Foster® 42-24™ Mast-A-Fab® Reinforcing Membrane has a synthetic fiber composition that provides for significantly greater elongation, recovery, and freedom from stress breakage. Glass cloth has virtually no elongation and breaks sharply under stress.
MAST-A-FAB has a leno weave that gives stability to the fabric, eliminating the thread movement and distortion inherent to plain weave cloths. It will not detectably affect the flame spread and smoke developed ratings of the selected mastic or coating.
MAST-A-FAB is easy to bond to and wets out readily compared to glass cloth. This minimizes the possibility of disbonding of tack and finish coats, a common problem with glass membrane reinforcement.
For the most up-to-date SDS sheet, visit the manufacturer’s website: Foster Products