3.the appearance of the test:

1. The packaging must be moisture-proof container;

2. Clean sand no rust, no soot particles;

3. loose sand, not wet, do not harden;

The sand under the microscope uniform size;

5. clean and free of sand and other impurities, inspection method: grasping a metal sand, then down and see ,No dust stick to your hands.

Four, do mesh standard sieve test: the sand has been poured into the corresponding stacking good automatic sieve uppermost sieve, the sieve is automatically working time of 10 minutes, transferred to a frequency specified location, working time to be automatic sieve each screen will automatically shut down in the sand, respectively, electronic weighing scales, write down the weight readings, inspection control corresponding data in the following table, beyond the standard range of the genus substandard sand, can be returned to the manufacturers

1. The standard test sieve: Ministry of Aerospace Industry fifth four zero factory screen. Take each sieve-like sand for 500g.

2. Sampling: amount of a bulk density of M = 1dm3 standard weight (natural pour).