carried out advantageously the suitable preferred and best mode parameters of the process of the invention are given below in table i the following definitions apply to this data 34 dispersion consistency 34 is the percent by weight of the glass fibers in the stock aqueous dispersion medium 34 formation consistency 34 is defined as the consistency of the fibers at the head box of the mat forming machine which may be the same or lower consistency than the dispersion consistency the dispersion composition may be diluted with water before entering the head box this 34 diluted formation consistency 34 is given in table i the 34 amine oxide concentration 34 is given in ppm of this component the 34 derivatized guar gum concentration 34 is indicated as percent by weight of the composition table i__________________________________________________________________________numerical parameters of the process of the inventionfiber diluted fiber conc of glassdispersion formation conc of derivatized glass fiberconsistency consistency amine oxide guar gum fiber diameter ppm by wt length in microns __________________________________________________________________________suitablerange 0 1 2 0 01 1 5 500 0 05 0 5 1 8 3 3 20preferredrange 0 2 1 0 02 0 5 10 200 0 1 0 3 1 4 2 5 18best modevalue 0 5 0 03 20 0 2 1 16__________________________________________________________________________ commercial glass fibers which.