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Product Overview
This product is an environmentally friendly powder calcium-zinc composite heat stabilizer developed by WSD CHEMICAL. With high-efficiency calcium salts and zinc salts as its core components, it is compounded with dedicated lubricants, antioxidants and hydrotalcite-based auxiliary stabilizers. It is a complete replacement for conventional toxic lead-based stabilizers and is suitable for the production of rigid and semi-rigid PVC articles. The product carries no risk of heavy-metal leaching and no sulfide staining. Its powder form offers excellent dispersibility and can be charged directly into the high-speed mixing stage without any additional pretreatment, providing PVC processors with an environmentally compliant and performance-stable heat stabilization solution.
Technical Specifications
Item | Index |
Appearance | White or slightly yellow uniform powder |
Total Ca/Zn Metal Content | ≥10.5% (Customizable range: 12%-18%) |
Initial Melting Point | 70~ 120 °C (Standard grade: 80~95°C) |
Loss on Heating (Volatiles) | ≤0.6% |
Bulk Density | 0.35~0.9 g/cm³ |
Residue on 40-mesh Sieve | ≤2% |
Congo Red Stability at 180°C | ≥30 min (≥60 min for cable-grade) |
Thermal Stability at 200°C (Cable Grade) | ≥110 min |
Total Heavy Metals (Pb+Cd+Hg+Cr) | ≤5 ppm |
Phthalates Content | Not Detected (Compliant with REACH) |
Exudation Test (60°C × 72h) | No visible oily exudate on surface |
Recommended Dosage | 1.5~5.0 phr (Adjust based on application) |
Shelf Life at 25°C | 24 months |
WSD Chemical's Main Calcium-Zinc Stabilizer Grades
Grade (Type) | Recommended Application | Recommended Dosage (phr) |
WSD-801 | UPVC pipe | 2.5–4.0 |
WSD-802 | Fitting | 3.5–4.5 |
WSD-803 | Profile | 4.5–5.0 |
WSD-804 | Wire or cable | 4.5–5.5 |
WSD-805 | Shoes | 1.0–1.5 |
WSD-806 | SPC floor | 6.0–8.0 |
WSD-807 | Foaming board | 4.5–5.5 |
WSD-808 | Transparent | 0.75–1.0 |
Product Features
1.Excellent heat stability—it continuously neutralizes the HCl generated during high-temperature PVC processing, suppresses early-stage yellowing and extends the overall processing stability window, reducing line stoppages for purging and meeting the demands of continuous, large-scale production.
2.High batch consistency—the fluctuation of active ingredients between batches is minimal, so customers do not need to repeatedly adjust extruder parameters such as temperature and screw speed, which greatly reduces material loss during changeover and keeps product quality stable.
3.Strong formulation compatibility— when compounded with common PVC additives such as ACR processing aids, MBS impact modifiers and calcium carbonate fillers, the fluctuation in plasticizing time stays within 15%, and abnormal spikes in extrusion torque or unstable main-motor current do not occur.
4.Convenient powder handling — free from the volatilization, stratification and metering inaccuracies of liquid stabilizers; it disperses uniformly within 3–5 minutes in a high-speed mixer without caking, and keeps the workshop environment cleaner.
2.Outstanding weathering performance—formulated with dedicated anti-aging components, it durably inhibits discoloration and property loss in outdoor profiles and pipes, prevents the copper-contact staining that can occur in service, and extends the outdoor service life of the finished article.
Applications
1.Rigid PVC: UPVC water supply and drainage pipes, fittings, door and window profiles, wall panels, ceiling panels and extruded sheets.
2.Semi-rigid PVC: cable sheathing compounds, decorative films, corrugated pipes and injection-molded fittings.
3.Special compliance applications: food-contact PVC articles, compounds for children's toys, low-smoke halogen-free cable compounds and other applications with strict environmental requirements.
Recommended Usage
Dosage: depending on the end product, the recommended dosage is 1.2–2.5 phr (per 100 parts of PVC resin); for pipes and profiles, 1.8–2.2 phr is typical.
Mixing procedure: charge this product together with the other additives and fillers into the high-speed mixer and premix for 5–8 minutes. Discharge when the batch temperature reaches 110–120 °C, cool below 40 °C, and transfer to the subsequent extrusion stage for optimum dispersion.
Processing note: the processing window of this product is slightly narrower than that of conventional lead-based stabilizers. It is recommended to lower the barrel temperature settings of the existing extruder by 3–5 °C, which effectively prevents late-stage "zinc burning" and further improves the whiteness and surface gloss of the finished article.
Packaging，Storage& Shelf life
Packaging: 25 kg/bags,16tons/20’GP
Storage conditions: store in a dry, cool and well-ventilated warehouse at 60–65% relative humidity and 10–35 °C. Keep out of direct sunlight and never store in the open air.
Shelf life : 12 months under normal sealed storage.
Technical Service
WSD CHEMICAL provides full-cycle technical support to all customers. Based on your equipment conditions, end products and formulation system, we can develop tailor-made dosage optimization plans and provide processing and troubleshooting guidance, helping you complete a smooth transition from conventional stabilizers to an eco-friendly calcium-zinc system and resolve practical issues such as insufficient heat stability or uneven plasticization.
1. it is powder solid non-toxic heat stabilizer
2. mainly used on pvc pipe, fitting, foam board,pvc sheet, pvc compound
3. SGS and Rohs standard