Parameter | Description/Range |
Particle Size | Typically in the range of 50-500 nanometers (nm), ultra-fine calcium carbonate powder offers a high degree of dispersion and surface area, enhancing its reinforcing effect in rubber compounds. |
Particle Shape | Available in various shapes such as cubic, hexagonal, or needle-like. The shape can influence the processing characteristics and final properties of the rubber, such as hardness, tensile strength, and abrasion resistance. |
Specific Surface Area | High, typically ranging from 10-50 m²/g. The larger surface area allows for better interaction with the rubber matrix, leading to improved filler dispersion and bonding. |
Chemical Composition | Primarily calcium carbonate (CaCO₃) with high purity levels, typically above 98%. Trace impurities such as magnesium, silicon, and iron oxides may be present, but their levels are tightly controlled to avoid adverse effects on rubber properties. |
Oil Absorption Value (OAV) | Measures the ability of the powder to absorb oil, which is related to its porosity and surface area. OAV typically ranges from 20-50 g/100g, influencing the viscosity and processability of rubber compounds. |
Bulk Density | Varies depending on particle size and shape, typically ranging from 0.5-1.5 g/cm³. Bulk density affects the handling and blending efficiency of the powder in rubber production processes. |
Moisture Content | Low, typically below 0.5%. Moisture can adversely affect the dispersion and bonding of the filler in rubber, so it is carefully controlled during production and storage. |
pH Value | Generally neutral, ranging from 6.5-8.5. Neutral pH ensures compatibility with most rubber formulations and avoids potential chemical reactions that could degrade rubber properties. |
Surface Treatment | Often treated with stearates, fatty acids, or other surfactants to improve dispersion and compatibility with rubber. Surface-treated calcium carbonate can enhance the processing characteristics and final properties of rubber compounds. |
Color and Whiteness | Ultra-fine calcium carbonate powder is typically white or near-white, with a whiteness index ranging from 85-95%. Color consistency is important for applications where visual appearance is a critical factor. |
1. Enhanced Durability and Strength: Ultra-fine calcium carbonate powder significantly boosts the tensile strength and durability of rubber compounds. Its nano-scale particles ensure tight packing within the rubber matrix, reducing porosity and increasing resistance to wear and tear. This makes it ideal for applications requiring high durability, such as automotive tires, conveyor belts, and industrial hoses.
2. Improved Processing Efficiency: Incorporating ultra-fine calcium carbonate powder into rubber formulations facilitates smoother and more efficient processing. Its fine particle size ensures better dispersion and mixing, reducing the energy consumption during compounding and extrusion processes. This not only enhances productivity but also lowers overall manufacturing costs.
3. Excellent Dimensional Stability: Rubber filled with ultra-fine calcium carbonate powder exhibits superior dimensional stability. The filler particles help to maintain consistent shape and size under varying temperatures and pressures, making it perfect for precision-engineered rubber parts like seals, gaskets, and O-rings.
4. Enhanced Chemical Resistance: The chemical inertness of calcium carbonate makes it an excellent barrier against aggressive chemicals. When used as a filler, it significantly improves the rubber's resistance to acids, bases, and other corrosive substances. This is crucial for applications in the chemical processing, mining, and food handling industries.
5. Cost-Effective Replacement for Traditional Fillers: Ultra-fine calcium carbonate powder offers a cost-effective alternative to traditional fillers like talc and clay. It provides comparable or superior performance while being more abundant and less expensive to source. This makes it an attractive option for buyers seeking to optimize their production costs without compromising quality.
6. Customizable Properties: The particle size, shape, and surface treatment of ultra-fine calcium carbonate powder can be tailored to meet specific application needs. This versatility allows rubber formulators to fine-tune the material's properties, achieving the perfect balance of hardness, flexibility, and other critical characteristics.
7. Sustainable and Eco-Friendly: Sourced naturally from limestone or marble, ultra-fine calcium carbonate powder is a renewable and eco-friendly material. Its use in rubber products supports sustainable manufacturing practices and reduces the environmental footprint of rubber compounds.
