{"product_id":"sika-西卡","title":"Sika Sikalastic 680","description":"\u003chr\u003e\n\u003ch2\u003eSikalastic 680 — Single Component Polyurethane Waterproofing Membrane\u003c\/h2\u003e\n\u003cp\u003eSikalastic®-680 is a single-component, highly elastic polyurethane liquid-applied waterproofing membrane for concrete structures. It forms a continuous, seamless waterproof layer and must be covered by protective toppings (screed, tiles, or ballast). Commonly known in Hong Kong as \"rooftop waterproofing black glue\" (天台防水黑膠).\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle component — ready to use, no mixing required\u003c\/li\u003e\n\u003cli\u003eHigh elasticity — elongation at break \u003e 500%\u003c\/li\u003e\n\u003cli\u003eQuick drying — tack free in approximately 4 hours (25°C \/ 75% RH)\u003c\/li\u003e\n\u003cli\u003eExcellent adhesion to concrete, render, and masonry (\u003e 1 MPa)\u003c\/li\u003e\n\u003cli\u003eGood impact and abrasion resistance\u003c\/li\u003e\n\u003cli\u003eLow odour, non-toxic\u003c\/li\u003e\n\u003cli\u003eLow temperature flexibility\u003c\/li\u003e\n\u003cli\u003eMultiple application methods: brush, roller, trowel, squeegee, or airless spray\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRoofs, podiums, balconies (covered by protective toppings)\u003c\/li\u003e\n\u003cli\u003eBathrooms, pools, tanks, green roofs, and planters\u003c\/li\u003e\n\u003cli\u003eExternal walls, basements, and foundations\u003c\/li\u003e\n\u003cli\u003eAs water barrier under plasters, screeds, or tiles\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Sikalastic®-680 is designed for non-exposed use. A protective covering layer must be applied over the finished membrane.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\u003cth\u003eProperty\u003c\/th\u003e\u003cth\u003eValue\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eChemical Base\u003c\/td\u003e\u003ctd\u003ePolyurethane\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eComponents\u003c\/td\u003e\u003ctd\u003eSingle component, ready to use\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eColour\u003c\/td\u003e\u003ctd\u003eBlack, grey\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eDensity\u003c\/td\u003e\u003ctd\u003e~1.5 kg\/L (± 0.05)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eShore A Hardness\u003c\/td\u003e\u003ctd\u003e60 (± 5)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eTensile Strength\u003c\/td\u003e\u003ctd\u003e~2 MPa\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eElongation at Break\u003c\/td\u003e\u003ctd\u003e\u003e 500%\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eTensile Adhesion Strength\u003c\/td\u003e\u003ctd\u003e\u003e 1 MPa\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eTear Strength\u003c\/td\u003e\u003ctd\u003e~15 N\/mm\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eYield (Standard)\u003c\/td\u003e\u003ctd\u003e~2.0 kg\/m² (~1.3 mm wet film), one or more coats\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eYield (Reinforced)\u003c\/td\u003e\u003ctd\u003e~2.5 kg\/m² (~1.6–1.7 mm wet film), with Sika® Glass Fabric\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eTack Free Time\u003c\/td\u003e\u003ctd\u003e~4 hours (25°C, 75% RH)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eAmbient Temperature\u003c\/td\u003e\u003ctd\u003e+5°C to +40°C\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eVOC Content\u003c\/td\u003e\u003ctd\u003e≤ 250 gm\/L (HK Air Pollution Control — Roof coatings, non-exposed)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003ePackaging\u003c\/td\u003e\u003ctd\u003e20 kg pail\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eShelf Life\u003c\/td\u003e\u003ctd\u003e9 months from date of production\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eStorage\u003c\/td\u003e\u003ctd\u003eUnopened, cool and dry, away from sunlight and frost\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eProduct Comparison\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eProduct\u003c\/th\u003e\n\u003cth\u003eType\u003c\/th\u003e\n\u003cth\u003eExposed Use\u003c\/th\u003e\n\u003cth\u003eElasticity\u003c\/th\u003e\n\u003cth\u003eBest For\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSikalastic 680\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePolyurethane\u003c\/td\u003e\n\u003ctd\u003eMust be covered\u003c\/td\u003e\n\u003ctd\u003eHigh (\u003e 500%)\u003c\/td\u003e\n\u003ctd\u003eRoofs \/ basements \/ pools — under tiles or screed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSikaFill C\u003c\/td\u003e\n\u003ctd\u003eAcrylic\u003c\/td\u003e\n\u003ctd\u003eCan be exposed\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003ctd\u003eVillage rooftops \/ walls — economical choice\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNitoproof 600PF\u003c\/td\u003e\n\u003ctd\u003ePolyurethane\u003c\/td\u003e\n\u003ctd\u003eMust be covered\u003c\/td\u003e\n\u003ctd\u003eHigh\u003c\/td\u003e\n\u003ctd\u003eLarge projects — requires protective screed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHyperdesmo Classic\u003c\/td\u003e\n\u003ctd\u003ePolyurethane\u003c\/td\u003e\n\u003ctd\u003eCan be exposed\u003c\/td\u003e\n\u003ctd\u003eVery high\u003c\/td\u003e\n\u003ctd\u003ePremium projects — 30-year brand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch3\u003eCan Sikalastic 680 be left exposed?\u003c\/h3\u003e\n\u003cp\u003eNo. According to the product data sheet, Sikalastic®-680 is designed for non-exposed applications and must be covered by a protective layer such as screed, tiles, or ballast. For exposed waterproofing solutions, consider SikaFill C (acrylic) or Hyperdesmo Classic (exposed-grade polyurethane).\u003c\/p\u003e\n\u003ch3\u003eHow long before a flood test can be carried out?\u003c\/h3\u003e\n\u003cp\u003eAllow at least 3 days of drying at 25°C and 75% relative humidity before flood testing. In cooler or more humid conditions, drying time will be longer and the waiting period should be extended accordingly.\u003c\/p\u003e","brand":"Sika 西卡","offers":[{"title":"Default Title","offer_id":45242553270422,"sku":null,"price":1.0,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/9027\/1382\/files\/Sika_Sikalastic_680_Flexible_Waterproofing_Membrane_High_Performance_Polyurethane_Coating.png?v=1760462857","url":"https:\/\/wahhingwp.com\/en\/products\/sika-%e8%a5%bf%e5%8d%a1","provider":"華興建築防水材料有限公司","version":"1.0","type":"link"}