- ▸ Scale inhibition: Controls carbonate and sulfate scale in cooling water.
- ▸ Corrosion control: Contributes to corrosion inhibition in treatment programs.
- ▸ Phosphorus-free treatment: Alternative where phosphorus discharge is restricted.
- ▸ Dispersancy: Helps keep mineral particulates suspended.
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 →Polyepoxysuccinic acid (PESA; CAS 51274-37-4) is a phosphorus-free, readily biodegradable scale and corrosion inhibitor for water treatment. It is a non-nitrogen, non-phosphorus polycarboxylate that controls carbonate, sulfate and silica scale and inhibits corrosion, and it keeps working in the hardest, highest-pH, highest-alkalinity cooling water where many inhibitors fail — the reason it is chosen for high-cycle and discharge-restricted systems.
What is polyepoxysuccinic acid?
PESA is a low-molecular-weight polyether-polycarboxylic acid (usually supplied as the sodium salt solution). It works by threshold inhibition and crystal distortion — adsorbing onto scale nuclei at a few ppm so they cannot grow into adherent deposits — and it chelates calcium with unusually high tolerance. Because it contains no phosphorus and no nitrogen and is recognized as readily biodegradable, it is specified where phosphate discharge is limited.
Applications by sector
Cooling water. A scale and corrosion inhibitor for recirculating cooling systems, effective at high cycles of concentration, high pH and high hardness. Reverse osmosis & desalination. An antiscalant for membrane systems. Oilfield & industrial water. Scale control in produced and process water, and in boilers and field water systems. It is frequently blended with other inhibitors and dispersants; dose to your water chemistry and verify by residual testing.
Forms and grades
Supplied as an aqueous solution at a stated active content (typically as the sodium salt); confirm active level on the RFQ. The CoA documents the lot.
Handling and documentation
Handle per the current Safety Data Sheet (SDS); each lot ships with a Certificate of Analysis (CoA).
Bulk supply and RFQ
RawSource supplies PESA in bulk to water-treatment formulators and end users, with CoA and SDS per lot. Submit an RFQ with your active level and target quantity. Related scale-control chemistry: HEDP disodium salt; see the scale inhibitors guide and water treatment chemicals guide.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical Name | Polyepoxysuccinic acid (PESA) |
| CAS Number | 51274-37-4 |
| Chemical type | Phosphorus-free, non-nitrogen polyether-polycarboxylate |
| Appearance | Amber aqueous solution (sodium salt) |
| Active content | Grade-dependent — see CoA |
| Function | Threshold scale inhibitor; corrosion inhibitor; high Ca tolerance |
| Attributes | Phosphorus-free; recognized as readily biodegradable; effective at high pH/hardness |
Frequently Asked Questions
What is PESA used for?
Polyepoxysuccinic acid (PESA, CAS 51274-37-4) is a phosphorus-free scale and corrosion inhibitor for cooling water, reverse-osmosis and oilfield/industrial water, especially effective at high pH, high hardness and high cycles of concentration.
Why choose PESA over phosphonates?
PESA contains no phosphorus and no nitrogen and is recognized as readily biodegradable, so it is chosen where phosphate discharge is restricted, and it tolerates higher hardness and pH than many phosphonates. Evaluate performance against your specific water chemistry.
Is PESA biodegradable?
It is recognized as readily biodegradable and is phosphorus-free, which is why it is used in environmentally restricted programs. Confirm any specific classification against the SDS for your jurisdiction.
What is the CAS of PESA?
Polyepoxysuccinic acid is CAS 51274-37-4. As a polymer it is supplied as an aqueous solution at a stated active content; the CoA documents each lot.
How is bulk PESA supplied and quoted?
RawSource supplies it as an aqueous solution in bulk with CoA and SDS per lot. Pricing is quote-based on active level and volume; submit an RFQ with your target quantity.
Disclaimer. Information on this page — including chemical properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot you purchase governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim, or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information.