{"title":"Bentonite Waterstops for Concrete Joint Waterproofing","description":"\u003cp data-start=\"421\" data-end=\"799\"\u003eBentonite waterstops are designed for waterproofing construction joints and penetrations in concrete structures where reliable protection against water ingress is required. These bentonite swelling tapes expand on contact with water and create swelling pressure that helps seal the joint, cracks, and small cavities in the surrounding concrete.\u003c\/p\u003e\n\u003cp data-start=\"801\" data-end=\"1196\"\u003eThis type of waterstop is a practical choice for contractors who need a simple installation process without welding, fittings, or raised concrete curbs. Bentonite waterstops are dimensionally stable, non-sticky, and easy to place before concreting. Because the swelling and shrinking process is reversible, the material can continue reacting to changing moisture conditions over time.\u003c\/p\u003e\n\u003cp data-start=\"1198\" data-end=\"1623\"\u003eThe core material is sodium bentonite, known for its strong swelling and water absorption properties. That makes bentonite swelling tape especially suitable for construction joints exposed to groundwater or water contact. In applications where weather conditions are challenging, selected versions with a protective coating can also be installed in wet conditions, including rain, before being cast into concrete.\u003c\/p\u003e\n\u003cp data-start=\"1625\" data-end=\"1990\"\u003eWhen choosing bentonite waterstops, it is important to consider joint dimensions, expected water exposure, and whether the installation area includes penetrations, basement walls, foundations, tanks, or retaining structures. Good fit where you need dependable joint sealing with straightforward handling on site and proven waterproofing performance.\u003c\/p\u003e","products":[{"product_id":"masterstop-long-time-swelling-waterstop-25-20-mm-5-m","title":"MASTERSTOP LONG TIME Swelling Waterstop 25 × 20 mm – 5 m","description":"\u003cp data-start=\"157\" data-end=\"449\"\u003eMASTERSTOP LONG TIME is a sodium bentonite-based swelling waterstop designed for sealing construction joints in concrete structures. The product is manufactured from sodium bentonite with rubber content and is intended for weather-independent installation in waterproof concrete applications.\u003c\/p\u003e\n\u003cp data-start=\"451\" data-end=\"728\"\u003eThe swelling tape expands upon contact with water, creating pressure against surrounding concrete surfaces to help seal construction joints and prevent water penetration. Depending on the surrounding liquid environment, the swelling volume can reach up to 340% in normal water.\u003c\/p\u003e\n\u003cp data-start=\"730\" data-end=\"957\"\u003eThe product is suitable for areas with frequently changing water levels and offers resistance to various aggressive substances, including alkalis, slurry, biogas, wastewater, de-icing salts, fermentation by-products, and radon.\u003c\/p\u003e\n\u003cp data-start=\"959\" data-end=\"1080\"\u003eMASTERSTOP LONG TIME is certified with CE marking, ETA approval, and General Building Supervisor Board Certificate (abP).\u003c\/p\u003e\n\u003cp data-start=\"1082\" data-end=\"1097\"\u003eKey Features:\u003c\/p\u003e\n\u003cul data-start=\"1098\" data-end=\"1448\"\u003e\n\u003cli data-section-id=\"ta76p5\" data-start=\"1098\" data-end=\"1137\"\u003eSodium bentonite swelling waterstop\u003c\/li\u003e\n\u003cli data-section-id=\"1b5mdj\" data-start=\"1138\" data-end=\"1174\"\u003eWeather-independent installation\u003c\/li\u003e\n\u003cli data-section-id=\"40gmv7\" data-start=\"1175\" data-end=\"1206\"\u003eExpands up to 340% in water\u003c\/li\u003e\n\u003cli data-section-id=\"f6n3bi\" data-start=\"1207\" data-end=\"1244\"\u003eSuitable for varying water levels\u003c\/li\u003e\n\u003cli data-section-id=\"rfl2qp\" data-start=\"1245\" data-end=\"1286\"\u003eWater pressure resistance up to 5 bar\u003c\/li\u003e\n\u003cli data-section-id=\"1c1wfwk\" data-start=\"1287\" data-end=\"1359\"\u003eResistant to alkalis, wastewater, slurry, biogas, and de-icing salts\u003c\/li\u003e\n\u003cli data-section-id=\"jbm81n\" data-start=\"1360\" data-end=\"1398\"\u003eFlexible and malleable consistency\u003c\/li\u003e\n\u003cli data-section-id=\"1lcy1r\" data-start=\"1399\" data-end=\"1417\"\u003eSmooth surface\u003c\/li\u003e\n\u003cli data-section-id=\"1o0wasq\" data-start=\"1418\" data-end=\"1448\"\u003eCE marked and ETA approved\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1450\" data-end=\"1477\"\u003eTechnical