{"product_id":"mirka-iridium-9-in-grip-9h-styro-40-grit-sanding-disc-25-pack-for-polystyrene-and-wall-sanding-24-9cu-040","title":"Mirka Iridium 9-in. Grip 9H Styro 40 Grit Sanding Disc 25-Pack for Polystyrene and Wall Sanding (24-9CU-040)","description":"\u003csection data-aplus\u003e\n  \u003cdetails id=\"product-features\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"features\"\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/grit-range.svg\" alt=\"grit-range\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003eCoarse 40 Grit Cut\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eBuilt for aggressive stock removal when you need to level polystyrene fast. The coarse grit helps knock high spots down quickly before finish steps.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/diameter.svg\" alt=\"diameter\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003eLarge 9 Inch Coverage\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eThe 225 mm disc size covers more surface with each pass, which matters on broad wall and ceiling work where small discs waste time.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"card\"\u003e\n          \u003cdiv class=\"card-inside\"\u003e\n            \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/vacuum-compatibility.svg\" alt=\"vacuum-compatibility\" class=\"aplusicon\"\u003e\n          \u003c\/div\u003e\n          \u003cdiv\u003e\u003cstrong\u003eMade for the STYRO System\u003c\/strong\u003e\u003c\/div\u003e\n          \u003cdiv class=\"feature-card\"\u003eThis Mirka abrasive is part of the STYRO setup designed to reduce debris while leveling polystyrene and textured surfaces, so cleanup stays more manageable on site.\u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-overview\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eOverview\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\" data-product-summary\u003e\n      \u003cp\u003eThe \u003cstrong\u003eMirka IRIDIUM 9\" Grip 9H Styro sanding disc\u003c\/strong\u003e, Model \u003cstrong\u003e24-9CU-040\u003c\/strong\u003e, is a coarse abrasive disc built for fast material removal on polystyrene, textured walls, and ceilings. This is a \u003cstrong\u003esanding disc designed for leveling and shaping broad surfaces\u003c\/strong\u003e. If you are working exterior insulation systems, wall prep, or surface correction where speed matters more than fine finish, this is the kind of disc you reach for first.\u003c\/p\u003e\n      \u003cp\u003eWhat makes this disc matter is the combination of a large 9 inch working face and a coarse 40 grit cut. That gives you more surface coverage per pass and a faster bite into foam and similar materials. On big panels and overhead work, that means less time chasing uneven areas with a smaller abrasive and fewer passes to get a flat, workable surface.\u003c\/p\u003e\n      \u003cp\u003eThe Grip backing is important because it is built for quick attachment and removal in the right sanding setup. That saves time when you are swapping worn discs on active jobs instead of fighting adhesive-backed consumables. The 9-hole pattern is also part of the system fit, so this is not just a generic round abrasive. It is aimed at the matching 225 mm platform where dust and debris control are part of the process.\u003c\/p\u003e\n      \u003cp\u003eMirka positions the IRIDIUM Styro line as part of a system intended to eliminate debris when leveling polystyrene and textured walls and ceilings. In real use, that matters because foam and surface prep dust can get messy fast. Pairing the disc with the intended STYRO setup helps keep material moving away from the work area instead of loading up everything around you.\u003c\/p\u003e\n      \u003cp\u003eMaterial range is broader than polystyrene alone. Source data also lists plaster, filler, paint removal, primer, composites, plastics, veneer, hardwood, softwood, lacquer, chipboard, MDF, HDF, and several metals. Realistically, the coarse 40 grit version is best suited to aggressive shaping, stripping, and leveling tasks where you want fast removal, not a finish-ready surface. That makes it a practical choice for prep stages, not your last sanding step.\u003c\/p\u003e\n      \u003cp\u003eThis Mirka IRIDIUM 9\" Grip 9H Styro sanding disc makes the most sense for contractors handling insulation finishing systems, drywall and plaster prep, remodeling crews doing surface correction, and serious users already working in the Mirka STYRO setup. If your priority is fast stock removal across wide areas with a disc sized for the job, this is the right consumable. If you need fine finishing, step down to a finer grit instead of expecting a 40 grit disc to do two jobs.