Generic Concrete Products With Portland Cement

Quikrete material safety data sheet page 2 quikrete dry packaged portland cement based products series 1 msds j other limits niosh has recommended that the permissible exposure limit be changed to 50 micrograms respirable free silica per cubic meter of air 50 ugm3 averaged over a work shift of up to 10 hours per day, 40 hours per week.