Abrasive materials selection guide

Choosing the right valve grinding abrasive

Selecting the correct valve grinding abrasives depends on seat material and seat condition. The table below gives recommended grit and abrasive material for brass, stainless steel and stellite seats across three condition levels. For advice on a specific application, contact the LarsLap team.

Seat condition	Step	Brass seat — Grit	Brass seat — Material	Stainless steel seat — Grit	Stainless steel seat — Material	Stellite seat — Grit	Stellite seat — Material
Poor condition
	1	80	Micron alumina	60–80	Diamond, Ceramix	60–80	Diamond, Ceramix
	2	120	Silicon (K), Micron alumina	80	Micron alumina, Ceramix	80	Micron alumina, Ceramix, Diamond
	3	180	Silicon (K), Micron alumina	120	Micron alumina, Ceramix	120	Micron alumina, Ceramix, Diamond
	4	400	Silicon (K), Micron alumina	180	Micron alumina, Ceramix	180	Micron alumina, Ceramix
	5			400	Micron alumina, Ceramix	400	Micron alumina, Ceramix
Normal condition
	1	80	Silicon (K), Micron alumina	80	Micron alumina, Ceramix		Micron alumina, Ceramix, Diamond
	2	120	Silicon (K), Micron alumina	120	Micron alumina, Ceramix		Micron alumina, Ceramix, Diamond
	3	180	Silicon (K), Micron alumina	180	Micron alumina, Ceramix		Micron alumina, Ceramix
	4	400	Silicon (K), Micron alumina	400	Micron alumina, Ceramix		Micron alumina, Ceramix
Good condition
	1	120	Silicon (K), Micron alumina	120	Micron alumina, Ceramix	120	Micron alumina, Ceramix
	2	180	Silicon (K), Micron alumina	180	Micron alumina, Ceramix	180	Micron alumina, Ceramix
	3	400	Silicon (K), Micron alumina	400	Micron alumina, Ceramix	400	Micron alumina, Ceramix

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