  }\n  .cat-faq-module table {\n    width: 100%;\n    border-collapse: collapse;\n    font-size: 14.5px;\n    margin: 12px 0;\n  }\n  .cat-faq-module table th,\n  .cat-faq-module table td {\n    border: 1px solid #dce1e9;\n    padding: 10px 8px;\n    text-align: left;\n  }\n  .cat-faq-module table th {\n    background: #f0f4fa;\n  }\n  .cat-faq-module .contact-item {\n    margin-bottom: 10px;\n    padding-left: 4px;\n  }\n  .cat-faq-module .contact-item strong {\n    display: inline-block;\n    min-width: 60px;\n  }\n  @media (max-width: 640px) {\n    .cat-faq-module { padding: 18px 16px 6px 16px; }\n    .cat-faq-module .module-header h2 { font-size: 22px; }\n    .cat-faq-module summary { font-size: 15px; }\n    .cat-faq-module .answer-wrap { padding: 6px 8px 12px 20px; font-size: 14.5px; }\n    .cat-faq-module table { font-size: 13px; }\n    .cat-faq-module table th, .cat-faq-module table td { padding: 6px 4px; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"cat-faq-module\"\u003e\n  \u003cdiv class=\"module-header\"\u003e\n    \u003ch2\u003e Product Description \u003c\/h2\u003e\n    \u003cspan class=\"badge\"\u003eClick to expand\u003c\/span\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- Q1 – 什么是柴油车金属DOC催化剂？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ1\u003c\/span\u003e What is a diesel metal DOC catalyst?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eA \u003cstrong\u003emetal DOC (Diesel Oxidation Catalyst)\u003c\/strong\u003e uses a \u003cstrong\u003emetal honeycomb substrate\u003c\/strong\u003e (typically FeCrAl alloy) instead of ceramic as the catalyst carrier. Like ceramic DOC, it is installed in the diesel exhaust system to oxidize harmful gaseous pollutants, but the metal substrate offers distinct advantages.\u003c\/p\u003e\n\n      \u003cp\u003e\u003cstrong\u003eCore Function (same as ceramic DOC):\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eConverts \u003cstrong\u003eCarbon Monoxide (CO)\u003c\/strong\u003e into CO₂.\u003c\/li\u003e\n        \u003cli\u003eConverts \u003cstrong\u003eUnburned Hydrocarbons (HC)\u003c\/strong\u003e into CO₂ and H₂O.\u003c\/li\u003e\n        \u003cli\u003eOxidizes \u003cstrong\u003eNO\u003c\/strong\u003e to NO₂ to enable passive DPF regeneration.\u003c\/li\u003e\n        \u003cli\u003eReduces diesel exhaust odour.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eWhy metal substrate?\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eUltra-thin walls\u003c\/strong\u003e (as low as 0.03 mm) allow higher cell densities (up to 1200 CPSI) with lower backpressure.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHigh thermal conductivity\u003c\/strong\u003e enables faster light‑off (reaches operating temperature 30–45 seconds faster than ceramic).\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eSuperior thermal shock resistance\u003c\/strong\u003e – metal substrates are highly ductile and resist cracking under extreme temperature fluctuations.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMechanical strength\u003c\/strong\u003e – more resistant to vibration and impact, ideal for off‑road and heavy‑duty applications.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eLightweight\u003c\/strong\u003e – metal substrates are typically 40–50% lighter than equivalent ceramic substrates.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eShape flexibility\u003c\/strong\u003e – can be manufactured in nearly any shape (oval, racetrack, trapezoidal, etc.) to fit tight packaging.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003eMetal DOC catalysts are increasingly used in high‑performance, heavy‑duty, and off‑highway diesel applications where durability and fast warm‑up are critical.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q2 – 柴油车DOC的工作原理？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ2\u003c\/span\u003e Working principle of diesel DOC\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eThe DOC works on the principle of \u003cstrong\u003ecatalytic oxidation\u003c\/strong\u003e. The honeycomb substrate is coated with a \"washcoat\" containing precious metal catalysts — typically \u003cstrong\u003ePlatinum (Pt)\u003c\/strong\u003e and \u003cstrong\u003ePalladium (Pd)\u003c\/strong\u003e — which promote chemical reactions without being consumed themselves.