| http://www.w3.org/ns/prov#value | - Any color changing or dirty can be easily. removed by density 1.02g/cm3 hydrochloric acid or proper organic solution .3) On laminated face, the defects such as bubble, impressed pitting, nick and glue lack and outer impurity which retard its use are not allowed .4) Usually used in PCB of computers, home electric appliances and other lines .
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