Boric Acid 99.9% Electronic Grade

Boric Acid 99.9% Electronic Grade (CAS 10043-35-3, molecular formula H3BO3) is a process chemical for electronics and metal finishing, where trace metal content and particle contamination matter as much as headline assay. China Chemicals supplies it at 99.9% min in pack sizes from 1 kg through to 1000 kg Bulk Bag, so laboratory trial quantities and full production volumes can be sourced from the same specification.

It is also traded as Orthoboric Acid, Boracic Acid, Hydrogen Borate. Every consignment ships with a batch-specific Certificate of Analysis and the current Safety Data Sheet, and material is stored and picked under stock rotation so you receive product well inside its shelf life.

Typical applications

Buffering agent in nickel and zinc plating baths
Borosilicate glass and glass fibre manufacture
Flux in brazing, welding and metal casting
Flame retardant in cellulose insulation and timber
Neutron absorber in nuclear coolant systems

Technical specification

Chemical name	Boric Acid 99.9% Electronic Grade
Synonyms	Orthoboric Acid, Boracic Acid, Hydrogen Borate
CAS number	10043-35-3
Molecular formula	H3BO3
Appearance	White crystalline powder or granules
Assay H3BO3	99.9% min
Sulphate	0.05% max
Chloride	0.005% max
Iron (Fe)	5 ppm max
Heavy metals as Pb	10 ppm max
Water insolubles	0.005% max

Values above are typical and are confirmed on the Certificate of Analysis issued against each batch. Tighter specifications can be quoted where a process requires them.

Packaging and supply

Available in 1 kg, 5 kg, 25 kg Bag, 1000 kg Bulk Bag. Bulk, road tanker and export drum quantities are quoted on request, including FOB and CIF terms for international shipment. Pricing shown is per pack in USD, exclusive of freight and any applicable duties.

Handling and safety

Transport classification: Not regulated · Reproductive toxin (category 1B). Store in the original closed container in a cool, well-ventilated area away from incompatible materials, and handle using appropriate personal protective equipment. Read the Safety Data Sheet in full before use — it is issued with every order and is available on request before purchase.

Supply to industry only. Products are sold for legitimate industrial, laboratory and manufacturing use. We may request end-use details and business registration before releasing an order.