1. Physical Properties
Surface Area: The surface area as Absorbent Powder And Thickening Agent of precipitated silica typically ranges between 150 m²/g to 400 m²/g. Higher surface area values can enhance reinforcement characteristics.
Particle Size Distribution: Smaller particles tend to provide better reinforcement and consistency in mechanical properties, but they may also influence processing parameters such as viscosity and flow.
Morphology: The shape of silica particles (fibrous, spherical, or irregular) can significantly affect reinforcement and processing characteristics.
2. Reinforcement Characteristics
Strength Improvement: Using precipitated silica enhances the tensile strength and tear resistance of polymer compounds, making them more durable for high-stress applications.
Elastic Modulus: Precipitated silica contributes to improved elasticity, which is critical for wire and cable that experience bending and flexing during use.
3. Thermal and Chemical Stability
Thermal Resistance: Choose silica that maintains properties at elevated temperatures typical in cable operation to prevent degradation.
Chemical Resistance: Evaluate the silica’s resistance to various chemicals, especially oils and solvents, that may be encountered in environmental conditions.
4. Electrical Properties
Dielectric Strength: Precipitated silica can enhance the dielectric properties of cables, offering good insulation and preventing electrical breakdowns.
Insulating Properties: Ensure that the silica used does not conduct electricity, maintaining the cable’s overall insulation integrity.
5. Processing Characteristics
Dispersion Efficiency: The ease of incorporating silica into polymer matrices without agglomeration impacts the overall processing and mechanical properties.
Rheological Behavior: Silica can modify the viscosity of compounds. Choosing the right silica helps achieve optimum flow during manufacturing processes like extrusion and injection molding.
6. Moisture Absorption and Performance
Hydrophilicity: Some precipitated silicas have inherent moisture affinity, which can influence the final product's moisture susceptibility and may need to be countered with additives.
Impact on Water Absorption: Investigate how the silica affects the overall water absorption of the cable material, as excessive moisture can compromise performance.
7. Aging Resistance
UV Stability: Withstand degradation from UV exposure, essential for outdoor applications.
Thermal Aging: Ensure the material maintains its performance characteristics over its operational life when exposed to heat.
8. Cost-Effectiveness
Performance vs Cost: Evaluate the silica’s performance benefits relative to its cost to ensure economic feasibility.
Long-term Performance: Consider the implications of choosing lower-cost alternatives versus potential long-term failures leading to higher replacements and maintenance costs.
9. Regulatory Compliance
Certifications: Ensure that the chosen precipitated silica complies with relevant safety and environmental regulations (e.g., RoHS, REACH).
Toxicity Data: Evaluate the safety data for handling and processing, ensuring compliance for worker safety and environmental impact.
10. Supplier Support and Quality
Technical Support: Look for suppliers who can provide technical data, samples for testing, and ongoing support for formulation adjustments.
Quality Control: Ensure the supplier has stringent quality control processes to guarantee consistent material performance.
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