我厂根据苏联专家建议,在30公斤以上的铸件上,广泛采用了过滤纲浇口,避免渣子进入铸件内而造成废品.1.制造过滤纲材料成分配合:伊胡塔新砂100%,粘土2.5%,糊精(用土豆粉代替)4%,亚硫酸盐纸浆废液4%,桐油(用亚麻油代替)5%.其物理性能为:透气性60,水分3.8—4.2%,湿压强度0.12—0.15公斤/公分~2,干拉强度8—10公斤/公分~2.干燥温度为200—230℃,时间为2小时. According to the suggestion of the Soviet experts, our factory extensively adopts the filter gate to prevent the slag particles from entering the castings, resulting in the waste products of more than 30kg.Materials of the filter materials: 100% of the new clay of IJUTA, 2.5 %, Dextrin (instead of potato flour) 4%, sulfite pulp waste 4%, tung oil (with linseed oil instead) 5% .The physical properties are: breathability 60, moisture 3.8-4.2% 0.12-0.15 kg / cm ~ 2, dry tensile strength of 8-10 kg / cm ~ 2. The drying temperature is 200-230 ℃, the time is 2 hours.