- ▸ Chelating agent: Sequesters calcium, iron, and other polyvalent metal ions.
- ▸ Scale inhibitor: Controls mineral scale in recirculating and boiler water.
- ▸ Corrosion inhibitor: Protects metal surfaces in water-treatment systems.
- ▸ Detergent chelant: Stabilizes formulations against metal-ion interference.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Etidronic Acid, Disodium Salt (CAS 7417-83-6) is the disodium salt of 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), an organophosphonate. The HEDP/etidronate class functions as a sequestering and chelating agent and as a scale and corrosion inhibitor in water-treatment programs, and serves as a chelant in cleaning formulations.
Frequently Asked Questions
What is diphosphonic acid (HEDP.Na2) used for?
Etidronic acid disodium salt (HEDP.Na2, CAS 7417-83-6) is an organophosphonate used as a sequestering and chelating agent and as a scale and corrosion inhibitor in water-treatment programs. It binds calcium, iron, and other polyvalent metal ions and is used as a chelant in cleaning formulations. RawSource supplies it in bulk for water-treatment and industrial-cleaning manufacturers.
What is another name for etidronic acid?
Etidronic acid is also known as 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP) and as hydroxyethylidene diphosphonic acid. This product is its disodium salt (HEDP.Na2). Confirm whether your specification calls for the free acid or the di-/tetra-sodium salt, as the CAS and active basis differ.
What is the difference between the disodium and tetrasodium salt of HEDP?
Both derive from the same HEDP phosphonate backbone but differ in degree of neutralization — the disodium salt (this product, CAS 7417-83-6) versus the tetrasodium salt, which is more fully neutralized and carries a different CAS and pH profile. Choose the salt that matches your formulation pH and chelation target, and verify the CAS on the CoA.
Is HEDP disodium hazardous to ship?
RawSource provides a current SDS with GHS classification and DOT information for each shipment; review it for handling and transport requirements specific to the supplied grade. This context does not carry a UN number for this product, so confirm transport status against the SDS before booking freight.
What is the cost of bulk HEDP disodium salt?
Pricing is quoted by order based on active concentration, volume, packaging (drum, tote, IBC), and freight. Send RawSource your target quantity and destination for a landed quote and lead time. Cost tracks phosphonate feedstock and order scale, so we quote rather than list.