... , this product is a concentrated chemical boron product, the content of boron is more than 21.4%, is ... two times higher than the content of boron in borax.2,Quick dissolve, this product dissolves ... , this product is a concentrated chemical boron product, the content of boron is more than 21.4%, is ... two times higher than the content of boron in borax.2,Quick dissolve, this product dissolves ...