{"product_id":"matt-seal-s-350-sanitary-silicone-sealant","title":"Matt Seal S-350 Sanitary Silicone Sealant","description":"\u003cdiv role=\"main\"\u003e\n\u003cp\u003eFor tiled wet areas, kitchens, and bathrooms where a reflective gloss bead would disrupt the design, Matt Seal S-350 Sanitary Silicone Sealant provides a clean, matte finish that resists fungal growth in hot and humid environments. This neutral-curing silicone accommodates high joint movement while protecting joints from mould, making it suitable for both residential bathrooms and demanding commercial installations.\u003c\/p\u003e\n\u003ch3\u003eHow it works\u003c\/h3\u003e\n\u003cp\u003eMatt Seal S-350 is a neutral (oxime) curing silicone formulated with an added fungicide to inhibit mould and biological growth. On exposure to atmospheric humidity, it cures to form a permanently flexible, dustproof, and waterproof joint seal. It is non-corrosive to galvanised steel, zinc-coated steel, and concrete. Because the cured rubber maintains excellent UV stability and colour fastness, it can be used for internal and external seals, including areas under permanent UV exposure.\u003c\/p\u003e\n\u003ch3\u003eNumbers that matter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e±25% movement capability:\u003c\/strong\u003e Accommodates joint contraction and expansion without adhesive or cohesive failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e300% elongation at break (ISO 8339):\u003c\/strong\u003e High stretch capability to maintain joint integrity under stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2mm per day cure rate:\u003c\/strong\u003e Curing speed measured at 25°C and 50% relative humidity; skin forms in approximately 15 to 20 minutes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-50°C to 150°C temperature resistance:\u003c\/strong\u003e Maintains its flexible seal across extreme temperature ranges, making it suitable for steam and spa rooms.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e43g\/L VOC content:\u003c\/strong\u003e Low-odour formula conforming to the Californian Bureau of Air Quality Management Rule 1168 for green building projects.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhere to use it\u003c\/h3\u003e\n\u003cp\u003eMatt Seal S-350 forms a bond across common building substrates, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGlazed and unglazed ceramic tiles, glass, porcelain, and fibreglass\u003c\/li\u003e\n\u003cli\u003eLaminated kitchen benches and timber\u003c\/li\u003e\n\u003cli\u003eAluminium, stainless steel, Colourbond, Zincalume, and galvanised metal\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIt is suitable for joints in shower walls and floors, commercial kitchens, laundries, steam and spa rooms, plumbing and roofing seals, shopfitting, vehicle fabrication, and marine applications. Once cured, it is suitable for below-waterline applications in marine environments.\u003c\/p\u003e\n\u003ch3\u003eLimitations\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDo not use in totally confined spaces:\u003c\/strong\u003e Requires atmospheric humidity to cure; it will not cure without air exposure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for swimming pools:\u003c\/strong\u003e Do not use in underwater applications such as pools or aquariums.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for stone:\u003c\/strong\u003e All stone surfaces require a stain testing program before application to prevent oil migration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for trafficable joints:\u003c\/strong\u003e Do not use on horizontal walkways or trafficable areas.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSubstrate exclusions:\u003c\/strong\u003e Not suitable for structural glazing, polycarbonate sheeting, or adhering mirrors. For mirrors, use Adheseal High Power 609; for composite panels, Adheseal recommends \u003ca href=\"\/products\/adheseal-pu50\"\u003ePU50FC\u003c\/a\u003e subject to testing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal sensitivity:\u003c\/strong\u003e May discolour copper and brass.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-paintable:\u003c\/strong\u003e This silicone cannot be painted over.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eJoint design and installation\u003c\/h3\u003e\n\u003cp\u003eFor optimal movement performance, design joints to a 2:1 width-to-depth ratio. Internal joints require a minimum width and depth of 5mm. External joints require a minimum width of 10mm. The maximum joint width is 30mm, and the maximum depth is 15mm. Use a closed-cell backing rod 25% larger than the joint width for joints deeper than 10mm to prevent three-sided adhesion.\u003c\/p\u003e\n\u003cp\u003eApply the sealant at temperatures between 5°C and 40°C on clean, dry substrates. Ensure concrete has cured for at least 28 days to prevent moisture-driven delamination or mould growth. Use a two-wipe process with \u003ca href=\"\/products\/acetone\"\u003eAcetone\u003c\/a\u003e or 100% White Spirits on non-porous surfaces. Tool the bead with a moistened spatula within 15 minutes before the skin forms, and remove any masking tape while the sealant is still wet.\u003c\/p\u003e\n\u003ch3\u003eSystem components\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupaprime:\u003c\/strong\u003e Recommended primer for porous surfaces in highly stressed joints.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50A Surface Prep:\u003c\/strong\u003e Recommended for non-porous surfaces in highly stressed applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Adheseal","offers":[{"title":"Arctic White \/ Single Buy","offer_id":48690088706240,"sku":"SILADS350ARC\/CTG","price":6.86,"currency_code":"AUD","in_stock":true},{"title":"Arctic White \/ Box Buy (20)","offer_id":48690088739008,"sku":"SILADS350ARC\/CTG\/BOX","price":123.4,"currency_code":"AUD","in_stock":true},{"title":"Ebony \/ Single Buy","offer_id":48690088771776,"sku":"SILADS350EB\/CTG","price":6.86,"currency_code":"AUD","in_stock":true},{"title":"Ebony \/ Box Buy (20)","offer_id":48690088804544,"sku":"SILADS350EB\/CTG\/BOX","price":123.4,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0507\/3630\/0224\/files\/s-350.png?v=1785446336","url":"https:\/\/adheseal.com.au\/products\/matt-seal-s-350-sanitary-silicone-sealant","provider":"Adheseal","version":"1.0","type":"link"}