A lightweight printing paper made with a
substantial proportion of mechanical wood pulp.
The balance of the pulp is usually unbleached
sulfite or semi-bleached sulfate pulp, although
the paper is also made from deinked paper stock
plus chemical wood pulp. Its essential
characteristics are uniformity of basis weight.
opacity, strength, and a finish suitable for high
speed printing. Permanence is not considered to be
an essential property. Usual basis weights are 18
to 28 pounds (4 x 36). It is used main1y
for printing telephone directories, city
directories, and the like. (17 )