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Is EPDM flexible joint suitable for sulfuric acid medium

Time: 05-18 󰃯 Reading times: 551 󰃳 Editor in charge: The sea 󰃗 Column: product focus

Introduction: Whether EPDM flexible joint can be used in liquid medium with 20% sulfuric acid concentration? Recently, customer's feedback on rubber joint products: can rubber joint products be used in sulfuric acid liquid pipeline with low concentration. Take this case to illustrate the oak

EPDM Rubber flexible joint Can it be applied to liquid medium with 20 sulfuric acid concentration Rubber joint Product consultation feedback: can rubber joint products be used in sulfuric acid liquid pipeline with low concentration.
Take this case to illustrate the corrosion resistance of rubber joints. Rubber soft joint is generally divided into NBR, chloroprene rubber and EPDM according to rubber properties. NBR is oil resistant and aging resistant. Chloroprene rubber is heat resistant,
Flame retardant, sunlight resistance, reactive oxygen species resistance, chemical resistance, outstanding performance. EPDM is characterized by acid, alkali and corrosion resistance. The properties of neoprene and neoprene can be described here.
The key point is ethylene propylene diene monomer (EPDM) which can be applied to sulfur liquid. EPDM flexible joint is suitable for weak acid and weak alkali liquid. The structure and processing technology of EPDM joint are 5 or 6 layers of rubber layer and cord fabric,
The inner layer and outer layer of the ball are EPDM rubber, the other layers are general rubber layer and cord fabric. The structure of EPDM joints in China is almost like this. It can be said that EPDM rubber is used in all adhesive layers, which is only a liquid medium that can resist weak acid and weak base.
According to chemical analysis, at room temperature, the pH value of 1mol / L solution is strong acid in 1 ~ 4, weak acid in 4 ~ 6 and weak base in 7 ~ 9. Strong acid in 10 ~ 14. In the rubber joint manufacturing industry, through practice, we can draw the following conclusion: according to the unit calculation, sulfuric acid concentration less than 5 is weak acid, and more than 5 is strong acid.
Therefore, it is concluded that the liquid with 20 sulfuric acid concentration belongs to the strong acid range. Not suitable for EPDM joint or rubber Compensator However, in view of the high concentration of sulfuric acid in liquid medium pipeline, flexible compensation can be used to lining PTFE joint. PTFE lining is a special solution for strong acid-base substances. For the service life of strong sulfuric acid material pipeline is as long as 5 years, if the compensation capacity and external environment of the pipeline do not change greatly, the service life is even longer.