The CPVC in CPVC clamps refers to a chlorinated polyvinyl chloride (PVC) material. Through the chlorination process, CPVC increases its heat resistance, chemical resistance, and mechanical properties, giving it an advantage over regular PVC in many applications. 

Therefore, CPVC straps are specifically designed to be compatible with CPVC pipes without causing damage to the pipe material. CPVC clamps can withstand the high-temperature operating conditions of CPVC piping systems without deformation or failure due to high temperatures.