Seeking advice on material selection and manufacturer recommendations for mechanical seals

You might find good answers in the relevant production departments of your company. It’s also a good idea to get in touch directly with larger sealing manufacturers in China, as suggested by the person above

That makes sense; such issues can be asked directly to the manufacturer

A regular mechanical seal won’t work; a special material is needed, such as an O-ring made of Kalrez

Imported brands include Borgman, CRANE, and FLOWSERVE. However, imported services are generally of poor quality. The lead time for spare parts is long.

You can go ask Dan Dong and Klan. What we use is either PTFE or fluororubber coated with PTFE. The effect is pretty good. Specifically, you can have the manufacturing factory conduct an analysis based on your operational conditions.

The media are propylene and formaldehyde, and the damaged components are mainly machine seals and O-rings. Organic substances are miscible with each other, which can cause components made of non-metallic or organic materials such as O-rings to swell or even get damaged. Therefore, special attention should be paid to the selection of materials for these components. Since the main material used for machine seals is not known, it is impossible to determine the primary cause of corrosion; only swelling due to organic substances can be confirmed. It is recommended to contact well-known domestic and international manufacturers of mechanical seals to obtain their technical support; resolving this issue should not be difficult, as we also have transfer pumps for media such as propylene and vinyl chloride monomer, and no leakage problems with the mechanical seals have occurred there. Recommendations: foreign companies such as Borgman and John Crane, as well as domestic enterprises like Huaxin in Chengdu, Sichuan, and Tianjin Fuyong Sealing Devices ； Actually, for this issue, it is recommended to contact domestic companies.

You can contact the manufacturer directly; they will give you the best answer.

Brother has found the answer for you! ! ! Ethylene Propylene Diene Monomer (EPDM) – EPDM. The Chinese name for EPDM is “Ethylene Propylene Diene Monomer”. Introduction to EPDM: EPDM is a terpolymer of ethylene, propylene, and a non-conjugated diene. Its commercial production began in 1963. The global consumption volume each year is 800,000 tons. The most prominent feature of EPDM is its excellent resistance to oxidation, ozone, and corrosion. Since EPDM belongs to the polyolefin family, it possesses excellent vulcanization properties. Of all rubbers, EPDM has the lowest specific gravity. It can absorb large amounts of filler and oil with little effect on its properties. Therefore, rubber compounds with low production costs can be manufactured. 　　Molecular Structure and Properties EPDM is a terpolymer of ethylene, propylene, and a non-conjugated diene. Dienes have a special structure, allowing only one of their double bonds to participate in copolymerization, with the unsaturated double bond serving primarily as a cross-linking site. The other unsaturated group will not become part of the polymer’s main chain; it will only serve as a side chain. The main polymer chains of EPDM are completely saturated. This property enables EPDM to resist heat, light, oxygen, and especially ozone. EPDM is essentially non-polar, resistant to polar solutions and chemicals, has a low water absorption rate, and exhibits excellent insulating properties. 　　During the production of EPDM, its properties can be adjusted by changing the amounts of the three monomers, the ethylene-to-propylene ratio, the molecular weight and its distribution, as well as the vulcanization method. 　　Selection of the third monomer for EPDM Monomers of the diene type are obtained through the copolymerization of ethylene and propylene, thereby introducing unsaturation into the polymer to enable vulcanization. The selection of the third monomer must meet the following requirements: at most two bonds – one that can be polymerized and one that can be vulcanized; the reaction should be similar to that of two basic monomers; random polymerization of the key bonds results in a uniform distribution; sufficient volatility to facilitate removal from the polymer; an appropriate vulcanization rate for the final polymer. The type and amount of dienes affect the properties of the polymer. In the production of EPDM, ENB and DCPD are primarily used. 　　The most widely used type in EPDM is ENB, which cures much faster than DCPD products. Under the same polymerization conditions, the nature of the third monomer influences long-chain branching in the following order of increasing effect: EPM

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