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By certification 
Advantages
quality
1. reasonable price and good quality
2. high purity, less impurities
3.Dense, rolling, oxidation, forming plasticizers
4.relatively high density, grain uniformity axis, consistency
quality
1. reasonable price and good quality
2. high purity, less impurities
3.Dense, rolling, oxidation, forming plasticizers
4.relatively high density, grain uniformity axis, consistency
