The law farm,Slater and Gordon is preparing a class action against bench-top manufacturers with an alarming number of workers developing potentially lung diseases from exposure to silica dust.

Slater and Gordon says companies that make artificial stone have failed to properly warn workers about the severe health risks their products pose and how it must be handled to avoid harm.

They are planning a national class action on behalf of affected workers, with at least 135 stonemasons diagnosed with silicosis in Victoria and Queensland alone.