A PROCESS OF MAKING A MAT OF GLASS FIBERS WHEREIN A STRAND OF GLASS FIBERS FRICTIONALLY ENGAGES THE SURFACE OF A REVOLVING CYLINDER FROM WHICH THE STRAND IS TANGENTIALLY DISCHARGED ONTO A MOVING CONVEYER. THE STRAND IS CAUSED TO BE RANDOMLY LOOPED UPON THE CONVEYER BY ALTERNATE BLASTS OF AIR WHICH LATERALLY IMPINGE UPON THE STRAND TO THROW THE STRAND IN A LOOPED FASHION FROM SIDE TO SIDE ACROSS THE CONVEYER. HIGH UNIFORM MAT STRENGTHS ARE OBTAINED BY WETTING THE INDIVIDUAL FILAMENTS OF GLASS WITH A WATER SOLUTION OF ORGANOSILANE AND A NONIONIC LUBRICANT, THE PRINCIPAL CONSTITUENT OF THE MOLECULES OF WHICH IS A POLYOXYETHYLENE POLYHYDRIC ALCOHOL CONDENSATE GROUPING.