{"product_id":"mapeproof-swell-hydro-expansive-waterproofing-sealant","title":"Mapei Mapeproof Swell Hydro-Expansive Waterproofing Sealant 320ml","description":"\u003cp\u003e\u003cstrong\u003eMapei Mapeproof Swell\u003c\/strong\u003e is a one-component, rubber-based hydrophilic sealant paste that expands on contact with water to form a flexible, watertight seal in reinforced concrete. Supplied in a 320ml cartridge and applied with a standard extrusion gun, it's the go-to solution for sealing pipe penetrations, cold joints, construction joints and seeping cracks in basements, tanks, pools and below-ground structures.\u003c\/p\u003e\n\u003cp\u003eOnce confined within a joint or crack, Mapeproof Swell increases in volume by at least 100% when it meets water, pressing tightly against the surrounding concrete and resisting considerable hydrostatic pressure. It bonds to slightly damp surfaces, so there's no need to wait for a structure to fully dry out before sealing.\u003c\/p\u003e\n\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelf-sealing on contact with water\u003c\/strong\u003e – minimum 100% volumetric expansion closes the gap as soon as water arrives\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks on damp substrates\u003c\/strong\u003e – bonds to slightly damp, clean and sound concrete (no standing water)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHighly flexible\u003c\/strong\u003e – elongation above 700% accommodates movement without losing the seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick, clean application\u003c\/strong\u003e – gun-applied from a 320ml cartridge, no mixing required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWorks with any infiltrating water\u003c\/strong\u003e – suitable for use with any kind of water that seeps or infiltrates\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-corrosive\u003c\/strong\u003e – safe for use around steel pipework and reinforcement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSealing pipework passing through concrete walls and slabs\u003c\/li\u003e\n\u003cli\u003eSealing cold joints and construction joints in reinforced concrete\u003c\/li\u003e\n\u003cli\u003eSealing cracks where water is seeping through reinforced concrete structures\u003c\/li\u003e\n\u003cli\u003eSealing spacers in formwork\u003c\/li\u003e\n\u003cli\u003eSealing lights and drainage outlets in swimming pools and water tanks\u003c\/li\u003e\n\u003cli\u003eBonding various types of joints\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUsed by builders, groundworkers, waterproofing contractors, pool installers and basement specialists on new-build and repair work alike.\u003c\/p\u003e\n\n\u003ch3\u003eHow It Works \u0026amp; Application Guidance\u003c\/h3\u003e\n\u003cp\u003eMapeproof Swell expands in all three directions, towards the path of least resistance – so it \u003cstrong\u003emust always be confined\u003c\/strong\u003e within a joint, chase or crack. It is not suitable for surface-only application.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRemove all dust, loose material and anything that could affect the bond. The surface may be damp, but there must be no water on it.\u003c\/li\u003e\n\u003cli\u003eOn steel pipework, remove all traces of oil and grease with ethanol.\u003c\/li\u003e\n\u003cli\u003eFor cracked concrete or construction joints, break out the sides to a depth of at least 6cm, clean out, apply Mapeproof Swell, then confine it with a suitable repair mortar.\u003c\/li\u003e\n\u003cli\u003eWhere water is actively seeping, stop the flow with a rapid-setting leak plug first, then apply Mapeproof Swell on both sides, ensuring a boundary of at least 5cm.\u003c\/li\u003e\n\u003cli\u003eCut the nozzle to suit – cutting at the first line gives the normal 6–13mm bead. Pierce the membrane under the nozzle, load into an extrusion gun and apply a continuous, even bead.\u003c\/li\u003e\n\u003cli\u003eWait until the product has fully set before pouring concrete against it.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eSuitable for reinforced concrete, prefabricated concrete elements and steel or plastic pipework passing through concrete. Can be applied on damp or uneven surfaces. Do not apply to dirty or weak surfaces, or to surfaces heavily contaminated with acids or solvents.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e One-component hydrophilic (hydro-expansive) sealant paste\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConsistency:\u003c\/strong\u003e Thixotropic paste\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e Light grey\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack size:\u003c\/strong\u003e 320ml cartridge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoverage:\u003c\/strong\u003e Approx. 3 linear metres per cartridge (6–13mm bead)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVolumetric expansion in water:\u003c\/strong\u003e Minimum 100%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication temperature:\u003c\/strong\u003e +5°C to +40°C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSurface skin formation:\u003c\/strong\u003e 180–200 minutes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePolymerisation time:\u003c\/strong\u003e 2mm every 9 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDensity:\u003c\/strong\u003e 1.25–1.30 g\/cm³\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDry solids content:\u003c\/strong\u003e 90%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShore A hardness (DIN 53505):\u003c\/strong\u003e 32\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElongation (DIN 53504):\u003c\/strong\u003e \u0026gt;700%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLoad at break (DIN 53504):\u003c\/strong\u003e 2.5 N\/mm²\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTear strength (ISO 34-1):\u003c\/strong\u003e 10 N\/mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater sealing:\u003c\/strong\u003e 1 ATM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolubility:\u003c\/strong\u003e Insoluble in water; non-corrosive\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e Up to 12 months in a dry place at +15°C to +25°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eTechnical data are typical values at +23°C and 50% R.H. Product for professional use.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cp\u003e1 x Mapei Mapeproof Swell 320ml cartridge. Extrusion gun not included.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is Mapeproof Swell used for?\u003c\/strong\u003e\u003cbr\u003eIt seals pipe penetrations, cold joints, construction joints and leaking cracks in reinforced concrete. It swells on contact with water to block leak paths in basements, tanks, pools and below-ground structures.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I apply it as a surface sealant?\u003c\/strong\u003e\u003cbr\u003eNo. Mapeproof Swell expands in all directions, so it must be confined within a joint, chase or crack and covered with a suitable repair mortar. It is not designed for surface-only application.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be applied to damp concrete?\u003c\/strong\u003e\u003cbr\u003eYes. It bonds to slightly damp surfaces as long as they're clean and sound, but there must be no standing water on the surface.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow far does one cartridge go?\u003c\/strong\u003e\u003cbr\u003eEach 320ml cartridge gives approximately 3 linear metres of bead at 6–13mm diameter.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan I use it on an actively leaking crack?\u003c\/strong\u003e\u003cbr\u003eStop the water flow first with a rapid-setting leak plug, then apply Mapeproof Swell on both sides of the plug with a boundary of at least 5cm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long before I can pour concrete against it?\u003c\/strong\u003e\u003cbr\u003eWait until the product has fully set. It skins over in 180–200 minutes and cures at roughly 2mm every 9 hours at +23°C.\u003c\/p\u003e\n\n\u003cp\u003eMillcot supplies genuine Mapei waterproofing and construction chemicals to builders, contractors and tilers across the UK – with trade pricing and fast, reliable delivery.\u003c\/p\u003e\n\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0621\/5794\/7096\/files\/1_02063_mapeproof-swell_en_e070d15f36964d44beb0a00a2042752f.pdf?v=1790160014\" target=\"_blank\" rel=\"noopener\" style=\"text-decoration: underline;\"\u003eDownload the Mapei Mapeproof Swell Technical Datasheet (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Mapei","offers":[{"title":"Default Title","offer_id":58499956867455,"sku":"2821126","price":44.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0621\/5794\/7096\/files\/4_2063-mapeproof-swell_275642067e0646c888ec70e530c502d4_e0968b91-a446-40c2-9397-7a999a9ae721.png?v=1790160314","url":"https:\/\/www.millcot.com\/products\/mapeproof-swell-hydro-expansive-waterproofing-sealant","provider":"MILLCOT","version":"1.0","type":"link"}