Specifications:\u003c\/p\u003e\n\u003cul data-start=\"1478\" data-end=\"1921\"\u003e\n\u003cli data-section-id=\"1h4gsg3\" data-start=\"1478\" data-end=\"1504\"\u003eDimensions: 25 × 20 mm\u003c\/li\u003e\n\u003cli data-section-id=\"1igo306\" data-start=\"1505\" data-end=\"1520\"\u003eLength: 5 m\u003c\/li\u003e\n\u003cli data-section-id=\"1lhvhpr\" data-start=\"1521\" data-end=\"1571\"\u003eMaterial: Sodium bentonite with rubber content\u003c\/li\u003e\n\u003cli data-section-id=\"1dwdh19\" data-start=\"1572\" data-end=\"1589\"\u003eColour: Black\u003c\/li\u003e\n\u003cli data-section-id=\"c6wl9i\" data-start=\"1590\" data-end=\"1613\"\u003eDensity: 1.53 g\/cm³\u003c\/li\u003e\n\u003cli data-section-id=\"wpem08\" data-start=\"1614\" data-end=\"1662\"\u003eExpansion in normal water (pH 7): up to 340%\u003c\/li\u003e\n\u003cli data-section-id=\"y10ui8\" data-start=\"1663\" data-end=\"1710\"\u003eExpansion in aggressive liquids: up to 150%\u003c\/li\u003e\n\u003cli data-section-id=\"eoe09m\" data-start=\"1711\" data-end=\"1756\"\u003eExpansion in alkaline liquids: up to 290%\u003c\/li\u003e\n\u003cli data-section-id=\"1esatud\" data-start=\"1757\" data-end=\"1798\"\u003eWater pressure tightness: up to 5 bar\u003c\/li\u003e\n\u003cli data-section-id=\"mojmqz\" data-start=\"1799\" data-end=\"1846\"\u003eThermal application range: -30 °C to +90 °C\u003c\/li\u003e\n\u003cli data-section-id=\"1jd41nb\" data-start=\"1847\" data-end=\"1921\"\u003eProtective film dissolution: approx. 6–7 days after concrete placement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1923\" data-end=\"1952\"\u003eCertifications \u0026amp; Approvals:\u003c\/p\u003e\n\u003cul data-start=\"1953\" data-end=\"2081\"\u003e\n\u003cli data-section-id=\"1g63b22\" data-start=\"1953\" data-end=\"1966\"\u003eCE marked\u003c\/li\u003e\n\u003cli data-section-id=\"tqhv24\" data-start=\"1967\" data-end=\"1982\"\u003eETA-16\/0735\u003c\/li\u003e\n\u003cli data-section-id=\"bkeron\" data-start=\"1983\" data-end=\"2022\"\u003eabP test certificate (MFPA Leipzig)\u003c\/li\u003e\n\u003cli data-section-id=\"1hnws3c\" data-start=\"2023\" data-end=\"2081\"\u003eSuitable for utility class A according to WU guideline\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2083\" data-end=\"2105\"\u003eApplication \u0026amp; Usage:\u003c\/p\u003e\n\u003cp data-start=\"2107\" data-end=\"2260\"\u003eMASTERSTOP LONG TIME is used for waterproof sealing of construction joints in concrete structures where protection against water penetration is required.\u003c\/p\u003e\n\u003cp data-start=\"2262\" data-end=\"2277\"\u003eSuitable for:\u003c\/p\u003e\n\u003cul data-start=\"2278\" data-end=\"2473\"\u003e\n\u003cli data-section-id=\"10ajnrk\" data-start=\"2278\" data-end=\"2301\"\u003eConstruction joints\u003c\/li\u003e\n\u003cli data-section-id=\"18ldedg\" data-start=\"2302\" data-end=\"2337\"\u003eUnderground concrete structures\u003c\/li\u003e\n\u003cli data-section-id=\"1gnlc3x\" data-start=\"2338\" data-end=\"2364\"\u003eWater treatment plants\u003c\/li\u003e\n\u003cli data-section-id=\"1friwq7\" data-start=\"2365\" data-end=\"2394\"\u003eFoundations and basements\u003c\/li\u003e\n\u003cli data-section-id=\"18nf1y6\" data-start=\"2395\" data-end=\"2441\"\u003eInfrastructure and industrial construction\u003c\/li\u003e\n\u003cli data-section-id=\"hwmrmw\" data-start=\"2442\" data-end=\"2473\"\u003eWaterproof concrete systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2475\" data-end=\"2496\"\u003eUsage Instructions:\u003c\/p\u003e\n\u003cp data-start=\"2498\" data-end=\"2716\"\u003eInstall the swelling tape onto a clean and stable substrate before concrete pouring. Ensure proper positioning within the construction joint. Protect the product from premature water exposure before concrete placement.\u003c\/p\u003e\n\u003cp data-start=\"2718\" data-end=\"2741\"\u003eStorage Instructions:\u003c\/p\u003e\n\u003cp data-start=\"2743\" data-end=\"2881\"\u003eStore in a cool and well-ventilated room with recommended humidity of at least 65%. Protect from frost, direct sunlight, and heat sources.\u003c\/p\u003e","brand":"Mastertec","offers":[{"title":"Default Title","offer_id":58034741150041,"sku":"MASTER-010012","price":0.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0923\/0997\/9481\/files\/010012-MASTERSTOP-LONG-TIME-2026_R2.86cca24a.jpg?v=1778494166"}],"url":"https:\/\/ottensten.lv\/en\/collections\/bentonite-waterstops-for-concrete-joint-waterproofing.oembed","provider":"Ottensten","version":"1.0","type":"link"}