High Refractoriness Thick Wall Ceramic Bonder for Casting

High quality raw materials and advanced forming process are used to make the thick wall ceramic sprue tube ,which is made of high temperature ,and it is better than ordinary thin-walled ceramic tubes .The tubes are suitable for medium and high end steel casting to do large flow and long time pouring. Product features: a . High density. b . The inner wall is smooth . c . The thermal shock is good. d . The resistance is strong. e . The fire resistance is high. f . The pressure strength is high. 1.The appearance and dimension allowable deviation for the thick wall ceramic sprue tube .It should be in accordance with table 1 : Item Index error (mm) Dimension allowable deviation Inner diameter <100 ±2 >100 ±3 Length <300 ±3 >300 ±4 Thickness 10-20 ±2 >20 ±3 Ovality deviation Inner diameter<ф100 ±2 Inner diameter>ф100 ±3 Fusion hole Non-critical area diameter <5 Bend Length<300 ±3 Length 300-500 ±4 2.The physical and chemical index for the thick wall ceramic sprue tube. It should be in accordance with table 2 : Item Al2O3content% FeO % refractorinessºC Reheating linear change(1400ºC.2h) Apparent porosity% Volume density g/m3 Cold crushing strength. Mpa standard ≥50 ≤2.5 ≥1760 +0.1 -1.2 ≤30 ≥2.10 ≥60