The role of PASP in daily chemicals

Polyaspartic acid (sodium salt), or PASP, is a biodegradable, non-toxic, and environmentally friendly chelating agent, scale inhibitor, and dispersant. In daily chemical products, PASP enhances performance by improving water quality, preventing mineral deposits, and boosting cleaning efficiency while meeting strict eco-regulations.

1. Key Functions of PASP in Daily Chemicals

① Scale & Deposit Inhibition

Prevents soap scum (calcium stearate) in shampoos, body washes, and hand soaps, improving rinsability.

Reduces limescale buildup in dishwashing detergents, washing machine cleaners, and bathroom cleaners.

Enhances foam stability in hard water by chelating Ca²⁺/Mg²⁺ ions.

② Metal Ion Sequestration

Chelates Fe³⁺, Cu²⁺, and Mn²⁺, preventing:

Discoloration in liquid soaps and detergents.

Oxidation of fragrances and active ingredients.

Enzyme deactivation (e.g., proteases in laundry detergents).

③ Anti-Redeposition & Soil Dispersion

In laundry detergents, PASP prevents dirt from reattaching to fabrics.

In cleaning products, it helps suspend and remove mineral deposits (e.g., lime, rust).

④ Eco-Friendly Alternative to Phosphates & NTA

Replaces phosphates (STPP) and nitrilotriacetic acid (NTA) in detergents, complying with EU Ecolabel, China GB/T 26396, and US EPA Safer Choice standards.

Biodegradable (>80% per OECD 301B), reducing environmental impact.

2. Applications in Daily Chemical Products

Product Category Role of PASP Typical Dosage

Shampoos & Body Washes Prevents mineral buildup, improves lather in hard water, and enhances rinsing. 0.1–0.5%

Laundry Detergents Softens water, prevents fabric stiffening, and boosts stain removal. 0.3–2%

Dishwashing Liquids Reduces spotting on glassware and prevents scale in dishwashers. 0.2–1%

Household Cleaners Removes limescale from sinks, tiles, and showerheads; improves hard surface cleaning. 0.2–1.5%

Facial Cleansers Minimizes residue on skin, suitable for sensitive skin formulations. 0.1–0.3%

3. Advantages Over Traditional Agents

Property PASP Phosphates (STPP) EDTA

Biodegradability >80% (OECD 301B) Poor (causes eutrophication) Non-biodegradable

Eco-Toxicity Safe for aquatic life Harmful to algae/fish Persistent organic pollutant

Scale Inhibition Effective for CaCO₃, CaSO₄ Strong but regulated Strong but non-green

pH Stability Works at pH 5–11 Best at pH 9–11 Broad range

4. Why Choose PASP?

✅ Sustainable – Meets global "zero phosphate" and "microplastic-free" trends.

✅ High Efficiency – Improves cleaning performance in hard water.

✅ Skin-Friendly – Reduces residue, ideal for mild personal care products.

✅ Regulatory Compliance – Accepted by REACH, EPA Safer Choice, and OEKO-TEX®.

Best For:

Phosphate-free detergents

Eco-certified home & personal care products

Hard water-resistant formulations

PASP is a green, high-performance ingredient that balances cleaning power with environmental safety in daily chemicals.