Considering that abrasive wheels increase their performances with the increase of their peripheral speed, and considering that with organic resinoid binders only, it is impossible to obtain enough resistance to centrifugal forces (peripheral speed in the order of 80-100 m/s) and to different mechanical stresses, fiberglass reinforcements, soaked with resols and partially polymerized, become part of the wheel structure.
Thanks to these reinforcements, it is possible to obtain a structure properly reinforced, able to support high stresses and to reach the required safety values. Reinforcements are different: characterized by the weight/m2 of canvas, by the type and weight of yarn (twisted or flat), by the mesh width, by the type and quantity of impregnation (a factor that guarantees adhesion to the mixture, composing the wheel).
Obviously, for higher peripheral speeds and stricter uses, heaver fiberglass reinforcements and in greater numbers will have to be used. Reinforcements can be applied on the sides and/or inside the disc, but for applications like laboratory discs for cutting test pieces, reinforcements are not used and considering that the wheel is fragile, safety is entrusted to the full enclosure of the machine.
Yarn resistance test of fiberglass reinforcements.
Fiberglass reinforcements: some types of reinforcements of GLOBE wheels.
