htpb (hydroxyl terminated polybutadiene) bfunzjonalità ta hydroxyl li hija ugwali jew aktar minn 22 u ugwali jew inqas minn 24 valur talhydroxyl ta inqas minn 077 meq/g u bviskożità f30 °ċ ta inqas minn 47 poise (cas 69102905)