{"product_id":"bostik-cempolay-ultra-strong-20kg-fast-setting-self-levelling-compound","title":"Bostik Cempolay Ultra Strong – 20kg - Fast-Setting Self-Levelling Compound","description":"\u003ch3\u003eHigh-Strength, Fast-Setting Self-Levelling Compound for Interior \u0026amp; Select Exterior Floors\u003c\/h3\u003e\n\n\u003cp\u003e\n  Bostik Cempolay Ultra Strong is a high-performance, cement-based self-levelling compound formulated for smoothing uneven floors prior to laying final floor coverings. With exceptional compressive strength and rapid setting properties, it is ideal for both residential and commercial environments. Suitable for application on a wide range of substrates, it is compatible with underfloor heating systems and can be used for certain exterior applications.\n\u003c\/p\u003e\n\n\u003ch4\u003eKey Features \u0026amp; Benefits\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTriple-Function:\u003c\/strong\u003e Levels, smooths, and strengthens floor surfaces in a single application\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Compressive Strength:\u003c\/strong\u003e ≥20 N\/mm² after 28 days (EN 13813 – CT-C20-F6)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast-Setting:\u003c\/strong\u003e Foot traffic in as little as 2 hours; tile in 3 hours (under 10mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExtended Thickness:\u003c\/strong\u003e Apply from 3mm up to 20mm in one layer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnderfloor Heating Compatible:\u003c\/strong\u003e Suitable for warm water systems (max 27°C surface)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWater \u0026amp; Frost Resistant:\u003c\/strong\u003e Can be used in certain external environments\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct \u0026amp; Technical Details\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eForm:\u003c\/strong\u003e Grey, free-flowing cement-based powder\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBag Size:\u003c\/strong\u003e 20kg\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoverage:\u003c\/strong\u003e\n    \u003cul\u003e\n      \u003cli\u003eApprox. 4m² at 3mm thickness per 20kg bag\u003c\/li\u003e\n      \u003cli\u003eApprox. 0.6m² at 20mm thickness\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMix Ratio:\u003c\/strong\u003e 4 litres clean, cold water per 20kg\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Time:\u003c\/strong\u003e 15–20 minutes at 20°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFoot Traffic:\u003c\/strong\u003e Approx. 2 hours\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrying for Tiling:\u003c\/strong\u003e 3 hours (ceramic, under 10mm), 24 hours for impervious coverings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication Temp:\u003c\/strong\u003e +5°C to +27°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShelf Life:\u003c\/strong\u003e 12 months unopened in cool, dry conditions (5°C–25°C)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSuitable Substrates\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eConcrete \u0026amp; cement\/sand screeds\u003c\/li\u003e\n  \u003cli\u003eStone, quarry tiles \u0026amp; unglazed ceramic tiles\u003c\/li\u003e\n  \u003cli\u003eCalcium sulphate screeds (with specialist priming)\u003c\/li\u003e\n  \u003cli\u003ePreviously levelled or primed floors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSurface Preparation \u0026amp; Priming\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eEnsure surfaces are clean, dry, structurally sound and free from laitance, grease, oil or dust\u003c\/li\u003e\n  \u003cli\u003eSubstrate moisture should be below 75% RH (use a hygrometer)\u003c\/li\u003e\n  \u003cli\u003ePrime porous surfaces with Bostik Universal Primer (1:2 dilution)\u003c\/li\u003e\n  \u003cli\u003ePrime non-porous surfaces with neat Bostik Universal Primer\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eApplication Instructions\u003c\/h4\u003e\n\u003col\u003e\n  \u003cli\u003eMix 20kg of powder with 4L clean water to a smooth, lump-free consistency\u003c\/li\u003e\n  \u003cli\u003ePour onto the primed subfloor and spread using a smoothing trowel\u003c\/li\u003e\n  \u003cli\u003eUse a spiked roller to release trapped air and finish the surface\u003c\/li\u003e\n  \u003cli\u003eAllow to cure per thickness and environment before applying finishes\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch4\u003eLimitations \u0026amp; Precautions\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNot suitable for use on timber floors, vinyl, tarmac or weak adhesive residues\u003c\/li\u003e\n  \u003cli\u003eDo not apply if temperatures will drop below 5°C within 24 hours\u003c\/li\u003e\n  \u003cli\u003eNot intended for movement-prone or flexible substrates\u003c\/li\u003e\n  \u003cli\u003eFor thick applications \u0026gt;10mm, dry sharp sand can be used (not for heated floors)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eStandards \u0026amp; Compliance\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEN 13813 Classification:\u003c\/strong\u003e CT-C20-F6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompressive Strength:\u003c\/strong\u003e ≥20 N\/mm²\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexural Strength:\u003c\/strong\u003e ≥6 N\/mm²\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFire Classification:\u003c\/strong\u003e Class F\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSuitable for Use With\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eCeramic, porcelain and natural stone tiles\u003c\/li\u003e\n  \u003cli\u003eLaminate, wood, carpet and vinyl (after full cure)\u003c\/li\u003e\n  \u003cli\u003eUnderfloor heating systems (water-fed, not electric)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\n  Bostik Cempolay Ultra Strong offers a professional, high-performance floor smoothing solution with rapid setting and high durability. It’s ideal for preparing surfaces in time-critical installations across domestic, commercial, and light industrial spaces.\n\u003c\/p\u003e\n","brand":"DIY Refurb","offers":[{"title":"Default Title","offer_id":53341487726930,"sku":"30622970","price":36.74,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1060\/4006\/6386\/files\/Bostik_Cempolay_Ultra.webp?v=1777965775","url":"https:\/\/glazingsuppliesdirect.com\/products\/bostik-cempolay-ultra-strong-20kg-fast-setting-self-levelling-compound","provider":"Glazing Supplies Direct","version":"1.0","type":"link"}