Yellowing during PVC cable compound processing is commonly related to insufficient thermal stability, excessive processing temperature, long residence time, or localized overheating caused by shear.
Improvement can be achieved through optimization of heat stabilizer selection, processing conditions, and lubricant balance.
Suitable calcium-zinc stabilizers help suppress thermal degradation during processing and improve both initial color and long-term color stability. When used together with an appropriate amount of PE Wax, adhesion to metal surfaces can be reduced, minimizing material build-up and localized overheating.
JUYEE provides calcium-zinc stabilizers and PE Wax solutions for wire and cable applications, helping customers balance color performance, heat stability, and processability.
PVC brittleness is often associated with insufficient fusion, processing degradation, excessive filler loading, poor dispersion, insufficient impact modification, or inadequate weld-line strength.
For flexible PVC products, plasticizer dosage, low-temperature flexibility, and possible plasticizer loss through volatilization or migration should also be considered.
Rigid PVC can improve toughness through optimization of fusion, filler systems, and impact modifiers. Flexible PVC can maintain softness by selecting plasticizers with appropriate compatibility and durability.
JUYEE supplies plasticizers, PVC stabilizers, lubricants, and dispersing agents to help improve flexibility, processing uniformity, and long-term durability.
Copper discoloration is usually caused by oxidation or sulfide reactions on the copper surface.
Moist storage conditions, sulfur-containing contaminants, elevated processing temperatures, and prolonged exposure can accelerate discoloration. When PVC undergoes thermal degradation, released hydrogen chloride (HCl) may further promote copper corrosion in the presence of moisture.
Prevention measures include proper copper cleaning, moisture control, contamination reduction, improved PVC thermal stability, and suitable copper corrosion inhibitors.
Benzotriazole (BTA) can form a protective film on copper and copper alloys, helping reduce corrosion and maintain appearance and performance.
JUYEE’s copper corrosion inhibitor products are primarily based on BTA and can be used in wire and cable applications together with PVC stabilizers.
Halogenated flame-retardant systems typically utilize bromine- or chlorine-containing compounds to interrupt flame propagation in the gas phase, providing high flame-retardant efficiency.
Halogen-free systems utilize phosphorus-based, nitrogen-based, or inorganic mineral flame retardants. These materials help reduce combustion through mechanisms such as char formation, endothermic decomposition, and the release of water vapor or carbon dioxide.
For wire & cable, electronics, and public-space materials, low-smoke halogen-free formulations can be designed according to performance requirements.
JUYEE offers LKAB UltraCarb inorganic flame retardants and phosphorus-based flame-retardant solutions for various flame-retardant applications.
UL 94 V-0 is a vertical burning classification used to evaluate the self-extinguishing behavior and dripping characteristics of plastic materials.
Key requirements include:
- After each flame application, burning time must not exceed 10 seconds.
- Total flaming time for ten flame applications must not exceed 50 seconds.
- Combined flaming and glowing time after the second ignition must not exceed 30 seconds for each specimen.
- Burning drips must not ignite the cotton indicator below.
Achieving a V-0 rating typically involves appropriate flame-retardant packages, synergists, resin selection, dispersion quality, and dripping control.
LKAB UltraCarb supplied by JUYEE can contribute to flame retardancy through endothermic decomposition and formation of a protective surface layer and may be combined with other flame-retardant components depending on formulation requirements.
Test Video: Inorganic Flame Retardant Technical Experiment: UL 94 V-0 Standard Testing
Pigments, fillers, and functional powders may gradually settle due to density differences between solid particles and the liquid medium.
Large particle size, agglomeration, inadequate wetting and dispersion, or insufficient rheological structure can accelerate settling and negatively affect storage stability.
Suitable rheology modifiers and anti-settling agents help maintain particle suspension while still allowing good flow characteristics during mixing, coating, or application.
JUYEE’s CMT organoclay series provides thickening, anti-settling, and anti-sagging performance for coatings, inks, adhesives, and other formulations.
Internal lubricants reduce internal flow resistance within the PVC melt and improve melt flow behavior.
External lubricants reduce adhesion between the material and metal processing equipment, improving mold release and reducing material build-up.
Proper balancing of internal and external lubrication helps optimize fusion, flow behavior, surface quality, and long-term processing stability.
JUYEE offers various PE Wax and processing lubricant solutions suitable for both rigid and flexible PVC applications.
Surface blooming may appear as oily residues, haze, or powdery deposits and is often related to additive compatibility, excessive additive loading, lubrication imbalance, or inadequate fusion.
Plasticizers, lubricants, and stabilizer components may gradually migrate to the surface during storage, heating, or contact with other materials.
Improvement measures include selecting additives with better compatibility, optimizing lubrication balance, and improving fusion uniformity.
JUYEE supplies plasticizers, PVC stabilizers, and PE Wax products to help improve surface cleanliness, appearance, and processing stability.
CPVC is produced by post-chlorination of PVC resin, resulting in higher chlorine content and improved heat resistance.
PVC is widely used in water supply systems, profiles, and various flexible and rigid products. CPVC offers enhanced heat resistance and chemical resistance, making it suitable for hot water systems, chemical piping, fittings, and higher-temperature industrial fluid handling.
JUYEE provides calcium-zinc stabilizer solutions for both PVC and CPVC applications, helping improve thermal stability, color retention, and processing performance.