Polyfam 748

Characteristics
Polyfam 748 is a non-plasticized aqueous dispersion based on acrylic and methacrylic acid esters.

Recommended Application Areas
Elastomeric roof coatings
Flexible coatings
Crack-bridging systems

Applications
Polyfam 748 is mainly used to produce a variety of superior, 100 percent acrylic-based products specifically for use in protective elastomeric roof coatings. These coatings can be easily applied over various roofing substrates including aged built-up, polyurethane foam, galvanized steel, or cured concrete.
The benefits of formulating with Polyfam 748 are superior exterior durability and UV light resistance, high tensile strength and elongation, as well as improved hail resistance and coating toughness to resist foot traffic and routine maintenance activities on the roof.
Its low toxicity and odour, simple water clean-up and ease of application by spray, brush or roller, results in low installation costs and facilitates handling both for contractors and manufacturers.  
In addition Polyfam 748 combines the inherent flexibility of pliable, low Tg polymers with long term resistance to dirt pickup. Without dirt pickup resistance, the roof coating would quickly darken with age. Due to dark materials’ tendency to absorb heat, dirt pickup can significantly increase roof surface temperatures, which in turn increases interior temperatures and energy costs. However, coatings based on Polyfam 748 resist dirt pickup and retain their white, reflective appearance longer than typical elastomeric coatings, thereby prolonging roof life and life time reduction of interior temperatures and air conditioning costs.
Formulations based on Polyfam 748 have long term low-temperature flexibility, as well as an excellent wet and dry adhesion to a variety of substrates including different grades of PU foams (low and high density). They can also withstand a 180° Mandrel flexibility bend test at -25°C without breaking and cracking to accommodate thermal expansions and contractions of the substrates. Since there is no plasticizer to migrate from the system, this flexibility is retained over time. Long-term resistance to cracking can extend the life of the roof.