\u003c\/p\u003e\n\n      \u003cp\u003e\u003cstrong\u003eChemical Reactions:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCO + ½ O₂ → CO₂\u003c\/strong\u003e (Carbon Monoxide to Carbon Dioxide)\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHC + O₂ → CO₂ + H₂O\u003c\/strong\u003e (Hydrocarbons to CO₂ and Water)\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eNO + ½ O₂ → NO₂\u003c\/strong\u003e (Nitric Oxide to Nitrogen Dioxide)\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eOperating Conditions:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eThe DOC becomes active (light‑off) at temperatures around \u003cstrong\u003e200–250°C\u003c\/strong\u003e.\u003c\/li\u003e\n        \u003cli\u003eOptimal conversion efficiency (over 90% for CO and HC) is achieved at \u003cstrong\u003e300–450°C\u003c\/strong\u003e.\u003c\/li\u003e\n        \u003cli\u003eExcessive heat above \u003cstrong\u003e650°C\u003c\/strong\u003e can cause thermal degradation of the catalyst coating.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eCritical Role in the System:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eBy converting NO to NO₂, the DOC provides the oxidant needed for \u003cstrong\u003epassive DPF regeneration\u003c\/strong\u003e, which burns off trapped soot at lower temperatures (around 300–350°C).\u003c\/li\u003e\n        \u003cli\u003eIt also protects the downstream SCR (Selective Catalytic Reduction) catalyst from HC and CO poisoning.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q3 – DOC涂层的区别？ --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ3\u003c\/span\u003e Difference between DOC coatings?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eThe main difference in DOC coatings lies in the \u003cstrong\u003eprecious metal loading\u003c\/strong\u003e (expressed in grams per cubic foot — g\/cft) and the \u003cstrong\u003ePt:Pd ratio\u003c\/strong\u003e. Higher loadings and specific ratios are required to meet stricter emission standards.\u003c\/p\u003e\n\n      \u003ctable\u003e\n        \u003cthead\u003e\n          \u003ctr\u003e\n            \u003cth\u003eStandard\u003c\/th\u003e\n            \u003cth\u003ePrecious Metal Loading\u003c\/th\u003e\n            \u003cth\u003ePt:Pd Ratio\u003c\/th\u003e\n          \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eEuro 5\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e20 g\/cft\u003c\/td\u003e\n            \u003ctd\u003e4:1\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eEuro 6\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e40 g\/cft\u003c\/td\u003e\n            \u003ctd\u003e4:1\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n\n      \u003cp\u003e\u003cstrong\u003eExplanation:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEuro 5\u003c\/strong\u003e requires \u003cstrong\u003e20 g\/cft\u003c\/strong\u003e (20 grams of precious metals per cubic foot of substrate volume) to achieve the required CO and HC conversion efficiency under the NEDC test cycle.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eEuro 6\u003c\/strong\u003e requires a higher loading of \u003cstrong\u003e40 g\/cft\u003c\/strong\u003e (40 grams per cubic foot) to meet the stricter real‑driving emission (RDE) requirements, ensuring the DOC remains effective over a wider range of operating conditions and throughout its lifetime.\u003c\/li\u003e\n        \u003cli\u003eThe \u003cstrong\u003e4:1 Pt:Pd ratio\u003c\/strong\u003e is a common formulation that balances cost (palladium is less expensive than platinum) while maintaining high oxidation activity and sulfur tolerance.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003eHigher loadings provide better durability, more consistent performance under variable temperatures, and longer service life — which is why Euro 6 demands twice the loading of Euro 5.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q4 – 金属DOC和陶瓷DOC催化剂的区别 --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ4\u003c\/span\u003e Difference between metal DOC and ceramic DOC?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eBoth metal and ceramic DOC catalysts serve the same purpose — oxidising CO, HC, and NO. However, they differ significantly in substrate material and performance characteristics. The table below summarizes the key differences:\u003c\/p\u003e\n\n      \u003ctable\u003e\n        \u003cthead\u003e\n          \u003ctr\u003e\n            \u003cth\u003eProperty\u003c\/th\u003e\n            \u003cth\u003eMetal DOC\u003c\/th\u003e\n            \u003cth\u003eCeramic DOC\u003c\/th\u003e\n          \u003c\/tr\u003e\n        \u003c\/thead\u003e\n        \u003ctbody\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eFeCrAl alloy (ferritic stainless steel)\u003c\/td\u003e\n            \u003ctd\u003eCordierite (2MgO·2Al₂O₃·5SiO₂)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eWall Thickness\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e0.03 – 0.10 mm (very thin)\u003c\/td\u003e\n            \u003ctd\u003e0.10 – 0.20 mm\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eCell Density (CPSI)\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003e100 – 1200 CPSI (wider range)\u003c\/td\u003e\n            \u003ctd\u003e100 – 600 CPSI (limited)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eThermal Conductivity\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eHigh (100–200× faster than ceramic)\u003c\/td\u003e\n            \u003ctd\u003eLow (1–3 W\/mK)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eLight‑off Time\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eFaster (30–45 seconds)\u003c\/td\u003e\n            \u003ctd\u003eSlower (2–3 minutes)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eBackpressure\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eLower (due to thinner walls)\u003c\/td\u003e\n            \u003ctd\u003eHigher\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eMechanical Strength\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eHigh (resists vibration and impact)\u003c\/td\u003e\n            \u003ctd\u003eBrittle (prone to cracking)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eThermal Shock Resistance\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eExcellent\u003c\/td\u003e\n            \u003ctd\u003eGood but limited\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eLight (800–1200 g)\u003c\/td\u003e\n            \u003ctd\u003eHeavier (1500–2000 g)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eShape Flexibility\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eHigh (any shape possible)\u003c\/td\u003e\n            \u003ctd\u003eLimited (round\/oval only)\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eCost\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003eHigher\u003c\/td\u003e\n            \u003ctd\u003eLower\u003c\/td\u003e\n          \u003c\/tr\u003e\n          \u003ctr\u003e\n            \u003ctd\u003e\u003cstrong\u003eTypical Application\u003c\/strong\u003e\u003c\/td\u003e\n            \u003ctd\u003ePerformance, heavy‑duty, off‑highway\u003c\/td\u003e\n            \u003ctd\u003ePassenger cars, standard OEM\u003c\/td\u003e\n          \u003c\/tr\u003e\n        \u003c\/tbody\u003e\n      \u003c\/table\u003e\n\n      \u003cp\u003e\u003cstrong\u003eKey Takeaways:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMetal DOC\u003c\/strong\u003e is preferred where fast warm‑up, low backpressure, and durability are critical — such as high‑performance engines, off‑road vehicles, and applications with frequent thermal cycling.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCeramic DOC\u003c\/strong\u003e is more cost‑effective and performs well in standard passenger car applications with stable operating conditions.\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003eThe choice between metal and ceramic depends on your specific application requirements, budget, and emission targets.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q5 – 排放标准和CPSI的区别（修改） --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ5\u003c\/span\u003e Emission standards and CPSI differences\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eThe following are our suggested reference rates. If you are unsure, please contact our staff.\u003c\/p\u003e\n\n      \u003cul\u003e\n        \u003cli\u003e\u003cstrong\u003e20g\/cft 400-500cpsi = Euro 5\u003c\/strong\u003e\u003c\/li\u003e\n        \u003cli\u003e\u003cstrong\u003e30g\/cft 300-500cpsi = Euro 5\u003c\/strong\u003e\u003c\/li\u003e\n        \u003cli\u003e\u003cstrong\u003e40g\/cft 200-500cpsi = Euro 5\u003c\/strong\u003e\u003c\/li\u003e\n        \u003cli\u003e\u003cstrong\u003e30g\/cft 300-500cpsi = Euro 6\u003c\/strong\u003e\u003c\/li\u003e\n        \u003cli\u003e\u003cstrong\u003e40g\/cft 200-500cpsi = Euro 6\u003c\/strong\u003e\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003eThese combinations of precious metal loading (g\/cft) and cell density (CPSI) are typical benchmarks for achieving the specified Euro emission standard. The actual performance may vary depending on engine calibration, exhaust temperature profile, and other system components. For tailored recommendations, please consult our technical team.