02/12/2025
Types of Calcium Carbonate Used in PVC Pipes
The PVC pipe industry utilizes two primary forms of calcium carbonate:
Ground Calcium Carbonate (GCC): Produced by mechanically grinding natural limestone, marble, or chalk into fine powders. GCC is primarily used as an economical filler to reduce material costs .
Precipitated Calcium Carbonate (PCC): Manufactured through a chemical process that converts limestone into calcium oxide, then calcium hydroxide, and finally reacts it with carbon dioxide to precipitate pure CaCO₃ crystals. PCC offers superior performance characteristics due to its :
Smaller, more uniform particle size (20-70 nanometers)
Regular crystal shapes
Narrow particle size distribution
Surface treatments (often with fatty acids like calcium stearate)
Higher purity levels
