1. Description of WELLSTAB™ series PVC Compound Stabilizer

PVC stabilizers are used to prevent degradation of polyvinyl chloride (PVC) by heating, oxygen and ultraviolet, etc. especially during processing, but also in applications.

The choice of stabilizers depends on processing technologies, cost, relevant legal restrictions and requirements of the finished PVC products. By combining with lubricants, auxiliary stabilizers, antioxidants, anti-ultraviolet agents and other additives, our stabilizer portfolio provides suitable and efficient solutions for a variety of PVC processing requirements.

WELLSTABTM is the trade name of SUNDOW stabilizer and is sold in the form of a compound stabilizer (One-Pack). It can be precisely adjusted according to the performance requirements of the final product to meet a very wide range of product and performance requirements.

There are three main series of WELLSTAB™ stabilizers:

Ø  WELLSTAB™ SP series ---lead based compound stabilizers

Ø  WELLSTAB™CZ series --- calcium-zinc based compound stabilizers

Ø  WELLSTAB™ST series --- Organic Tin stabilizers

2. WELLSTAB™ SP series——Lead based compound stabilizers

Lead based compound stabilizers are generally used in combination with lead soaps, calcium soaps, lubricants and antioxidants, etc. They can be used in PVC pipes, fittings, profiles, decorative panels, boards, shutters, wire & cables, etc.

u  WELLSTAB™ SP series products

Table 1 the selection guide of SP series for PVC products

Remark：Above is just part of our grades, if you want to know further information or more grades, please contact info@sundow.com.

u  The major properties of lead based compound stabilizers include:

• Excellent heat stability

• Good electrical properties

• Excellent light resistance

• Wide processing window

• Good cost-performance

• No detrimental effects on the Vicat softening temperature of rigid PVC

• Low solubility in water, no leaking into the environment

• No odor during processing and in the final product

• Low water absorption

• Lead compounds are chronically toxic to biology

• Not suitable for transparent products, discolour in contact with sulphur-containing compounds

u  Application

They can be used in PVC pipes, fittings, profiles, decorative panels, boards, shutters, wire & cables, etc

3. WELLSTAB™ CZ series——Ca/Zn based compound stabilizers

Ca-Zn based compound stabilizers are made by combining Ca-Zn salt stabilizers with auxiliary stabilizers, lubricants, anti-oxidants, anti-ultraviolet agents and other additives. In general, they are in powder form. Calcium Zinc Stabilizers are also suitable for nontoxic and food grade PVC items that require FDA and/or similar approval, under food regulatory acts.

u  WELLSTAB™ CZ series products

Table 2 the selection guide of CZ series for UPVC products

Table 3 the selection guide of CZ series for PVC Wires & Cables

Remark：Above is just part of our grades, if you want to know further information or more grades, please contact info@sundow.com.

u  The major properties of PVC compounds incorporating Ca-Zn based compound stabilizers include:

Ø   Environment-friendly, no harmful and no heavy metal, safe and sanitary

Ø   Good mechanical and electrical properties

Ø   Good initial color and excellent long-term stability

Ø   Excellent organoleptic properties and good outdoor weatherability

Ø   Suitable for transparent products

Ø   No sulphur-staining

Ø   Good thermal stability

Ø   Lower density than that of lead based stabilizers

Ø   No polluting, not react with lead salt, organotin and other heat stabilizers

u  Application

They are largely used in PVC pipe & fitting, profile, electric wire and cable, artificial leather, medical tube and part, flooring, footwear, film, board/sheet and many other applications.

4.WELLSTAB™ ST series——Organic Tin stabilizers

Organic Tin stabilizershave high efficient heat stability, excellent initial coloring, high-temperature color stability and long-term dynamic stability. It is suitable for all kinds of process of flexible and rigid PVC, such as calendaring, extrusion, injection and blow molding, etc.

u  WELLSTAB™ ST series products

Remark：Both ST-190 and ST-191 are methyl tin mercaptide. If you want to know further information or more grades, please contact info@sundow.com.

u  Application

²  PVC film (thermal shrinking packaging film, printing film, calendared film, twisting film);

²  PVC sheet (clear flexible and rigid sheet, X’mas sheet, advertisement sheet, compound sheet);

²  PVC granule (granule, shell of electronic apparatus);

²  PVC building materials (water pipe and pipe fittings, chemical pipes, construction materials, profile);

²  PVC medical apparatus (transfusion device), food packaging materials, daily-used appliances and others.