ASTM C491 – Test Method for Modulus of Rupture of Air-Setting Plastic Refractories (Withdrawn 1992) Related Test Methods ASTM D3178 ASTM D3177 ASTM D3176 ASTM D3175 ASTM D3174 ASTM D3173 ASTM D3172 ASTM D3171 ASTM D3170 ASTM D3168 ASTM D3167 ASTM D3166 Previous Post:ASTM C482 Next Post:ASTM C494