Borax for soil application

We are looking for manufacturer of Borax as follows:
BORAX (SODIUM TETRABORATE) (Na2B4O7 10H2O) for soil application
CHEMICAL COMPOSITION
1. Content of Boron (as B) percent by weight, minimum: 10.5
2. Matter insoluble in water percent by weight, maximum: 1.0
3. Lead (as Pb) percent by weight, maximum: 0.003
4. pH: 9.0 - 9.5
Others
Labeling & packaging as per the manufacturer’s specification