Apparent d. and tensile strength at break were examd. in LDPE foamed in a Plasticorder PLV 151 with 2, 3, or 4 wt.% of (a) Hydrocerol BIH 70 alone or doped with 0.8% of Zn stearate; (b) Polybatch U8850E, and extruded from a 19-mm 36D single screw at (a) 130-140-200-125degreesC and (b) 140-195-125degreesC, head temp. 110degreesC, at 60, 75, 100, or 120 rpm. With 3% of BIH 70 and 0.8% of Zn stearate (or with 4% of BIH alone) at 75 rpm, the d. and the tensile strength fell to a min. of 0.38 g/cm(3) and 2.55 MPa, resp.