200 u00b0 c with 20 n cm2 it is found that the cross linking enhancer according to the invention curve 10 has an effectiveness greatly improved over the known cross linking enhancer curve 11 table 2______________________________________ gel values mass after irradiation with doseparts 200 dvv x 40 kgy 80 kgy 120 kgy 160 kgy kgy kgy______________________________________ 0 46 56 64 70 74 200tac 0 75 57 65 72 76 80 1501 25 59 72 75 79 82 1201 75 60 72 78 82 84 1001a 1 0 66 74 79 83 85 801 9 70 79 83 84 86 601b 0 4 60 70 74 78 81 1200 8 64 72 78 81 83 901 2 67 76 80 83 85 802 0 69 80 83 84 86 602a 1 7 72 80 84 86 86 502b 1 0 63 74 79 81 84 801 7 66 76 80 82 84 703 2 4 64 74 76 82 84 804 2 9 63 73 76 80 82 905 2 9 63 71 74 79 81 1206 2 0 66 74 80 82 83 802 4 67 75 81 83 84 707 1 0 60 67 73 77 79 1202 0 66 74 80 82 83 80______________________________________ a selected amount in mass parts of high pressure polyethylene ldpe the selected amount is 100 minus x y wherein x and y are the selected values for enhancer and peroxide given in table 3 d 0 918 g cm 3 mfi 190 2 0 2 are filled together with a selected amount x in mass parts of a cross linking enhancer and a selected amount y in mass parts of the peroxide 1 3.