Semi rigid discs are used for roughing and finishing with angle grinders where it is required a high stock removal per unit of time even on very hard or clogging materials
There are at least two types:
- SRP: heavy semirigid disc made up of an abrasive surface of high thickness with "turbo" design, combined with a strong vulcanized fibre. Available in aluminum oxide for use on iron, steel and stainless steel or silicon carbide for use on fibreglass, stone and marble.
You should always use the special pad.
- SRS: similar to SRP but characterized by a strong fibreglass backing that does not require the use of the pad.