{"product_id":"akfix-840-fire-block-spray-foam-fire-resistant-expanding-foam","title":"Akfix 840 Fire Block Spray Foam - Fire Resistant Expanding Foam","description":"\u003cp\u003eIn this review the Akfix 840 Fire Block Spray Foam is examined as a practical option for builders, remodelers and home DIYers who need a fire-rated sealant for gaps and penetrations. The single biggest reason to consider it is its Class A fire rating and fire-retardant formulation, which provide an added layer of protection around windows, doors and service penetrations. The reviewer found it useful for large-cavity filling and long-term adhesion, while noting there are tradeoffs in spray handling that affect ease of application.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFire-Resistant Foam:\u003c\/strong\u003e Designed to slow flame spread and add protection to residential and commercial openings where fire resistance matters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Expansion:\u003c\/strong\u003e Expands significantly after application to fill large gaps and cavities, reducing the number of cans needed for wide voids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong Bonding:\u003c\/strong\u003e Adheres well to common materials such as wood, concrete and metal for long-lasting seals around frames and penetrations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePaintable Finish:\u003c\/strong\u003e Cured foam can be painted or coated to improve UV resistance and blend with exterior or interior surfaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClass A Fire Rated:\u003c\/strong\u003e UL-certified and ICC-approved for enhanced safety in both residential and commercial installations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis product is aimed at professionals and competent DIYers who need a fire-rated polyurethane foam for sealing around windows, doors, pipes and electrical fixtures. It is especially useful when a high-expansion material is needed to fill deep voids quickly and when a paintable finish is desired for final appearance.\u003c\/p\u003e\n\u003cp\u003eThose who prefer very precise bead control or who are inexperienced with low-flow spray foams should consider alternatives or practice first, because some users report variability in sprayability and handling that can make neat application more challenging.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eClass A fire rating offers genuine fire-blocking benefits in key installations.\u003c\/li\u003e\n\u003cli\u003eHigh expansion reduces material waste by filling large cavities effectively.\u003c\/li\u003e\n\u003cli\u003eStrong adhesion to wood, concrete and metal supports durable seals.\u003c\/li\u003e\n\u003cli\u003ePaintable once cured, allowing UV protection and aesthetic finishing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSprayability is inconsistent for some users, making application harder than expected.\u003c\/li\u003e\n\u003cli\u003eMixed feedback on ease of use and perceived value means it may require skill to get the best results.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct\u003c\/td\u003e\n\u003ctd\u003eFire block spray foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackaging\u003c\/td\u003e\n\u003ctd\u003e12 cans per pack, 12 oz each\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFire rating\u003c\/td\u003e\n\u003ctd\u003eClass A (UL-certified, ICC-approved)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColor\u003c\/td\u003e\n\u003ctd\u003eOrange\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMain material\u003c\/td\u003e\n\u003ctd\u003ePolyurethane expanding foam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eGap filling, insulation and sealing around windows, doors and penetrations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe Akfix 840 Fire Block Spray Foam is a solid choice when fire resistance and high expansion are priorities; it bonds well to common building materials and accepts paint after curing. Professionals and experienced DIYers who can manage its spray characteristics will find it good value for sealing large gaps and increasing fire safety, while novice users may want to practice to avoid messy application.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this foam paintable?\u003c\/strong\u003e\u003cbr\u003eYes. Once fully cured the foam can be painted or coated to improve UV resistance and appearance.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used around electrical fixtures?\u003c\/strong\u003e\u003cbr\u003eYes. It is designed for sealing around electrical fixtures and pipe inlets, but follow local codes for firestopping details.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many cans are included?\u003c\/strong\u003e\u003cbr\u003eThe product is supplied as a 12-pack of 12 oz cans for larger projects and repeated use.\u003c\/p\u003e","brand":"Akfix","offers":[{"title":"Default Title","offer_id":48237345276123,"sku":"B0CZLJ4BYV","price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71XqWWYDC1L._SL1500.jpg?v=1770788666","url":"https:\/\/gearmusthave.com\/products\/akfix-840-fire-block-spray-foam-fire-resistant-expanding-foam","provider":"GearMustHave","version":"1.0","type":"link"}