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q6 – 质保：1年 --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ6\u003c\/span\u003e Warranty policy: 1 year\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eWe offer a \u003cstrong\u003e1‑year warranty\u003c\/strong\u003e on our ceramic DOC products from the date of purchase.\u003c\/p\u003e\n\n      \u003cp\u003e\u003cstrong\u003eWhat is covered:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eManufacturing defects in the ceramic substrate, such as cracks, broken walls, or structural failures that occur under normal use.\u003c\/li\u003e\n        \u003cli\u003eCoating integrity for coated DOC (flaking or detachment of the washcoat).\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eWhat is NOT covered:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eDamage caused by improper installation (e.g., over‑torquing, incorrect orientation, or physical impact).\u003c\/li\u003e\n        \u003cli\u003eEngine‑related issues (misfires, excessive oil consumption, or incorrect air‑fuel mixture) that lead to overheating or clogging.\u003c\/li\u003e\n        \u003cli\u003eFuel contamination (high‑sulfur fuel, biodiesel impurities, or additives that poison the catalyst).\u003c\/li\u003e\n        \u003cli\u003eThermal degradation due to sustained exhaust temperatures above 650°C.\u003c\/li\u003e\n        \u003cli\u003eNormal wear and tear or soot loading beyond the filter's capacity.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eClaim procedure:\u003c\/strong\u003e To make a warranty claim, please contact our support team with your order number, installation records, and clear photos of the defect. We will review each case individually.\u003c\/p\u003e\n\n      \u003cp\u003eWe recommend professional installation and regular maintenance to ensure the DOC operates within its design parameters.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q7 – 金属DOC催化剂的安装指南 --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ7\u003c\/span\u003e Installation guide for metal DOC catalysts\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eInstalling a metal DOC catalyst requires careful attention to both mechanical and thermal factors. Metal substrates are more forgiving than ceramic in terms of brittleness, but they still need proper handling. Follow these guidelines for a successful installation:\u003c\/p\u003e\n\n      \u003cp\u003e\u003cstrong\u003eMounting Position:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eThe DOC must be installed \u003cstrong\u003eas close as possible to the engine\u003c\/strong\u003e (typically after the turbocharger) to ensure fast light‑off.\u003c\/li\u003e\n        \u003cli\u003eIt should be positioned \u003cstrong\u003ebefore the DPF\u003c\/strong\u003e and \u003cstrong\u003ebefore the SCR\u003c\/strong\u003e (if equipped).\u003c\/li\u003e\n        \u003cli\u003eEnsure the flow direction arrow points toward the rear of the vehicle.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eMechanical Support \u0026amp; Housing:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eMetal substrates are less brittle than ceramic, but still require secure mounting to prevent fatigue failure.\u003c\/li\u003e\n        \u003cli\u003eUse appropriate metal cans, mounting mats (if required), and brackets. Metal substrates often use a \u003cstrong\u003ewelded or brazed\u003c\/strong\u003e attachment to the housing, which provides excellent durability.\u003c\/li\u003e\n        \u003cli\u003eEnsure the housing allows for thermal expansion — metal substrates expand more than ceramic, so adequate clearance is necessary.\u003c\/li\u003e\n        \u003cli\u003eUse high‑temperature gaskets and sealing materials to prevent exhaust gas bypass.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eExhaust Pipe Preparation:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eThoroughly clean the pipe ends to remove rust, carbon, and debris.\u003c\/li\u003e\n        \u003cli\u003eIf welding is required, use \u003cstrong\u003estainless steel filler material\u003c\/strong\u003e compatible with the exhaust material (typically 304 or 409 stainless).\u003c\/li\u003e\n        \u003cli\u003eFit new gaskets on all flanged connections — never reuse old gaskets.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eWelding Considerations (for weld‑on units):\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eMetal DOC substrates can withstand higher welding temperatures than ceramic, but avoid excessive heat input to prevent distortion of the thin metal foils.