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GRAIN SIZE DISTRIBUTION AND PHYSICAL CHARACTERISTICS OF COATED SAND
Measure unit Value
Residue > 0,500 mm % max. 0,70
Residue <0,063 mm % max. 0,50
Uniformity ratio % min. 65
AFS number / min. 60
Medium grain size, d50 mm 0,19 – 0,23
CHARACTERISTICS OF COATED SAND
Strength in hot, 280ºϹ/90sec MPa min. 1,20
Peel-back, 200ºϹ /60sec % max. 65
Peel-back, 200ºϹ /300sec % max. 20
Loss on ignition, 900ºϹ (2h) % max. 4,20
Content of nitrogen in coated sand, N % max. 0,18
CHEMICAL ANALYSIS OF BASIC SAND
SiO2 % min.98,50
Al2O3 % max.0,80
Fe2O3 % max.0,05
Moisture content % max.0,50