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
Wellstab™ Grade | Appearance | PbO Content (%) | Recommended Dosage(phr) | Product Features | Typical Application |
SP-500 | White or yellowish flake | 28.0±1.0 | 1.5-5.5 | Good thermal stability and lubrication effect; good weather resistance and good whitening effects | PVC pipes |
SP-603 | White or yellowish flake | 35.0±1.0 | 3.5-6.5 | Good thermal stability and lubrication effect; Good demoulding and quick plasticizing | PVC fittings |
SP-102H | White or yellowish flake | 36.0±1.0 | 4.0-6.0 | Good thermal stability and lubrication effect; good processability and chemical stability; high Pb content | Outdoor PVC profiles |
SP-102L | White or yellowish flake | 29.0±1.0 | 2.0-5.0 | Good thermal stability and lubrication effect; good weather resistance and good whitening effects; low Pb content | Indoor PVC profiles |
SP-202F | White or yellowish flake | 32.0±1.0 | 2.5-6.5 | Good thermal stability and lubrication effect; good processability and chemical stability | PVC foam boards |
SP-900 | White or yellowish flake | 31.5±1.0 | 5.0-7.0 | Good processability and aging resistance | 70℃ insulated and sheathed cables & wires |
SP-901 | White or yellowish flake | 40.0±1.0 | 5.0-7.0 | Good thermal stability and aging resistance | 90-105℃ insulated and sheathed cables & wires |
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
Wellstab™ Grade | Appearance | Recommended Dosage(phr) | Product Features | Typical Application |
CZ-505S | White or yellowish Powder | 3.5-5.5 | General grade. Excellent initial coloring; Good thermal stability and lubricant effect; Excellent dispersibility | PVC water supply pipes |
CZ-505D | White or yellowish Powder | 2.5-4.5 | Good thermal stability and lubricant effect; Excellent initial coloring | PVC draining pipes |
CZ-506 | White or yellowish Powder | 4.5-6.4 | Good thermal stability and lubricant effect; Excellent initial coloring and color stability; Good demoulding and quick plasticizing | PVC fittings |
CZ-507W | White or yellowish Powder | 4.0-5.0 | Good thermal stability and lubrication effect; Excellent UV resistance | PVC window profiles |
CZ-507E | White or yellowish Powder | 4.0-6.0 | Good thermal stability and balanced internal and external lubrication | PVC edge banding |
CZ-508F | White or yellowish Powder | 3.0-10.0 | Good thermal stability and lubricant effect; excellent dispersibility | PVC foaming boards |
CZ-508W | White or yellowish Powder | 3.0-5.0 | Good thermal stability and coloration | PVC WPC, SPC, etc |
Table 3 the selection guide of CZ series for PVC Wires & Cables
Wellstab™ Grade | Appearance | Recommended Dosage(phr) | Product Features | Typical application |
CZ-501A | Powder | 3.0-6.0 | Good thermal stability and initial coloring, meet the standard requirement of UL70℃ | For 70℃ light color wire/cable |
CZ-501B | Powder | 3.0-6.0 | Good thermal stability and initial coloring, meet the standard requirement of UL70℃ | For 70℃ dark color wire/cable |
CZ-502A | Powder | 3.0-6.0 | Good thermal stability and initial coloring, meet the standard requirement of UL90℃ | For 90℃ light color wire/cable |
CZ-502B | Powder | 3.0-6.0 | Good thermal stability and initial coloring, meet the standard requirement of UL90℃ | For 90℃ dark color wire/cable |
CZ-503A | Powder | 6.0-10.0 | Excellent thermal stability and initial coloring, meet the standard requirement of UL105℃ | For 105℃ light color wire/cable |
CZ-503B | Powder | 6.0-10.0 | Excellent thermal stability and initial coloring, meet the standard requirement of UL105℃ | For 105℃ dark color wire/cable |
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
Item | Unit | ST-190 | ST-191 |
Appearance | / | Clear Liquid | Clear Liquid |
Tin content | % | 19.0±0.5 | 17.5±0.5 |
Color (Pt-Co) | / | ≤50 | ≤50 |
Density (25℃) | g/cm3 | 1.15-1.20 | 1.15-1.20 |
Viscosity (25℃) | mPa.S | ≤110 | ≤110 |
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.
