The appearance of calcium and zinc stabilizer is mainly white powder, flake and paste. Powdered calcium and zinc stabilizers are used as the most widely used non-toxic PVC stabilizers, commonly used in food packaging, medical equipment, wire and cable materials, etc. At present, PVC calcium-zinc stabilizers that can be used for rigid pipes have appeared in China.
The thermal stability of powdered calcium-zinc stabilizer is not as good as that of lead salt, and it has the characteristics of certain lubricity, poor transparency, and easy frosting. In order to improve its stability and transparency, antioxidants such as hindered phenols, polyols, phosphites and β-diones are often added.
The two major systems of calcium-zinc stabilizer are mainly divided into hydrotalcite system and zeolite system.
The price of powdered calcium-zinc stabilizers is uneven, and there is no standardized national standard to regulate it.