Laminated microporous article

As an article of manufacture, a laminated microporous article combination comprising a first layer of microporous material, wherein the micropores are substantially all of a size of about 2 microns and less and a layer thickness of 2 mils and greater and a second layer of porous backing material laminated to said first layer, said second layer comprising a heat-bonded fibrous polyester non-woven web of a thickness of about 8 mils and greater and an electrical resistance, in a battery acid electrolyte, of about 0.25 m.OMEGA. in.sup.2 /mil, said laminate having a total thickness of about 10 to 40 mils for a backweb of a microporous layer and said backing material, said non-woven web having a grab breaking strength of 20 to 30 lbs. in machine direction and 12 to 18 lbs in cross direction, a grab breaking elongation, from 25 to 50 percent in machine direction and 50 to 120 percent in cross direction, with a Mullen burst value of 30 to 40 lbs.