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-benefits\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eCover Large Surfaces Faster\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"row\"\u003e\n        \u003cdiv class=\"img\"\u003e\n          \u003cimg src=\"https:\/\/cdn.anglera.com\/assets\/74d6ed76-fe0d-4d23-a9db-1f8749ca9ef2\/20260623695_5.jpg\" alt=\"Mirka IRIDIUM 9 inch Grip 9H Styro sanding disc used on exterior polystyrene wall panels during surface leveling on scaffolding\" class=\"tnblock-img\"\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"copy\"\u003e\n          \u003cp\u003eBig wall and ceiling surfaces punish small abrasives. The 225 mm format is built to flatten more area with each sweep, which helps you move through leveling work without turning one elevation into an all-day sanding job.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e9 inch diameter covers more surface per pass\u003c\/li\u003e\n            \u003cli\u003eDesigned for leveling polystyrene and textured walls and ceilings\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-benefits-2\" class=\"acc flip\"\u003e\n    \u003csummary\u003e\u003ch2\u003eAggressive Cut for Early Prep Work\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"row\"\u003e\n        \u003cdiv class=\"img\"\u003e\n          \u003cimg src=\"https:\/\/cdn.anglera.com\/assets\/74d6ed76-fe0d-4d23-a9db-1f8749ca9ef2\/20260623695_4.jpg\" alt=\"Mirka IRIDIUM 9 inch Grip 9H Styro sanding disc front and backing view showing coarse abrasive face and grip attachment\" class=\"tnblock-img\"\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"copy\"\u003e\n          \u003cp\u003eThe 40 grit version is the one for rough shaping and fast correction. When the goal is removing material, knocking down ridges, or stripping back a surface before finer sanding, coarse grit saves time.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003e40 grit for heavy stock removal and leveling\u003c\/li\u003e\n            \u003cli\u003eGrip backing supports quick disc changes in the right system\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-benefits-3\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eBuilt Around the Mirka STYRO Setup\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"row\"\u003e\n        \u003cdiv class=\"img\"\u003e\n          \u003cimg src=\"https:\/\/cdn.anglera.com\/assets\/74d6ed76-fe0d-4d23-a9db-1f8749ca9ef2\/20260623695_3.jpg\" alt=\"Mirka IRIDIUM 9 inch Grip 9H Styro sanding disc packaging for the STYRO sanding system with large disc application platform\" class=\"tnblock-img\"\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"copy\"\u003e\n          \u003cp\u003eThis abrasive is not a random universal disc. It is part of Mirka's STYRO system for controlling debris during surface leveling, which is a real advantage when you are working foam and textured finishes that can make a mess in a hurry.\u003c\/p\u003e\n          \u003cul\u003e\n            \u003cli\u003ePart of the IRIDIUM Styro system\u003c\/li\u003e\n            \u003cli\u003eBuilt for 9-hole, 225 mm style setup\u003c\/li\u003e\n          \u003c\/ul\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-whats-included\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tnincluded-wrapper\"\u003e\n        \u003cul\u003e\n          \u003cli\u003e(25) Mirka IRIDIUM 9\" Grip 9H Styro sanding discs, 40 grit\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"included-note\"\u003e\n        \u003cp\u003eBacking pad, interface components, and sander are not included.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-key-specifications\" class=\"acc\" open\u003e\n    \u003csummary\u003e\u003ch2\u003eKey Specifications\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003ctable class=\"aplusspecs\"\u003e\n        \u003ctr\u003e\n          \u003cth\u003eDiameter\u003c\/th\u003e\n          \u003ctd\u003e9 in \/ 225 mm\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eGrit\u003c\/th\u003e\n          \u003ctd\u003e40\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eHole Pattern\u003c\/th\u003e\n          \u003ctd\u003e9-hole\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eAttachment Type\u003c\/th\u003e\n          \u003ctd\u003eGrip\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003ePieces Per Pack\u003c\/th\u003e\n          \u003ctd\u003e25\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003ePrimary Use\u003c\/th\u003e\n          \u003ctd\u003eSanding and leveling\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003eSuitable Materials\u003c\/th\u003e\n          \u003ctd\u003ePolystyrene, plaster \/ filler, paint, primer, plastics, wood, composites, MDF \/ HDF, chipboard, veneer, metals\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003cth\u003ePart Number\u003c\/th\u003e\n          \u003ctd\u003e24-9CU-040\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/table\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-compatibility\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"compat-list\"\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/diameter.svg\" alt=\"diameter\" class=\"icon-sm\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003eDisc Size\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003eFits 9 inch \/ 225 mm sanding setups designed for this disc format.