Acrylic Acid / AMPS Copolymer
CAS 40623-75-4 AA + AMPS copolymer
- CAS number
- 40623-75-4
- Formula
- AA + AMPS copolymer
- Molar mass
- No single formula · MW ~1,000–20,000 (by grade)
- Appearance
- Colourless to light-yellow transparent liquid.
The acrylic acid/AMPS copolymer is a sulfonated antiscalant and dispersant built for water that defeats plain polyacrylates. The carboxyl groups do the scale inhibition and dispersion; the bulky sulfonate groups keep the polymer soluble when calcium is high and the pH is alkaline, which is precisely where a straight polyacrylate would drop out and stop working. It holds calcium carbonate, calcium phosphate and zinc scale in suspension and disperses iron oxide. As a copolymer it is bought on solids content and molecular weight rather than a purity figure. Ehlinar supplies it by active content and molecular weight.
Applications
Grades & packaging
Defined by solids/active content (around 40% minimum), molecular weight, free-monomer level (as AA ≤0.8%), density (≥1.15) and pH (3.5–4.5 at 1%) rather than a purity figure; grades differ by monomer ratio and neutralisation.
- 200 L drums (~250 kg)
- 1000 L IBC (~1250 kg)
- Bulk
How we supply
- Certificate of Analysis (CoA), lot-specific where available
- Safety Data Sheet (SDS / MSDS)
- Technical Data Sheet (TDS)
- Certificate of Origin / Certificate of Conformity
Independent third-party inspection can be arranged on request, with the agency and scope agreed per trade. Representative samples can be requested for qualification, subject to supplier availability. We recommend incoming quality control against the agreed CoA.
Quoted on standard Incoterms (e.g. EXW, FOB, CIF, DAP) as agreed per trade. Delivery region, packaging and grade are confirmed per quote.
Documents and services above are subject to supplier availability and confirmed per quote; nothing here is an offer.
Typical / indicative values — not a binding specification
| Property | Typical |
|---|---|
| Solids / active content | ~40% min |
| Molecular weight | ~1,000–20,000 |
| Free monomer (as acrylic acid) | ≤0.8% |
| Density | ≥1.15 |
| pH (1% solution) | 3.5–4.5 |
Also known as
AA/AMPS · Sulfonated polyacrylic acid copolymer · Poly(AA-co-AMPS) · Acumer 2000 · Aquatreat AR-540
Frequently asked questions
- What is the purity of AA/AMPS copolymer?
- Purity % does not apply to a copolymer — it is specified by solids/active content and molecular weight, with limits on free monomer, density and pH.
- Which CAS goes on the documents?
- 40623-75-4 for the free-acid copolymer; a sodium-salt grade may carry a different identifier.
- Why choose it over a plain polyacrylate?
- The AMPS sulfonate groups give higher calcium tolerance and better performance in high-hardness, high-pH water.
- What dosage is typical in cooling water?
- Published guidance for this polymer family sits around 10 to 30 mg per litre of circulating water, set against the actual water chemistry rather than a fixed rule. Systems running high hardness or high phosphate normally sit at the upper end of that band.
- How does it behave at high temperature?
- Better than most polyacrylates. Work on sulfonated acrylic copolymers reports scale inhibition holding across a wide pH band and remaining useful at temperatures up to around 150 °C, which is why the chemistry appears in oilfield injection and high-cycle cooling systems.
Enquire about Acrylic Acid / AMPS Copolymer
Related products
Figures and identifiers here are compiled from public references and provided for general information; they are indicative, not a specification. See all products.