{"product_id":"3m-fire-barrier-sealant-cp-25wb-intumescent-firestop-sealant","title":"3M Fire Barrier Sealant CP 25WB+ - Intumescent Firestop Sealant","description":"\u003cp\u003eIn this review the 3M Fire Barrier Sealant CP 25WB+ is evaluated for contractors, facility managers and serious DIYers who need a reliable, code-compliant firestop sealant. The bottom line: it is a one-component, latex-based intumescent sealant that makes firestopping straightforward and effective, with the single biggest reason to buy being its ability to expand when exposed to high heat and maintain a fire penetration seal for up to 4 hours. This review focuses on real-world use, ease of application, and how well it meets building code needs.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilding code compliance:\u003c\/strong\u003e Designed to seal openings through fire barriers where mechanical services pass, helping projects meet listed through-penetration systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntumescent expansion:\u003c\/strong\u003e Capable of expanding a minimum of three times its dried volume when exposed to temperatures above 1000F, which helps maintain the integrity of a penetration seal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultiple UL systems:\u003c\/strong\u003e Listed in hundreds of UL Firestop systems with up to 4-hour ratings, providing flexibility across wall, floor and floor-ceiling assemblies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVersatile applications:\u003c\/strong\u003e Works on HVAC ducts and vents, pipes, blank openings, cables and busways, making it practical across commercial, industrial and residential jobs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy application:\u003c\/strong\u003e One-component, sag-resistant formula that applies from a cartridge with no mixing required and cleans up with water when fresh.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis sealant is best for electricians, plumbers, HVAC installers, general contractors and maintenance teams who need a proven firestop material that integrates with established UL systems. It suits projects where rated penetrations must be maintained and where a latex-based, non-sag product simplifies on-site work.\u003c\/p\u003e\n\u003cp\u003eIt is less suited for cosmetic visible beads where a perfectly smooth finish is required without sanding or for users who insist on solvent-based sealants for specialty substrates; anyone uncertain about listed system requirements should consult a firestop engineer or follow a specific UL assembly prior to installation.\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\u003eEasy to apply from a cartridge and compatible with a standard caulking gun for faster installation.\u003c\/li\u003e\n\u003cli\u003eAdheres well to common substrates such as drywall and many plastics, giving a dependable bond at penetrations.\u003c\/li\u003e\n\u003cli\u003eProvides both fire and smoke control, expanding under heat to maintain a seal during a fire event.\u003c\/li\u003e\n\u003cli\u003eListed in many UL systems and rated up to 4 hours, which simplifies specifying for rated assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eCan be messy during application and cleanup requires prompt water washing while fresh to avoid hardened residue.\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\u003e3M Fire Barrier Sealant CP 25WB+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVolume per cartridge\u003c\/td\u003e\n\u003ctd\u003e10.1 fluid ounces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003ePack of 12 cartridges\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003ctd\u003eOne-component latex-based intumescent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFire rating\u003c\/td\u003e\n\u003ctd\u003eListed in UL systems up to 4 hours\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExpansion\u003c\/td\u003e\n\u003ctd\u003eExpands minimum 3x dried volume above 1000F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eHVAC, pipes, cables, blank openings, through-penetrations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 3M CP 25WB+ is a practical, code-oriented intumescent sealant for professionals who need a reliable firestop that is easy to apply and listed in many UL systems. Its expanding capability and water-cleanup while fresh make it a good value for commercial, industrial and residential projects that require rated penetrations, provided installers accept some mess during application.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIs this sealant suitable for both walls and floors?\u003c\/strong\u003e\u003cbr\u003eYes. It is used in rated wall, floor and floor-ceiling assemblies and is listed in through-penetration systems for those applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long does the firestop rating last once installed?\u003c\/strong\u003e\u003cbr\u003eWhen installed per a listed system this sealant contributes to firestop solutions with ratings up to 4 hours.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the product be cleaned up easily?\u003c\/strong\u003e\u003cbr\u003eCleanup is straightforward with water while the sealant is fresh, but it becomes difficult to remove once cured.\u003c\/p\u003e","brand":"3M","offers":[{"title":"Default Title","offer_id":48601454477531,"sku":"B08SQ5TG92","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71KDzqVirZL._AC_SL1500.jpg?v=1778387699","url":"https:\/\/gearmusthave.com\/products\/3m-fire-barrier-sealant-cp-25wb-intumescent-firestop-sealant","provider":"GearMustHave","version":"1.0","type":"link"}