PVC compound modifications requirements involves knowing the specific needs of the application and the corresponding properties that need to be enhanced or achieved. Here are the general categories of requirements for PVC compound modifications:

1. Mechanical Properties

• Flexibility: Adjusting flexibility using plasticizers for applications like cables, hoses, and flexible tubing.
• Hardness: Balancing the hardness with additives for rigid applications such as pipes, profiles, and fittings.
• Impact Resistance: Enhancing impact strength for products exposed to mechanical stress like automotive parts and sporting goods.
• Tensile Strength: Increasing tensile strength for applications requiring durability and load-bearing capacity.

2. Thermal Properties

• Thermal Stability: Using stabilizers to prevent degradation at high processing temperatures.
• Heat Resistance: Adding heat stabilizers for applications exposed to high temperatures such as electrical conduits and automotive interiors.
• Cold Resistance: Ensuring flexibility and toughness at low temperatures for outdoor and refrigeration applications.

3. Chemical Properties

• Chemical Resistance: Improving resistance to chemicals and solvents for applications like chemical storage tanks and lab equipment.
• Weatherability: Enhancing resistance to UV light, ozone, and other environmental factors for outdoor applications like window profiles and roofing membranes.

4. Electrical Properties

• Insulation: Adding electrical insulating properties for applications in wiring and electrical components.
• Conductivity: Introducing conductive additives for antistatic or electrically conductive applications.

5. Flame Retardancy

• Flame Resistance: Incorporating flame retardants for applications in construction, transportation, and electronics where fire safety is critical.

6. Aesthetic Properties

• Color: Customizing color with pigments and colorants for branding and aesthetic requirements.
• Transparency: Modifying clarity for applications like medical devices and food packaging.

7. Processability

• Flow Properties: Adjusting the flow properties to enhance ease of processing during extrusion, injection molding, or blow molding.
• Stability: Ensuring stability during processing to avoid degradation and maintain consistent quality.

8. Regulatory Compliance

• Safety Standards: Meeting safety standards such as RoHS, REACH, FDA, and other relevant regulations for specific industries.
• Environmental Standards: Ensuring environmental compliance with regulations regarding plasticizers and other additives.