What is Sodium Polyaspartate CAS 35608-40-6?

Sodium polyaspartate, commonly called PASP, is a water-soluble polyamide polymer derived from aspartic acid. It is used as a biodegradable, phosphorus-free antiscalant, dispersant and chelating agent.

Why does this product also appear under CAS 181828-06-8?

Sodium polyaspartate is listed by multiple CAS numbers depending on the registry source and salt representation. CAS 181828-06-8 is a common alternative to 35608-40-6 for the same sodium salt of polyaspartic acid, so both numbers may appear on technical documents.

What environmental advantage does PASP offer over phosphonate antiscalants?

PASP is phosphorus-free and readily biodegradable, so it does not contribute the same eutrophication risk associated with many phosphonate scale inhibitors. This makes it suitable for environmentally sensitive water-treatment programs.

What are the main applications?

Typical uses include cooling-water and boiler-water scale inhibition, reverse-osmosis systems, seawater desalination, industrial cleaning, detergent formulations and agricultural nutrient systems where mild metal chelation or dispersion is needed.

Why is PASP used as a fertilizer synergist?

PASP can chelate micronutrients and help keep them available to plants, while its dispersing behavior may slow crystallization or precipitation of nutrients in soil or fertilizer solutions. Agronomic use should follow local fertilizer regulations and trial results.

Which grade and packaging are available?

The listing is industrial/water-treatment grade and is supplied in 25 kg or 250 kg plastic drums or 1000 L IBC totes. Custom packaging can be arranged on request.

How should sodium polyaspartate be stored and handled?

Store in closed compatible containers in a cool, dry, ventilated area away from strong oxidizers and incompatible materials. Avoid freezing and excessive heat, use chemical-resistant gloves and eye protection, and follow the safety information.

Sodium Polyaspartate (PASP) CAS 35608-40-6

Sodium Polyaspartate (PASP), CAS 35608-40-6, is a biodegradable, phosphorus-free polyamide polymer supplied as a water-treatment scale inhibitor, dispersant and chelating agent for cooling water, boiler water, reverse osmosis, desalination, detergents and agricultural nutrient systems. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 35608-40-6
Synonyms: Sodium Polyaspartate, Polyaspartic acid sodium salt, PASP, Sodium salt of polyaspartic acid, Biodegradable scale inhibitor
Einecs: 639-847-1
Molecular Formula: (C₄H₄NO₃Na)ₙ
Grade: Industrial Grade / Water Treatment Grade
Package: 25 kg / 250 kg plastic drums or 1000 L IBC totes (custom packaging on request)

Request a quote

Share:

Product Description

Sodium Polyaspartate, CAS 35608-40-6, also known as polyaspartic acid sodium salt or PASP, is a water-soluble polyamide polymer derived from aspartic acid; the EC/EINECS number is 639-847-1.

Synonyms: PASP; polyaspartic acid sodium salt; sodium salt of polyaspartic acid; biodegradable scale inhibitor.

CAS: 35608-40-6.

Molecular formula (repeat unit): (C₄H₄NO₃Na)ₙ.

Average molecular weight: about 1,000–5,000.

EC number: 639-847-1.

It is a yellow to amber clear liquid, supplied as a polyanionic water-soluble polymer.

A 1% aqueous solution has a pH of about 9.0–11.0; the density is at least about 1.20 g/cm³.

It is readily biodegradable and is phosphorus- and nitrogen-free, offering a lower eutrophication risk than many phosphonate antiscalants.

It is used in circulating cooling water and boiler water as a non-phosphorus scale and corrosion inhibitor.

It is used in reverse-osmosis and desalination systems to control hardness scale and dispersed iron.

It is used in oilfield injection water and produced-water re-injection as a scale and corrosion inhibitor, and as a drilling-fluid dispersant.

It is used in household and industrial detergents as a biodegradable builder and dispersant.

It is used as a fertilizer synergist and soil conditioner to improve nutrient availability.

Confirm active-polymer or solids content, molecular-weight range, pH, density, viscosity, residual monomer and application-specific performance.

Store in closed compatible containers in a cool, dry, ventilated area away from strong oxidizers; avoid freezing and excessive heat.

Confirm packaging with the requested quantity and destination requirements.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required grade, quantity, packaging, destination and document needs.

FAQ - Technical & Supply Chain

Q:
What is Sodium Polyaspartate CAS 35608-40-6?

A: Sodium polyaspartate, commonly called PASP, is a water-soluble polyamide polymer derived from aspartic acid. It is used as a biodegradable, phosphorus-free antiscalant, dispersant and chelating agent.
Q:
Why does this product also appear under CAS 181828-06-8?

A: Sodium polyaspartate is listed by multiple CAS numbers depending on the registry source and salt representation. CAS 181828-06-8 is a common alternative to 35608-40-6 for the same sodium salt of polyaspartic acid, so both numbers may appear on technical documents.
Q:
What environmental advantage does PASP offer over phosphonate antiscalants?

A: PASP is phosphorus-free and readily biodegradable, so it does not contribute the same eutrophication risk associated with many phosphonate scale inhibitors. This makes it suitable for environmentally sensitive water-treatment programs.
Q:
What are the main applications?

A: Typical uses include cooling-water and boiler-water scale inhibition, reverse-osmosis systems, seawater desalination, industrial cleaning, detergent formulations and agricultural nutrient systems where mild metal chelation or dispersion is needed.
Q:
Why is PASP used as a fertilizer synergist?

A: PASP can chelate micronutrients and help keep them available to plants, while its dispersing behavior may slow crystallization or precipitation of nutrients in soil or fertilizer solutions. Agronomic use should follow local fertilizer regulations and trial results.
Q:
Which grade and packaging are available?

A: The listing is industrial/water-treatment grade and is supplied in 25 kg or 250 kg plastic drums or 1000 L IBC totes. Custom packaging can be arranged on request.
Q:
What specifications should be checked before ordering?

A: Confirm active-polymer or solids content, molecular-weight range, pH, density, viscosity, residual monomer and application-specific performance. Request the current batch analysis, technical data and safety information before purchase.
Q:
How should sodium polyaspartate be stored and handled?

A: Store in closed compatible containers in a cool, dry, ventilated area away from strong oxidizers and incompatible materials. Avoid freezing and excessive heat, use chemical-resistant gloves and eye protection, and follow the safety information.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

Tell us which documents your procurement team needs. Before an order, we will check whether the quoted source can provide them for the offered lot.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Ask whether samples, trial quantities or repeat orders are possible. We will check each request against the sourced product and current offer.

Storage & Shipping

Product-specific conditions are confirmed before order.

Current Language

Change Language