A secondary spin of the old revolving door has swept a group of former government experts on health standards out of one private firm into another.

Among the founders of a new corporation called Environ--with a nifty little bar over the "i" that isn't reproduceable in mere newsprint--are four former employes of Clement Associates Inc. of Washington which, like Environ, specializes in assessing toxic-substance hazards and helping companies devise programs to reduce the risk to human and environmental well-being.

Three of the four came to Clement from the halls of government--Grover C. Wrenn, a former director of health standards for the Occupational Safety and Health Administration; Joseph V. Rodricks, former health affairs official with the Food and Drug Administration, and Robert M. Wenger, former counsel for a Senate subcommittee on health and scientific research. They'll be joined in the Washington office by William A. Lowenbach, also of Clement Associates.

Environ has also opened an office at Princeton, N.J., which will be run by two co-directors of the Princeton Hazardous Waste Project, Joseph H. Highland and Robert H. Harris. Harris was a former member of the Council on Environmental Quality.

Clements Associates has already started filling its empty desks, recently snagging two Environmental Protection Agency bureaucrats, including the director of EPA's office of solid waste.