Sodium Polyaspartate(PASP-Na)

Sodium Polyaspartate(PASP-Na)

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CAS No. 181828-06-8, 34345-47-6, 94525-01-6

Molecular formula: C4H5NO3M(C4H4NO3M)m(C4H4NO3M)nC4H4NO3M2

Molecular Weight: 3000-4000 or 7000-8000


  • Sodium polyaspartate;  
  • Sodium Salt of Polyaspartic Acid; 
  • Sodium PASP; 

Structural formula

Structural Formula

Product performance

Sodium polyaspartate, non-phosphorus, non-toxic, non-pollution and completely biodegradable, is an environmentally friendly chemical and belongs to a class of polyamino acids. The peptide bond on the main chain of the structure is easily broken by the action of fungi, microorganisms, etc., and is finally degraded into water and carbon dioxide that are harmless to the environment, which is safe and reliable.


  • Agriculture
  • Agriculture fertilizer synergist
  • Agriculture Soil conditioner;
  • Agriculture nutrient absorption enhancer;
  • Agriculture Simultaneous use with pesticides;
  • Corrosion inhibitor
  • Cleaning agent
  • Cosmetics
  • Building material preparations
  • Detergent
  • Dispersing
  • Fertilizers
  • Food industry
  • Leather industry
  • Material protection
  • Metal surface treatment
  • Micronutrients
  • Oilfield chemical
  • Optical brighteners
  • Petrochemicals
  • Petroleum exploitation
  • Pigments, colouring agent and dyestuff
  • Scale inhibitor
  • Sugar industry
  • Textile industry
  • Washing and cleaning agent industry
  • Water Treatment
  • Water softening
  • Wetting agent;

As a scale inhibitor, it is particularly suitable for inhibiting the formation of calcium carbonate scale and calcium sulfate scale in cooling water, boiler water and reverse osmosis treatment, and especially has a good effect on sulfate scales. It has synergistic effect after compounding with PBTCA, HEDP, etc.

As a corrosion inhibitor, it can be compounded with oxidized starch, organic phosphorus, zinc salt, etc., to achieve better corrosion inhibition effects. The lower concentration of polyaspartic acid at pH 8-9 has a better corrosion inhibition effect in seawater.

As dispersant, pigment dispersant (dye treatment for textile printing and dyeing), coal water slurry dispersant, etc.


Technical Specifications


PASP solution

PASP powder


Yellow to reddish-brown liquid

Yellow to brown powder

Solid content /%



pH value(1% aqueous solution)






Bulk density (Kg/Liter)




1. Phosphorus-free scale and corrosion inhibitor.

Polyaspartic acid PASP as a scale and corrosion inhibitor is widely used in salt industry, oilfield reinjection water, seawater desalination, drilling fluid viscosity reducer, industrial circulating water, boiler water, reverse osmosis water, coal water slurry additives and other water treatments. In high hardness, high alkalinity, high PH, high concentration multiple, and high temperature system, it has excellent performance.

2. Green detergent auxiliaries.

Such as detergent synergists (dishwashing detergent, laundry detergent, industrial washing Agent, etc).

Polyaspartic acid is electrolyte-resistant, alkali-resistant and low-foaming. The role of polyaspartic acid in washing is to soften the water,promote dispersion and anti-fouling, and prevent the oil stains that have been washed away from re-staining. The key point is that PASP is excellent in biodegradation.

3. Agricultural applications.

Used as fertilizer synergist, soil conditioner, wetting agent, nutrient absorption enhancer, promote the absorption of phosphorus by plants, and promote the growth of plant roots. Prevent drip irrigation pipes from scaling, alleviate soil compaction, and improve soil salinity.

In addition, the combined use with pesticides can improve the efficacy.

4.Cosmetics application.

Polyaspartic acid added to cosmetics can moisturize the skin, lock water on the skin, and improve skin elasticity.


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