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Characteristics of hydraulic seal material

Release time:

2019-07-06 12:30

Source:

Characteristics of hydraulic seal material
 
Hydraulic sealsCommon sealing materials include metal sealing materials, polytetrafluoroethylene, synthetic, flexible graphite sealing materials, etc. Among them, synthetic sealing materials include styrene-butadiene material, neoprene material, silicon material, ethylene-propylene (EPM) material, fluorine (FPM) material, Ding Qing (NBR) sealing material (material), etc. Today, Xiao Bian wants to share what are the medium-resistant characteristics of common sealing materials for hydraulic seals?
 
Characteristics of "metal material" of 1. hydraulic seal material
Encyclopedia of metal sealing material knowledge: metal material (Metal Material; Ferrous metals, non-ferrous metals and special metals.) It refers to a metal element or a material mainly composed of a metal element and having metal characteristics. Including pure metals, alloys, metal material intermetallic compounds and special metal materials.
 
The medium and characteristics of the synthetic "silicon" of the material of the hydraulic seal:
 
The synthetic metal sealing material in the sealing material can rotate under high pressure, especially under high pressure or high temperature. Compared with the previous sealing materials, this is not suitable for other sealing materials. At this time, only metal materials can be used to make hydraulic auxiliary seals.
 
According to different working environment (occasion) conditions, there are different metal sealing material supply options, such as metal hollow O-seal sealing material, etc., in the end of the triangular wedge-shaped gasket, usually use chrome copper, such as 0Crl3. For flat pads, copper or aluminum pads are mostly used. Under the conditions of high-pressure and high-temperature working environment (occasions), the strength and elastic modulus of the above-mentioned sealing materials will be significantly reduced. At this time, heat-resistant alloys, such as high-nickel alloys, are used for application. Good strength, good abrasion resistance; nickel-molybdenum alloy, its corrosion resistance material is good, no heat treatment, high strength.
Hydraulic "fluorine" characteristics of the material of the auxiliary hydraulic seal of the 2. seal.
 
Characteristics of synthetic "fluorine" of hydraulic seal material: synthetic fluorine in seal material means that fluoroolefin copolymer is added to this type of seal during synthesis, and fluorine is a kind of sealing material with large output in the industry. The two common types of fluorine on the market are fluorine type 26 and main fluorine type 23.
 
Type 23 of seal is the product of a copolymer of vinylidene fluoride and chlorotrifluoroethylene. Equivalent to a class of foreign Kel-F fluorine, it has a very good resistance to strong acid, especially resistance to fuming nitric acid is very good, is this type of fluorine in the processing of great difficulty.
 
The fluorine 26 type of seal is the sealing material suitable for fluorine products. In order to adapt to various industries (uses), there are many kinds of fluorine in this type. Common materials are fluorine type 26 and fluorine type 246. Fluorine type 26 is more inclined to the product of vinyl fluoride and hexafluoropropylene, which is equivalent to the fluorine variety of foreign VITION. Its heat resistance and solvent resistance are estimated to be fluorine type 33. Except for this individual case, fluorine type 33 is basically replaced by fluorine type 23. The fluorine 246 type tends to be vinyl fluoride, hexafluoropropylene, tetrafluoroethylene terpolymer, its characteristics are heat resistance, solvent resistance performance is better than the fluorine 26 type. The fluorine used to seal the auxiliary seal is mainly the fluorine 26 type.
 
The fluorine of the seal has particularly good heat resistance, corrosion resistance, good resistance to superheated water, and good performance of superheated steam. It can be used stably for a long time at a temperature of 250 degrees Celsius, and is more widely used in occasions with corrosion resistance and high temperature resistance (working environment, medium resistance working conditions). The disadvantage of the sealed fluorine material is that it is not resistant to ammonia and strong Alkali, organic acid, concentrated acetic acid, acetone, ether, ethyl acetate, etc.

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