Jiangsu Uniwel Chemistry Co., Ltd. was founded in 1991. It is a New High-tech enterprise that specializes in research, production, and sales of PVC stabilizers. After more than 30 years of development, the company has become the leading enterprise in the PVC stabilizer industry. Lead-Based Stabilizer Manufacturer and Lead-Based One-Pack Heat Stabilizer Factory in China.

The company has passed ISO 9001 quality system certification and ISO14001 environmental management system certification. Through continuous innovation and development, the company has acquired a number of invention patents and utility model patents. The main product of our company is a variety of PVC heat stabilizers, including Ca/Zn stabilizer, Ba/Zn stabilizer, Ba/Cd/Zn stabilizer, K/Zn stabilizer and so on, which can be widely used in PVC products such as window profiles, pipes &pipe fittings, indoor decoration boards, rigid foamed boards, SPC floorings, films, leathers, wires&cables and so on. The product has excellent heat stability, processingability, strong adaptability, and a wide range of processing, endowing excellent physical and mechanical properties to the products. Wholesale Lead-Based PVC Stabilizer. The six major series of products have been awarded the title of New High-tech products, using the most advanced chemical technology to provide the best quality product for the PVC products industry.

In order to adapt to the global green development trend, the company has developed good techniques, high-cost performance of Ca/Zn composite and organic composite environmentally friendly stabilizers, to meet the PVC extrusion, injection moulding, calendering, foaming products demand, and provide a variety of solutions for product upgrade for the customers.

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Why Choose a Lead-Based One-Pack Heat Stabilizer System?

In many rigid PVC processing lines, separate weighing of stabilizer, lubricants, and co-stabilizers leads to inconsistencies and dust exposure. A Lead-Based One-Pack Heat Stabilizer integrates all required additives into a single, homogeneous granule, eliminating multi-component handling and reducing the risk of human error. This all-in-one approach ensures uniform dispersion and consistent thermal protection throughout every batch.

Parameter

Traditional Multi‑Component

One‑Pack System

Dust generation

High

Very low

Weighing accuracy

Prone to error

Consistent, single addition

Dispersion uniformity

Variable

Excellent

Storage space

Multiple silos/containers

Single container

Changeover time

Longer

Fast

Comparison of traditional multi‑component stabilizer handling with an integrated one‑pack system

At Jiangsu Uniwel Chemistry Co., Ltd., our Lead-Based One-Pack Heat Stabilizer is formulated with an optimized lubricant balance specifically designed for window profile and pipe extrusion. Customers report reduced plate-out and significantly extended continuous running times compared to conventional stabilizer packages.

Maximizing Output with Lead-Based PVC Stabilizer in Extrusion

Achieving optimal fusion and low melt viscosity is critical in high‑speed extrusion of rigid profiles. The Lead-Based PVC Stabilizer system not only provides thermal protection but also directly influences fusion torque and metal release, making it a key factor in line speed and surface quality. Proper matching of the stabilizer’s lubricant component to the extruder’s shear profile prevents both over‑plastication and premature degradation.

Key Processing Parameters

Barrel temperatures: typically 160–190 °C (zones 1–4)

Die temperature: 190–205 °C; exceeding 205 °C melt temperature can initiate dehydrochlorination

Fusion time (torque rheometer): 60–120 s for medium‑shear formulations

Equilibrium torque: 8–15 N·m indicates good fluxing without excessive shear heating

Vacuum venting: maintain at least −0.06 MPa to remove volatiles and avoid bubbles

Jiangsu Uniwel’s Lead-Based PVC Stabilizer grades are engineered for a wide processing window and low energy consumption. By minimising friction and promoting controlled fusion, these stabilizers help extruders push line speeds higher while maintaining excellent gloss and dimensional stability.

The Role of Lead Stabilizer in PVC Long‑Term Heat Stability

The primary mechanism of a Lead Stabilizer in PVC is the irreversible scavenging of hydrogen chloride (HCl) released during thermal stress. Unlike some organic stabilizers, lead compounds form stable, non‑volatile lead chlorides that do not catalyse further decomposition. This means the stabilizer permanently locks up the destructive acid, providing exceptionally reliable long‑term stability even under prolonged high‑temperature exposure.

Common Lead‑Based Components and Their Functions

Tribasic lead sulfate (TBLS) – excellent long‑term heat stability, primary HCl acceptor

Dibasic lead phosphite (DBLP) – outstanding UV shielding and weather resistance

Lead stearate – internal lubricant and co‑stabilizer, improves early colour

Dibasic lead phthalate – used in plastisols and flexible applications for superior electricals

For outdoor profiles and pipes, combining a Lead Stabilizer in PVC with dibasic lead phosphite creates a synergistic effect that simultaneously neutralises HCl and screens UV radiation, extending service life by 30–50% compared with formulations lacking a dedicated light stabiliser. We at Jiangsu Uniwel formulate our Lead Stabilizer in PVC systems with precisely balanced component ratios to meet the demanding lifetime expectations of building and construction products.

Safe Handling and Dust‑Free Production with Lead-Based Stabilizer

Occupational exposure to lead‑containing dust is a critical concern in PVC compounding plants. Modern Lead-Based Stabilizer products are increasingly supplied in compacted, dust‑free microgranule or pastille form. This physical form eliminates the fine airborne particles typically generated when scooping and weighing traditional powders, substantially improving industrial hygiene and worker safety.

Industrial Hygiene Benefits of Dust‑Free Granules

Reduces lead‑in‑air concentration by up to 98% versus fine powders

Enables straightforward vacuum conveying without filter blinding

Prevents caking and bridging in storage silos, ensuring uninterrupted feeding

Simplifies compliance with ISO 14001 and occupational exposure limits

At Jiangsu Uniwel Chemistry Co., Ltd., our Lead-Based Stabilizer manufacturing has been optimised to produce free‑flowing granules that generate minimal dust during every handling step, from packaging to the extruder hopper. This commitment aligns with our ISO 14001‑certified environmental management system and helps customers maintain a cleaner, safer production environment without sacrificing thermal performance.