Provided is a microporous material including (a) a polyolefin matrix which contains ultrahigh molecular weight polyolefin having a molecular weight greater than 7 million grams per mole and 30 to 80 weight percent high density polyolefin, (b) finely divided particulate filler having a density ranging from 2.21 to 3.21 grams per cubic centimeter distributed throughout the matrix, and (c) at least 35 percent by volume of a network of interconnecting pores communicating throughout the microporous material. The microporous material has a density ranging from 0.6 to 0.9 g/cc, a Sheffield smoothness of less than or equal to 40, and an air flow rate of 1000 or more Gurley seconds. Printed electronic devices prepared from and methods of making the microporous material also are provided.