Why Black Silicone Rubber Products Can't Resist High Temperature Carbon black is mainly composed of carbon, and contains a small amount of hydrogen, oxygen, nitrogen, sulfur, metal and other elements, these small amounts of hydrogen, oxygen, nitrogen, sulfur, metal and other elements.
Main chemical constituents of carbon black:
The content of carbon/carbon (C) elements (Wt%) is more than 93%.
The content of oxygen group (Wt%) is less than 7%.
Usually the chemical composition of carbon black products is these, but the chemical composition of different carbon black products will change, but the change is not very big.
What are the impurities in carbon black? 
Carbon black is not a pure substance. Carbon is the main component of carbon, and contains a small amount of hydrogen, oxygen, nitrogen, sulfur, metal and other elements. These impurity elements mainly exist in the form of hydroxyl, carbonyl, amino or cyanogen.
Carbon black is mainly produced by incomplete combustion or thermal decomposition of carbon-containing materials (coal, natural gas, heavy oil, fuel oil, etc.) under the condition of insufficient air. Incomplete combustion, oh, so it's not pure, nor is the pigment carbon black.