Hydrotalcite is a synthetic layered double hydroxide (LDH). It works as a co-stabilizer and acid scavenger in plastic production. Unlike main heat stabilizers that provide thermal protection directly, hydrotalcite enhances and extends their effects by neutralizing harmful by-products like HCl or acid residues.
It is widely used in PVC, polypropylene (PP), polyethylene (PE), and halogen-free flame retardant (HFFR) cable compounds to improve thermal stability, light resistance, and processing window.
| Property | Specification |
|---|---|
| Appearance | White fine powder |
| Surface Area (BET) | 10 – 25 m²/g |
| Particle Size (D50) | 0.5 – 1.5 μm |
| Loss on Ignition (LOI) | ≤ 40% |
| pH (10% aqueous slurry) | 8.5 – 10.5 |
| Heavy Metals (Pb, Cd) | Not detected |
| Whiteness (ISO) | ≥ 95 |
| Recommended Dosage | 0.5 – 3 phr |
| Customer Concern | Our Product Response |
|---|---|
| Will it affect the transparency of my film? | No. Ultrafine grade ensures excellent clarity. |
| Can it be used in HFFR compounds with ATH? | Yes. It helps reduce smoke and improve stability. |
| Does it replace Ca-Zn stabilizers? | No. It enhances their performance, not replaces them. |
| Is it safe for food contact applications? | Yes. Food-grade versions available on request. |
| Can I use it in PE-PP blends? | Yes. Fully compatible with polyolefins. |
Q1: What’s the main function of hydrotalcite in PVC?
It captures acidic gases (like HCl) during processing, helping Ca-Zn stabilizers work longer and more effectively.
Q2: How is it different from main stabilizers?
Hydrotalcite is a co-stabilizer. It doesn’t replace primary stabilizers but improves their efficiency.
Q3: Will it cause surface defects or plate-out?
No. It has low volatility and good dispersion, especially in coated grades.
Q4: Is it compatible with filler-rich compounds?
Yes. It performs well in high-filler systems, such as cable sheathing with ATH or magnesium hydroxide.
Q5: Do you offer hydrotalcite masterbatch?
Yes. We can provide pre-dispersed masterbatches or custom blends for your process.