\u003c\/li\u003e\n        \u003cli\u003eUse \u003cstrong\u003eTIG or MIG welding\u003c\/strong\u003e with appropriate settings. Tack‑weld in several positions before final welding.\u003c\/li\u003e\n        \u003cli\u003eAllow the welds to cool slowly to avoid thermal stress.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003eSensor Connections:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eIf the DOC has integrated temperature sensors or NOx sensors, ensure they are correctly connected to the ECU.\u003c\/li\u003e\n        \u003cli\u003eRoute sensor wiring away from hot exhaust components and moving parts.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cp\u003e\u003cstrong\u003ePost‑Installation Testing:\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003eStart the engine and check for exhaust leaks around all connections.\u003c\/li\u003e\n        \u003cli\u003eAllow the engine to reach operating temperature and monitor the DOC's performance via diagnostic tools (exhaust gas temperature, backpressure, and NOx\/CO readings).\u003c\/li\u003e\n        \u003cli\u003ePerform a test drive under various load conditions to confirm the catalyst reaches light‑off temperature and operates correctly.\u003c\/li\u003e\n      \u003c\/ul\u003e\n\n      \u003cdiv class=\"warning-box\"\u003e\n        ⚠️ \u003cstrong\u003eImportant Notes:\u003c\/strong\u003e\u003cbr\u003e\n        • Metal substrates are highly durable but can still be damaged by excessive heat (\u0026gt;950°C) — ensure proper engine tuning.\u003cbr\u003e\n        • DO NOT use leaded fuel or high‑sulfur diesel (\u0026gt; 500 ppm), as these will poison the catalyst.\u003cbr\u003e\n        • Ensure the engine is in good mechanical condition (no misfires, no excessive oil consumption) before installation.\u003cbr\u003e\n        • If the vehicle has a DPF, ensure the DOC is correctly positioned upstream to allow proper passive regeneration.\u003cbr\u003e\n        • We strongly recommend professional installation by a certified diesel exhaust technician.\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q8 – 发货\/运输时间 --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ8\u003c\/span\u003e What are your shipping \u0026amp; delivery times?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eOur shipping and delivery times depend on stock availability:\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eIf we have stock:\u003c\/strong\u003e We ship within 1–3 business days. Delivery typically takes \u003cstrong\u003e12–15 days\u003c\/strong\u003e (including customs clearance and duties).\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eIf we are out of stock:\u003c\/strong\u003e Production and handling take 15–20 business days, then delivery takes approximately \u003cstrong\u003e12–15 days\u003c\/strong\u003e (including customs clearance and duties).\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp\u003e\u003cstrong\u003eAll shipments are sent DDP (Delivered Duty Paid)\u003c\/strong\u003e – this means that all customs clearance fees, import duties, and taxes are already included in the total price you pay. You will not be charged any extra fees upon delivery.\u003c\/p\u003e\n      \u003cp\u003eIf you need faster delivery, please contact us to arrange expedited shipping via \u003cstrong\u003eDHL, UPS, or FEDEX\u003c\/strong\u003e (additional charges apply).\u003c\/p\u003e\n      \u003cp\u003eWe will provide you with a tracking number as soon as your order is dispatched.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q9 – 联系我们 --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ9\u003c\/span\u003e How can I contact you?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eYou can reach our team directly via WhatsApp or email. We are happy to assist with any questions about products, sizing, orders, or technical support.\u003c\/p\u003e\n\n      \u003cdiv class=\"contact-item\"\u003e\n        \u003cstrong\u003eDavin\u003c\/strong\u003e\u003cbr\u003e\n        WhatsApp: \u003ca href=\"https:\/\/wa.me\/8613335696939\" target=\"_blank\"\u003e+86 133 3569 6939\u003c\/a\u003e\u003cbr\u003e\n        E-mail: \u003ca href=\"mailto:KSRCAT@proton.me\"\u003eKSRCAT@proton.me\u003c\/a\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"contact-item\"\u003e\n        \u003cstrong\u003eAlison\u003c\/strong\u003e\u003cbr\u003e\n        WhatsApp: \u003ca href=\"https:\/\/wa.me\/8615082475717\" target=\"_blank\"\u003e+86 150 8247 5717\u003c\/a\u003e\u003cbr\u003e\n        E-mail: \u003ca href=\"mailto:Ksrcatalytic@gmail.com\"\u003eKsrcatalytic@gmail.com\u003c\/a\u003e\n      \u003c\/div\u003e\n\n      \u003cdiv class=\"contact-item\"\u003e\n        \u003cstrong\u003eMia\u003c\/strong\u003e\u003cbr\u003e\n        WhatsApp: \u003ca href=\"https:\/\/wa.me\/8613681711685\" target=\"_blank\"\u003e+86 136 8171 1685\u003c\/a\u003e\u003cbr\u003e\n        E-mail: \u003ca href=\"mailto:Kesairay@proton.me\"\u003eKesairay@proton.me\u003c\/a\u003e\n      \u003c\/div\u003e\n\n      \u003cp\u003eWe typically respond within 24 hours (Monday–Saturday). Please include your order number or vehicle details for faster assistance.