Nullifire FS702 Intumastic Fire Resistant Acrylic Sealant is a water-based acrylic sealant which cures to a firm but flexible fire seal. Suitable for use in various construction joints offering up to 30% movement within the joint whilst providing an excellent acoustic and air seal. Our excellent formulation also incorporates a unique identification property offering architects, specifiers, main contractors, and applicators guaranteed traceability of product on-site. Optifire technology is activated by exposing the product's surface to a UV light source, which offers easy and instant product identification. Nullifire FS702 Intumastic also features Optifire+ visible with a Nullifire detector offering lifetime identification, even after a fire. Recommended areas of use Static and movement linear joints (masonry, flexible wall to masonry, rigid walls or floors and flexible floors) Window and door joints (masonry to timber/steel) Use with FB750 to flexible or rigid walls or rigid floors