... 4mm aperture standard sieve. It is mainly used in photographic paper, fixature and galvanoplastics liquid, match and wooden furniture. ... gelatin Mainly used in the following industries:Sand paper,emery cloth,paper making,printing,textile,silk,printing& dyeing,match ... several fields,such as petro, thermoelectricity, tourism, culture and paper-trading, chemicals-trading, steel-trading, gelatin-making etc. ...