{"product_id":"dowsil-791-silcone-weatherproofing-sealant","title":"Dowsil 791 Silicone Weatherproofing Sealant","description":"\u003cdiv class=\"tldr-box\" style=\"background: #f0f4f8; border-left: 4px solid #2c5282; padding: 16px; margin-bottom: 24px;\"\u003e\u003cstrong\u003eSummary:\u003c\/strong\u003e\u003cp\u003eDowsil 791 (formerly Dow Corning 791 \/ Dow 791) is one of the world's most widely used building sealants. A neutral-cure silicone formula with high joint movement capability and outstanding weatherability, suitable for curtain wall glazing, window\/door joints, and exterior waterproofing. Known in Hong Kong's construction industry as '791 silicone' or '791 sealant'.\u003c\/p\u003e\u003c\/div\u003e\u003ch2\u003eProduct Features\u003c\/h2\u003e\u003cp\u003eDowsil 791 (also known as Dow 791) is a one-component, medium-modulus, neutral-cure silicone elastic sealant designed for building weatherproofing applications. Once cured, it forms a flexible and durable silicone rubber seal that provides long-lasting waterproof protection. Available in multiple colours to match various architectural finishes. As the world's best-selling 791 silicone, Dowsil 791 is widely specified across Hong Kong's construction industry.\u003c\/p\u003e\u003cul\u003e\u003cli\u003eReady to use straight from the cartridge\u003c\/li\u003e\u003cli\u003eMedium modulus with high joint movement capability\u003c\/li\u003e\u003cli\u003eOutstanding weatherability — virtually unaffected by sunlight, rain, or ozone\u003c\/li\u003e\u003cli\u003eNeutral cure — non-corrosive to metals, concrete, stone, and other substrates\u003c\/li\u003e\u003cli\u003eLow odour for a healthier working environment\u003c\/li\u003e\u003cli\u003eLow embodied carbon — carbon-neutral certification available (PAS 2060)\u003c\/li\u003e\u003cli\u003eContributes to green building certification credits\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eApplications\u003c\/h2\u003e\u003cul\u003e\u003cli\u003eCurtain wall weatherproofing joints\u003c\/li\u003e\u003cli\u003eExterior building facade waterproofing\u003c\/li\u003e\u003cli\u003eWindow and door frame sealing\u003c\/li\u003e\u003cli\u003eGeneral building waterproofing\u003c\/li\u003e\u003cli\u003eMetal cladding panel joint sealing\u003c\/li\u003e\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003cthead\u003e\u003ctr\u003e\u003cth\u003eItem\u003c\/th\u003e\u003cth\u003eSpecification\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd\u003eType\u003c\/td\u003e\u003ctd\u003eOne-component neutral-cure silicone sealant\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003ctd\u003eModulus\u003c\/td\u003e\u003ctd\u003eMedium\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003ctd\u003eMovement capability\u003c\/td\u003e\u003ctd\u003eHigh\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003ctd\u003eCure type\u003c\/td\u003e\u003ctd\u003eNeutral cure (moisture cure)\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003ctd\u003ePackaging\u003c\/td\u003e\u003ctd\u003e300ml cartridge\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003ctd\u003eColour\u003c\/td\u003e\u003ctd\u003eMultiple colours available\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\u003ch2\u003eDowsil 791 vs 795 vs 995 Comparison\u003c\/h2\u003e\u003ctable\u003e\u003cthead\u003e\u003ctr\u003e\u003cth\u003eModel\u003c\/th\u003e\u003cth\u003eApplication\u003c\/th\u003e\u003cth\u003eModulus\u003c\/th\u003e\u003cth\u003eFeatures\u003c\/th\u003e\u003c\/tr\u003e\u003c\/thead\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eDowsil 791\u003c\/strong\u003e\u003c\/td\u003e\u003ctd\u003eExterior weatherproofing\u003c\/td\u003e\u003ctd\u003eMedium\u003c\/td\u003e\u003ctd\u003eMost