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Boric acid, is a weak acid of boron often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds.
It has the chemical formula H3BO3 (sometimes written B(OH)3), and exists in the form of colorless crystals or a white powder that dissolves in water.
When occurring as a mineral, it is called sassolite.
Specification as follows:
| Item | Index | ||
| First grade | Second grade | Third grade | |
| Boric acid(%) | ≥99.5% | ≥99% | 98.5% |
| Water insolubles(%) | ≤0.05% | ≤0.1% | ≤0.15% |
| Sulfate(SO4)(%) | ≤0.10% | ≤0.30% | ≤0.40% |
| Chloride(CL)(%) | ≤0.01% | ≤0.05% | ≤0.05% |
| Iron(Fe)(%) | ≤0.003% | ≤0.005% | ≤0.005% |
boric acid