Ultrasonic Welding (USW) is the method of joining two parts by converting electrical energy into heat energy by high-frequency mechanical vibration, this is suitable for plastics or metals. One part of the assembly is set in motion in order to cause intense friction between the two pieces, one of which remains held in place. This movement is provided by a vibrating component called a sonotrode which is applied at right angles to the surface of the part to be welded. Friction is localized at the interface of the assembly. The resulting heat quickly melts the plastic which flows and causes a chemical bond. After it has cooled, a solid homogeneous weld between the two components is formed. The vibration frequency of the sonotrode is 20 to 40 kHz which is outside the perception limit of the human ear. Not only does Matter have superior urethane, but we also understand the importance of making the urethane and core work coherently in order to optimize roll, grip, wear, and overall performance for indoor, road, track, and marathon racing.
The Matter CHR core has been engineered to offer a more comfortable ride quality without sacrificing rolling performance. The CHR-core is based on Matters' famous Hollow Core Technology (HCT). Thanks to the cutouts in the core the wheel benefits from lower weight and added flex for more pop at each stride thus overall improved performance and makes it easier to skate and get the edges nicely.