Silicone rubber compound are repeatedly mixed by adding silicone rubber color masterbatch or toner on the open mixing mill. In the mixing process, we need to repeatedly mix evenly before they can be use. If the mixing is uneven, obvious color marks will appear in the silicone rubber products.

At present, most manufacturers of color silicone rubber compound usually send the color that customer provide to the color paste manufacturer for color matching, formulate the silicone rubber color masterbatch of the corresponding color, and then color it. Although this method is simple, the cost is relatively high. The professional manufacturers of rubber compound usually have independent color matching ability, and only make ideal colors through repeated mixing of several basic colors. This method can greatly save production costs and avoid unnecessary cost.

In addition, we can add toner to make the color we want, but this method is difficult and is not recommended. Because the toner ingredient of various colors are different, the particle mesh size is also different. The lower the mesh number, the larger the particle size. It is not easy to mix evenly with silicone rubber compound , which is easy to cause color marks on the surface of raw materials. The finer  particles of high mesh toner is easier to mix in the mixing of silicone rubber raw materials, but the cost is higher.

Generally speaking, adding silicone rubber color masterbatch directly to silicone rubber compound is the most convenient method. In the process of adding toner, it is easy to cause toner flying, make the addition proportion error, affect the color appearance, and easily cause workshop pollution. Therefore, adding toner to silicone rubber compound is not recommended.