The components are made using the latest in belt technology available on a global basis. The "X" in the part number refers to higher load ratings than standard wrapped belts The lower, compression section of the belt is made of highly fiber reinforced, oil and heat resistant, engineered synthetic rubber compound, specifically compounded for excellent wear resistance, cool running, flexibility and has been proven through thousands of hours of testing. The rubber directly surrounding the tensile member cables is also fiber reinforced and compounded for great adhesion to the tensile member cords. The top fabric is a specially woven, synthetic-natural fiber blend.
The notches are engineered to allow the belts to have superior flex characteristics on smaller and larger diameter pulleys. The helically wound tensile cords are specially engineered, twisted, heat and chemically set, polyester material.Testing has proven that the tensile decay properties of Cord are truly World Class. All belts of a given size are manufactured to run interchangeably in a matched set. SPZX, SPAX, SPBX, and SPCX belts are manufactured to fit ISO standard dimension multi-groove pulleys. Belt Angle is approximately 40 degrees The belts are constructed of highly engineered and high performance components The rubber directly surrounding the tensile member cables is also fiber reinforced and compounded for great adhesion to the tensile member cords.