AFS Foundry Sand Testing Equipment Operating Instructions Manual

RIDSDALE-DIETERTSAND SPECIFIC SURFACE TESTER (cont’d)(16) To determine the theoretical specific surface, remove the sand sample from the burette anduse the same sand for a screen analysis.PROCEDURE (cont’d)(17) Place the sand on the top sieve of a stack of BS 410: 1986 or DIN 4188 (ISO R565) SeriesSieves. Cover and set the stack in a suitable Sieve Shaker and fasten securely. Operatethe sieve shaker for 15 minutes.(18) Following the instructions supplied with the BS 410 : 1986 or DIN 4188 (ISO R565) seriessieves, determine the cumulative weight for each sieve.(19) By subtraction, calculate the weight of sand retained on each sieve. Multiply the weight oneach sieve by 2, and record as percent retained on each sieve.(20) Multiply the percent retained on each sieve by the appropriate theoretical surface factor asgiven in the table on the next page. Add the products and divide by 100 to determine thetheoretical specific surface area S th .18