of component a the epoxy containing monovalent organic group indicated by e is represented by the general formulae str4 where r 7 is a divalent organic group such as a methylene group ethylene group propylene group phenylene group hydroxylated hydrocarbon group chloroethylene group fluoroethylene group str5 the polyoxyalkylene group represented by g is the same as that described before in the explanation of component a d is a group selected from r e or g the value of x is from 0 to 500 and the values of y and z are each from 0 to 100 with x y z is equal to from 100 to 500 the preferred ranges of the polyoxyalkylene units and the siloxane units for component c are the same as those for the case of component a each of the molecules of component c should have an average of at least two epoxy containing organic groups and an average of at least one polyoxyalkylene group for the same reasons explained in the cases of component a and component b these epoxy containing organic groups and polyoxyalkylene groups can be present as terminal and or pendant groups in the molecular structures of the organopolysiloxanes component c like component b can be produced by using an addition reaction described in u s pat no 2 970 150 for example the relative amounts of the two organopolysiloxane components to be used in the compositions of this invention are not narrowly critical however an optimum amount of fiber treating compositions will be durably fixed to fibers treated therewith if.