Nylon is significantly strengthened by the addition of glass-fibers. 30% glass filled nylon has 200% better strength than general purpose nylon but it is highly abrasive and will abraid or gall mating surfaces. Natural Nylon 12 L, 2 W Offering improved tensile, compressive and flexural properties over unfilled Nylon, 30% Glass-Filled Nylon provides increased load bearing characteristics and is the choice in applications where added stiffness, rigidity and dimensional stability are required.