earlier described the surfactants were used in the formulation described above to produce polyurethane foams the cured foams were examined to determine if the surfactants produced any splits the results are shown in table 1 table 1______________________________________foam splits as a function of x y x y splits______________________________________ 12 9 yes 13 3 some splits 14 0 none 17 4 none 17 8 none______________________________________ the data in the foregoing table shows that the polyethers of the present invention do not produce foam with splits where the ratio of x y groups is greater than 13 3 in polyethers having an x y ratio of 13 3 or less splits occur in the resulting foams polyurethane foams were made in accordance with the procedures in example i using the following silicone surfactants surfactant a is a silicone surfactant having a degree of polymerization 34 dp 34 of 220 a target d to d 39 ratio of 11 a ratio of ethylene oxide to propylene oxide groups 34 eo po 34 of 24 24 and a c o ch 3 group terminating the eo po pendant the surfactant was diluted 50 in dowanal eph available from the dow chemical corporation midland mich surfactant b is a silicone surfactant of the present invention having a dp of 99 a target d to d 39 ratio of 14 an eo po ratio of 24 24 and a c o.