versatile, suits most building sealing\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003ctd\u003eDowsil 795\u003c\/td\u003e\u003ctd\u003eStructural bonding\u003c\/td\u003e\u003ctd\u003eMedium\u003c\/td\u003e\u003ctd\u003eCan withstand wind loads, supports glass panels\u003c\/td\u003e\u003c\/tr\u003e\u003ctr\u003e\u003ctd\u003eDowsil 995\u003c\/td\u003e\u003ctd\u003eStructural curtain wall\u003c\/td\u003e\u003ctd\u003eHigh\u003c\/td\u003e\u003ctd\u003eHurricane-rated structural sealant, high mechanical strength\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\u003cp\u003eIn short: 791 for weatherproofing, 795 for structural sealing, 995 for demanding structural bonding. Most exterior building waterproofing projects use 791 silicone.\u003c\/p\u003e\u003ch2\u003eFAQ\u003c\/h2\u003e\u003ch3\u003eWhat is the difference between Dowsil 791 and Dow Corning 791?\u003c\/h3\u003e\u003cp\u003eThey are the same product. Dow Corning rebranded to DOWSIL in 2018; the formulation remains unchanged. Searching for Dow Corning 791 or Dow 791 will lead to Dowsil 791.\u003c\/p\u003e\u003ch3\u003eWhat applications suit 791 silicone?\u003c\/h3\u003e\u003cp\u003eDowsil 791 is ideal for exterior walls, curtain wall glazing, and window\/door frame weatherproofing. Its high movement capability accommodates thermal expansion and contraction, the neutral cure does not corrode substrates, and its weatherability provides long-lasting durable performance.\u003c\/p\u003e\u003ch3\u003eShould I choose 791 or 795?\u003c\/h3\u003e\u003cp\u003eFor general weatherproofing, use 791. For structural bonding (e.g. fixing glass panels to withstand wind loads), use 795. Dowsil 791 is more affordable, has a broader application range, and is the most commonly used building silicone sealant.\u003c\/p\u003e\u003ch3\u003eWhy is 791 so popular?\u003c\/h3\u003e\u003cp\u003eDowsil 791 (Dow 791) has decades of proven market performance, a neutral-cure formula that does not corrode substrates, and high movement capability to accommodate structural movement. It is used on major building projects worldwide and remains the construction industry's go-to weatherproofing silicone.\u003c\/p\u003e\u003ch3\u003ePricing\u003c\/h3\u003e\u003cp\u003eContact us via WhatsApp for current pricing. We offer counter collection from our Mong Kok store and delivery throughout Hong Kong.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eFor detailed application methods, coverage rates, and technical parameters, please refer to the official product data sheet.\u003c\/em\u003e\u003c\/p\u003e","brand":"DOWSIL","offers":[{"title":"黑 Black","offer_id":43686333153430,"sku":"","price":1.0,"currency_code":"HKD","in_stock":true},{"title":"灰 Grey","offer_id":43686333186198,"sku":"","price":1.0,"currency_code":"HKD","in_stock":true},{"title":"金屬灰 Metal Grey","offer_id":43686333218966,"sku":"","price":1.0,"currency_code":"HKD","in_stock":true},{"title":"深灰 Dark Grey","offer_id":43686333251734,"sku":"","price":1.0,"currency_code":"HKD","in_stock":true},{"title":"石灰岩 Limestone","offer_id":43686333284502,"sku":"","price":1.0,"currency_code":"HKD","in_stock":true},{"title":"白 White","offer_id":43686333317270,"sku":"","price":1.0,"currency_code":"HKD","in_stock":true},{"title":"古銅 Bronze","offer_id":43686333350038,"sku":"","price":1.0,"currency_code":"HKD","in_stock":true},{"title":"瓷白 Precast White","offer_id":43686333382806,"sku":"","price":1.0,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/9027\/1382\/files\/Dowsil_791_Silcone_Weatherproofing_Sealant.png?v=1754554483","url":"https:\/\/wahhingwp.com\/en\/products\/dowsil-791-silcone-weatherproofing-sealant","provider":"華興建築防水材料有限公司","version":"1.0","type":"link"}