Abstract: A continuous wet-laid process for making high-strength glass fiber mats is described. In the process, glass fibers of known quantity are fed directly into a water stream of given volume to form a flowing fiber slurry of predetermined fiber consistency. Immediately thereafter, the flow of the slurry is interrupted turbulently to form a uniform fiber dispersion. The dispersion then is conveyed quickly onto a moving mat-forming wire screen to form the desired mat. The water thus-removed is recirculated into the original stream to provide a continuous operation. The process may be used advantageously for making high-strength mats of relatively long glass fibers, which find utility in the manufacture of asphalt roofing shingles, and as backing sheets for vinyl flooring.