Replacing Lead Stabilizers with Calcium-Zinc: What Factories Care About Most

1. Why Lead Must Go

Lead stabilizers are cheap and offer long heat stability times, and many factories have used them for over a decade. But the problem is not performance — it is compliance: many export markets restrict lead-containing products, RoHS and REACH both regulate them, and export orders easily get stuck at environmental review; lead dust in workshops and lead-containing waste are also burdens. When a customer asks, "Do your products contain lead?" and you cannot answer, the order is lost. So switching is not about following a trend; it is about keeping exports and customers. In China, calcium-zinc stabilizers are already mainstream, and the share of lead stabilizers is already very, very small. Finally, because lead is a heavy metal, mining, transportation, and application all cause a certain amount of environmental pollution. As compliance pressure keeps rising, costs keep rising too. So phasing out lead stabilizers and switching to environmentally friendly calcium-zinc stabilizers is the general trend, and a wise choice.

2. Can Calcium-Zinc Match Up?

Calcium-zinc stabilizers contain no lead, cadmium, or other environmentally unfriendly metals, and comply with RoHS and REACH regulations — that is the precondition for replacing lead. On performance, the key is picking the right grade: Ca-Zn is not one grade for everything; cable, electronic wire, foam, rigid, and transparent products each have corresponding grades, and with the right grade, processing and product performance both measure up. The old problem of Ca-Zn products turning bluish or dark has been solved at the formulation-design level — the crystal-clear base color of the transparent T series targets exactly this pain point.

3. Grades by Application

All dosages and performance figures below are verified figures; refer to each grade's TDS for specifics:

Cable compounds: GB-200 and GB-300 meet the national 70-degree standard, GB-313 meets the national 90-degree standard; 200℃ heat stability time is over 90 minutes for GB-200 and GB-300, and over 200 minutes for GB-313; dosages are GB-200 standard 5 phr, GB-300 4–6 phr, GB-313 8–12 phr.

Electronic wire: S-210 and S-310, meeting UL90 and UL105.

Foam shoe materials and yoga mats: S-300, dosage 4–7 phr.

Rigid PVC: S-510 (pipe grade), S-530 (3.0–4.0 phr), S-580 (4–6 phr).

Transparent products: the T series, following the methyl tin-replacement route.

4. Four Things to Do When Switching

First, trial samples. Don't switch a whole batch at once. Take free samples and run them on your own formulation and process first, confirm the processing window and product appearance, then finalize the dosage.

Second, lubricants may need fine-tuning. Lead and Ca-Zn have different lubrication needs; if roll sticking or exudation appears after switching, look at lubrication first.

Third, clean the machines. Equipment that previously ran lead must be thoroughly cleaned before running Ca-Zn, to avoid lead residue mixing into new products and affecting environmental testing.

Fourth, adjust dosage by hardness. The general rule is: more for hard products, less for soft ones, fine-tuning within the recommended range in combination with your own formulation.

5. Conclusion

YesPVC has worked on PVC heat stabilizers for 18 years, is a national high-tech enterprise (recognized since 2018), implements the ISO 9001 quality management system, and its products have passed SGS testing certification and comply with RoHS and REACH regulations. We provide free samples and formulation support, with trial orders from 100 kg. If you are unsure about switching, submit your product type and process through our contact page, and we will recommend grades by application.