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003c!-- Q10 – 公司总部地址 --\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003e\u003cspan class=\"q-mark\"\u003eQ10\u003c\/span\u003e Where is your headquarters located?\u003c\/summary\u003e\n    \u003cdiv class=\"answer-wrap\"\u003e\n      \u003cp\u003eOur company headquarters is located at:\u003c\/p\u003e\n      \u003cp\u003e\u003cstrong\u003eBuilding C, Zhongguan Innovation Center, Dongcheng 2nd Road, Pujiang Town, Minhang District, Shanghai, China\u003c\/strong\u003e\u003c\/p\u003e\n      \u003cp\u003eWe welcome business visits by appointment. Please contact us in advance to arrange a suitable time.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e","brand":"SVIPCAT Store","offers":[{"title":"198x90mm \/ 20g\/cft \/ 200cpsi","offer_id":54437588861274,"sku":null,"price":221.6,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 20g\/cft \/ 300cpsi","offer_id":54437588894042,"sku":null,"price":223.91,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 20g\/cft \/ 400cpsi","offer_id":54437588926810,"sku":null,"price":226.22,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 20g\/cft \/ 500cpsi","offer_id":54437588959578,"sku":null,"price":228.53,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 30g\/cft \/ 200cpsi","offer_id":54437588992346,"sku":null,"price":300.08,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 30g\/cft \/ 300cpsi","offer_id":54437589025114,"sku":null,"price":302.39,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 30g\/cft \/ 400cpsi","offer_id":54437589057882,"sku":null,"price":304.7,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 30g\/cft \/ 500cpsi","offer_id":54437589090650,"sku":null,"price":307.01,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 40g\/cft \/ 200cpsi","offer_id":54437589123418,"sku":null,"price":373.95,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 40g\/cft \/ 300cpsi","offer_id":54437589156186,"sku":null,"price":376.26,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 40g\/cft \/ 400cpsi","offer_id":54437589188954,"sku":null,"price":378.57,"currency_code":"GBP","in_stock":true},{"title":"198x90mm \/ 40g\/cft \/ 500cpsi","offer_id":54437589221722,"sku":null,"price":380.88,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 20g\/cft \/ 200cpsi","offer_id":54437589254490,"sku":null,"price":246.4,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 20g\/cft \/ 300cpsi","offer_id":54437589287258,"sku":null,"price":248.97,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 20g\/cft \/ 400cpsi","offer_id":54437589320026,"sku":null,"price":251.53,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 20g\/cft \/ 500cpsi","offer_id":54437589352794,"sku":null,"price":254.1,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 30g\/cft \/ 200cpsi","offer_id":54437589385562,"sku":null,"price":333.67,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 30g\/cft \/ 300cpsi","offer_id":54437589418330,"sku":null,"price":336.23,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 30g\/cft \/ 400cpsi","offer_id":54437589451098,"sku":null,"price":338.8,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 30g\/cft \/ 500cpsi","offer_id":54437589483866,"sku":null,"price":341.37,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 40g\/cft \/ 200cpsi","offer_id":54437589516634,"sku":null,"price":415.8,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 40g\/cft \/ 300cpsi","offer_id":54437589549402,"sku":null,"price":418.37,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 40g\/cft \/ 400cpsi","offer_id":54437589582170,"sku":null,"price":420.93,"currency_code":"GBP","in_stock":true},{"title":"198x100mm \/ 40g\/cft \/ 500cpsi","offer_id":54437589614938,"sku":null,"price":423.5,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/5164\/3226\/files\/1_09aeb395-3824-4236-8e49-5d9fc393f44f.jpg?v=1784281783","url":"https:\/\/www.svipcat.com\/products\/metal-doc-198mm","provider":"SVIPCAT Store","version":"1.0","type":"link"}