Acid and alkali resistant rubber joints, as the name suggests, are primarily corrosion-resistant rubber joints. However, these joints are not suitable for all types of corrosive pipelines; they have limitations. They cannot be used in high-concentration acid or alkali environments. Therefore, the acid and alkali concentrations that acid and alkali resistant rubber joints can stand must be clearly understood.
Acid and alkali concentration determines the degree of corrosiveness of the medium. We classify them into PN values between 0 and 14, with higher values indicating higher concentrations. A pH value greater than 7 indicates a very high concentration. Therefore, if our acid and alkali resistant rubber joints were also expressed numerically, they could only withstand a maximum pH value of 7. They would struggle to survive in highly concentrated acid or alkali solutions.
Therefore, the acid and alkali concentration of the medium must be accurately determined before using acid and alkali resistant rubber joints. When using high-concentration media, the acid and alkali resistant rubber joints need to be further processed. For example, a layer of polytetrafluoroethylene (PTFE) plate can be added to the inner wall of the sphere. This plate has excellent corrosion resistance and high-temperature resistance, and ordinary media cannot damage it. Therefore, PTFE-lined rubber joints are currently recommended for use in some special pipelines. PTFE-lined joint rubbers in corrosive pipelines, their performance should be compared to see which one has a higher cost-performance ratio before use.