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/vacuum-compatibility.svg\" alt=\"vacuum-compatibility\" class=\"icon-sm\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003eMirka STYRO System\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003eDesigned as part of the Mirka STYRO system for leveling polystyrene and textured walls and ceilings with debris control in mind.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv class=\"compat-row\"\u003e\n          \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/specs.svg\" alt=\"specs\" class=\"icon-sm\"\u003e\n          \u003cdiv\u003e\n            \u003cstrong\u003eBacking Interface\u003c\/strong\u003e\n            \u003cdiv class=\"compat-detail\"\u003eUses a Grip attachment and a 9-hole pattern, so match both the backing pad and hole configuration before ordering.\u003c\/div\u003e\n          \u003c\/div\u003e\n        \u003c\/div\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-applications-uses\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eBuilt For\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tags\"\u003e\n        \u003cspan class=\"tag\"\u003eEIFS \/ insulation finishing\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eDrywall and plaster prep\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eRemodeling\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eConstruction\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003ePaint removal\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eSurface leveling\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eTextured wall prep\u003c\/span\u003e\n        \u003cspan class=\"tag\"\u003eSerious DIY \/ Hobbyist\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-pro-tips\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003ePro Tip\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"tip-row\"\u003e\n        \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/specs.svg\" alt=\"specs\" class=\"icon-lg\"\u003e\n        \u003cp class=\"tip-text\"\u003eUse this 40 grit disc for your first pass only. Once the polystyrene or textured surface is flat, switch to a finer grit instead of trying to force one disc to handle both leveling and finish prep.\u003c\/p\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-tool-nut-take\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eTool Nut's Take\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cdiv class=\"eyebrow\"\u003eTool Nut's Take\u003c\/div\u003e\n      \u003ch3\u003eMirka IRIDIUM 9\" Grip 9H Styro sanding disc for fast wall prep\u003c\/h3\u003e\n      \u003cp\u003eThis is the kind of abrasive that makes sense when you have a lot of surface to flatten and no patience for slow progress.\u003c\/p\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWho it's for:\u003c\/strong\u003e Contractors and serious users working polystyrene, textured walls, ceilings, plaster, and other broad prep surfaces in a Mirka-style sanding setup.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhy it stands out:\u003c\/strong\u003e The big 9 inch format, 9-hole pattern, and coarse 40 grit are aimed squarely at quick removal and system-based debris control.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWorth knowing:\u003c\/strong\u003e This is a consumable for aggressive prep work, not a finish disc, and you need the right 225 mm Grip setup to use it correctly.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\n  \u003cdetails id=\"product-faqs\" class=\"acc\"\u003e\n    \u003csummary\u003e\u003ch2\u003eCommon Questions\u003c\/h2\u003e\u003c\/summary\u003e\n    \u003cdiv class=\"acc-body\"\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhat is this disc mainly used for?\u003c\/strong\u003e It is made for sanding and leveling, especially on polystyrene and textured walls and ceilings.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhat grit is this version?\u003c\/strong\u003e This part number is the 40 grit version, which is suited to aggressive stock removal and early-stage prep.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWhat size sander does it fit?\u003c\/strong\u003e It is a 9 inch, 225 mm Grip disc with a 9-hole pattern, so it should be matched to that backing size and hole layout.\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCan it be used on materials beyond polystyrene?\u003c\/strong\u003e Yes. Source data also lists plaster, filler, paint, primer, plastics, wood products, composites, and several metals among its suitable materials.\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/details\u003e\n\u003c\/section\u003e","brand":"Mirka","offers":[{"title":"Default Title","offer_id":53385928114470,"sku":"24-9CU-040-MIRKA","price":72.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0933\/1582\/5958\/files\/20260623695_1.jpg?v=1782171932","url":"https:\/\/www.toolnut.com\/products\/mirka-iridium-9-in-grip-9h-styro-40-grit-sanding-disc-25-pack-for-polystyrene-and-wall-sanding-24-9cu-040","provider":"Tool Nut","version":"1.0","type":"link"}