ASTM C491 – Test Method for Modulus of Rupture of Air-Setting Plastic Refractories (Withdrawn 1992) Related Test Methods ASTM D1894 ASTM D189 ASTM D1889 ASTM D1883 ASTM D1882 ASTM D1881 ASTM D1876 ASTM D1875 ASTM D187 ASTM D1857 ASTM D1849 ASTM D1840 Previous Post:ASTM C482 Next Post:ASTM C494