Flux is a low melting point glass, is lead oxide and boron silicate glass.
助熔剂为矮熔不背玻璃, 多见的有氧化铅和硼硅酸盐解的玻璃.
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Non - alkali cloth made form aluminum boron silicate glass contains less than 0.8 % of alkali metal oxide.
无碱布采用铝硼硅酸盐玻璃成份,其碱金属氧化物含量不大于0.8%.
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