The difference between hard carbon black and soft carbon black
Among the standard rubber carbon blacks, those below N500 are hard carbon blacks. The use of this kind of carbon black is mainly for its reinforcing effect after rubber processing, increasing the wear resistance and tensile strength of the rubber and other parameters. For example, hard carbon black is used for tread rubber. Including N500 and above until N990, etc. are all soft carbon blacks. The rubber processed with this carbon black pays more attention to other properties of the rubber, including air tightness, smoothness, etc.
Process difference between hard carbon black and soft carbon black
In the carbon black production process, the carbon black produced by the contact method and most of the carbon black produced by the oil furnace method will be called hard carbon black. Carbon black produced by gas furnace method and thermal cracking method and a small part of carbon black produced by oil furnace method also belong to soft carbon black.
The difference between soft carbon black and hard carbon black
In rubber products, the carbon black with reinforcement as the main function is called hard carbon black compared with soft carbon black; while in rubber products, the reinforcing effect is poor and plays a role to a large extent. The carbon black used for filling is soft carbon black. That is to say, the role of hard carbon black is mainly reinforcing, while the reinforcing effect of soft carbon black is poor and mainly filling.
How to distinguish between hard carbon black and soft carbon black
Hard carbon black, also known as tread carbon black, refers to the carbon black whose main function is reinforcement in rubber products, which is relatively soft carbon black. The standard average particle size is in the range of 11 to 45 nm, and most of the carbon black produced by the contact method and the oil furnace method are also hard carbon black. Usually, rubber carbon blacks below N500 are hard carbon blacks.
Soft carbon black, also known as matrix carbon black, refers to the carbon black that has poor reinforcing effect in rubber products and plays a filling role to a large extent, which is relatively hard carbon black. The standard average particle size is in the range of 45-500 nm. Carbon black produced by gas furnace method and thermal cracking method and a small part of carbon black produced by oil furnace method also belong to soft carbon black. Usually, including N500 and above until N990, etc. are all soft carbon blacks.