pf777Alkyl functionalized based on Sillitin Z 86. Aktisil PF 777 offers hher rheological activity and improved bonding properties and in addition the product is hydrophobic.AKTISIL PF 777 is a SILLITIN Z 86 coated with alkyle silane. Brand: AKTISIL Functions: Filler, Pment. Chemical Family: Calcium Salts, Silicon-based Compounds. Compatible Polymers &