Cambria is a non-porous, 93% natural quartz surface. Since it is non-porous, moisture cannot penetrate the surface leaving harmful bacteria. Cambria never needs to be sealed, polished or reconditioned. Simply wash with warm water. Unlike granite, Cambria will resist stains from common food items such as wine and coffee. Cambria is certified by NSF (National Science Foundation) as a safe food preparation surface, meaning that it does not emit harmful chemicals into the air.