ASTM C491 – Test Method for Modulus of Rupture of Air-Setting Plastic Refractories (Withdrawn 1992) Related Test Methods ASTM C806 ASTM C805 ASTM C794 ASTM C793 ASTM C791 ASTM C786 ASTM C780 ASTM C78 ASTM C773 ASTM C769 ASTM C767 ASTM C765 Previous Post:ASTM C482 Next Post:ASTM C494