Comparison of Core Differences between PVC Calcium Zinc Stabilizers and Lead Salt Stabilizers:
1、 Environmental friendliness and toxicity
1. Calcium zinc stabilizer
Completely free of heavy metals such as lead and cadmium, in compliance with EU RoHS/REACH environmental standards;
FDA certified, suitable for safety sensitive fields such as food packaging and medical devices.
2. Lead salt stabilizer
Containing heavy metal lead, toxic dust pollution is generated during processing, and long-term exposure can harm human health;
Abandoned products can easily cause soil and water pollution.
2、 Thermal stability mechanism
1. Calcium zinc stabilizer
Through a dual layer repair mechanism: zinc soap replaces unstable chlorine atoms, calcium soap regenerates zinc soap to extend the stability period;
It is necessary to use synergists such as β – diketone and hydrotalcite to enhance stability (with an addition amount of 0.3% -2%)
2. Lead salt stabilizer
Directly forming a complex with PVC molecules, efficiently blocking the HCl removal chain reaction;
A single component can achieve long-term thermal stability without the need for complex synergistic systems.
3、 Processing performance
| Comparison items | Calcium zinc stabilizer | 铅盐稳定剂 |
| Lubricity | Accurate control of lubricant ratio is required (excessive amount is prone to precipitation) | Comes with lubrication characteristics and a wide processing window |
| hue control | The product is prone to bluish tint and needs to be corrected by adding toner | High color stability and small fluctuations between batches |
| Melt flowability | Reduce plasticizing temperature by 5-10 ℃ |
Has little impact on the viscosity of the melt |
4、 Application scenario limitations
1. Calcium zinc stabilizer
Transparent products need to add hypophosphite (0.5%) to improve transparency;
High filling systems (calcium carbonate>30phr) are prone to frost problems.
2. Lead salt stabilizer
◉ Only applicable to opaque products (such as pipes and profiles);
The sulfur-containing environment in the north can easily cause the surface of products to sulfide and turn black.
5、 Economic differences
The density of calcium zinc stabilizer is 40% lower, which can increase the amount of filler added and reduce costs;
The unit price of lead salt stabilizers is lower, but additional costs for heavy metal treatment need to be borne;
Through multidimensional comparison, it can be seen that calcium zinc stabilizers have an absolute advantage in environmental adaptability, while lead salt stabilizers still retain specific application value in processing tolerance and cost control.
Post time: May-17-2025
