ASTM C491 – Test Method for Modulus of Rupture of Air-Setting Plastic Refractories (Withdrawn 1992) Related Test Methods ASTM D4292 ASTM D4291 ASTM D4290 ASTM D429 ASTM D4289 ASTM D4287 ASTM D4284 ASTM D4281 ASTM D4280 ASTM D4274 ASTM D4272 ASTM D427 Previous Post:ASTM C482 Next Post:ASTM C494