Until the 1980s, natural felt was the product of choice for glass polishing wheel. Natural wool felt that is felted to density is stable in water, has excellent abrasive carrying properties, and is very forgiving. The downsides of natural felt are the initial expense and they degrade in water – allowing bacterial growth. For further details, click here
https://spartanfelt.com/polishing-wheels-solid-and-spiral-mirror-ri...

https://penzu.com/p/934f8844