[Chinese-English version] performance features of sealing materials main application place
2019-06-22

[Chinese-English version] performance features of sealing materials main application place


Characteristics



Temperature



Application



Nitrile -



Butadiene



Rubber



has good wear resistance, air permeability and oil resistance, and is suitable for hot water in mineral hydraulic oil, grease, silicone oil, flame retardant liquid and 80 ℃. It is not suitable for polar solvent and brake fluid. Ozone Resistance and weather resistance are general, but this will not affect the general seal because it is installed in the cylinder. Xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0



Good mechanical technological parameters,e.g. high abrasion resistance, low gas permeability and good resistance to mineral oil based lubricating oils and greases, hydraulic oils,highlynon-flammable hydraulic fluids HFA, HFB, HFC, silicone oils and greases, water up to approx. 80°C.NBR is generally not resistant to polar solvents, glycol-based brake fluids and highly non-flammable hydraulic fluids HFD. It has a low resistance to ozone, weathering and ageing. In most hydraulic applications this has no effect because the hydraulicseals are installed internally in the hydraulic components.



-30/+120℃



Because of its good comprehensive mechanical performance and good oil resistance, it is the most widely used



Hydraulic sealing materials for general use.



NBR is frequently used in the hydraulic field due to its good mechanical characteristics and resistance to mineral oil based lubricating oils and greases.



Fluoroel



astomer



High temperature resistance and medium resistance are good, and good resistance can still be maintained even at high temperature



Medium and compression-resistant deformation.



FKM is a fluorocarbon elastomer with high thermal and chemical



resistance.Its broad spectrum of resistance and relatively good



compression set, even at high temperatures.



-20/+200℃



Flame retardant, good air permeability. Applied to high temperature, ozone resistance and



Occasions with high Hou resistance requirements.



FKM is known especially for its non-



flammability, low gas permeability and excellent



resistance to ozone, weathering and aging.



Polyurethane



High mechanical strength, wear resistance, extrusion resistance, high pressure resistance, tear resistance, strong tear resistance



High degree. Good elasticity and ozone resistance



PU materials display higher mechanical strength,high abrasion, wear and extrusion resistance, high pressure load capacity,as well as a high tear and elongation at break resistance. Also have good flexibility xa0and very good ageing and ozone resistance.



-45+110℃



Widely used in mineral hydraulic oil, silicone oil, HFA/HFB type



Flame retardant solution, some grades are suitable for hot water up to 50 °c.



PU materials are suitable for application in



mineral oils and greases,hydraulic oils, silicone



oils and greases, highly non-flammable hydraulic fluids HFA and HFB and water up



to 50°.



Fabric



Reinforcement



Rubber



Wear resistance, extrusion resistance and low temperature resistance are good, and the product has good dimensional stability and moisture absorption resistance.



Have high wear resistance, good low temperature resistance and high pressure load and extrusion resistance. In addition rubber fabric hydraulic seals are inherently very dimensionally stable and have a low moisture expansion tendency in hydraulic media.



-30/+100℃



Especially suitable for heavy duty environment.



Particularly well suited for rough application



conditions, such as in mobile hydraulics or other



heavy duty applications.



Silicone



Rubber



Or (Or)



Good heat resistance, good dielectric properties, good low temperature elasticity, Hou resistance, ozone resistance and UV resistance



Okay. Generally not suitable for mineral oil. Xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0xa0



VMQshows excellent heat resistance, cold flexibility,dielectric properties and especially good resistance to weather, ozone and UV rays.Not suitable for oil based fluid.



-60/+230℃



It is widely used in food and low temperature environment.



xa0Foodstuff and cryogenic engineering.



Polypropylene rubber



Polyacrylate



Rubber



Excellent resistance to ozone, weather and heat-resistant air, general mechanical strength, elasticity and resistance



Low temperature is not good.



ACM shows excellent resistance to ozone, weathering and hot air, although it shows only a medium physical strength,low elasticity and a relatively limited low temperature capability.



-20/+150℃



Mainly suitable for cars with extreme pressure additives in high temperature environment



Use grease.



ACM materials are mainly used in automotive applications which



require special resistance to lubricants containing many additives



(incl. sulfur) at high temperatures.



EPDM rubber



Ethylene



Propylene



Diene Rubber



Or (Or)



Good heat resistance, ozone resistance and weather resistance, good elasticity, low temperature performance and insulation performance.



EPDM shows good heat, ozone and aging resistance. In addition they also exhibit high levels of elasticity, good low temperature behavior as well as good insulating properties



-50/+150℃



Commonly used in brake fluid and hot water environment.



EPDM can often be found in applications with



brake fluids (based on glycol) and hot water.



Hydrogen-coated rubber



Hydrogenated



Nitrile



Butadiene



Rubber



Good comprehensive mechanical performance. The temperature used in mineral oil is-30-1 40 ℃, which can be used in a short time.



Up to 160 °c.Some grades can reach low temperature resistance-40 °c.



HNBR shows good mechanical properties.The operating temperature of HNBR ranges between -30°C and +140°C(for a short period of time up to +160°C) in contact with mineral oils.Special types can be used down to -40°C.



-30/+140℃



Mineral oil suitable for high temperature environment.



Mainly use in mineral oil at high temperature.



Chloroprene



Rubber



Xa0xa0xa0xa0xa0xa0 is ozone-resistant, Hou-resistant, chemical-resistant, and has good flame resistance, low temperature performance and mechanical strength.



In general the CR materials show relatively good resistances to ozone, weathering, chemicals and aging.Also they show good nonflammability, good mechanical properties and cold flexibility.



-30~+100℃



Used in the refrigeration industry and outdoors.



CR materials are found in sealing applications such as refrigerants, for outdoor applications.



PTFE



Polytetrafluor



oethylene



Pure PTFE can withstand almost all hydraulic Media, solvents and various chemical media, with extremely low friction coefficient and no crawling phenomenon.Ozone Resistance, excellent weather resistance and flame resistance.In order to improve its cold resistance, filling materials are usually added when the seal is manufactured.



PTFE display almost universal chemical resistance,an extremely low friction value which results in very good sliding characteristics, no stick-slip effect,particular rigidity and almost unlimited ozone, weathering and ageing resistance. PTFE is impervious to almost all known hydraulic media, lubricants,chemicals and solvents.PTFE is non-flammable and so does not constitute an additional hazard in case of fire.Pure PTFE is not totally without disadvantages as it has a tendency to cold flow or crawl under pressure load.These weaknesses are counteracted by the use of seal compounds mixed with fillers.



-55~+260℃



Pure PTFE is especially suitable for the food, beverage and pharmaceutical industries.



Filled PTFE is suitable for almost all working conditions.



The elastic body or spring is used in conjunction with it, and it is widely used.



Used in hydraulic, compressor, chemical and other industries.



Pure PTFE is particularly suitable for food and



beverage applications, pharmaceuticals and



medical application areas. PTFE is not or only



slightly elastic. For this reason, PTFE seal



elements are activated by elastic energising



elements in the form of o-rings or stainless steel springs. xa0Compounds filled with bronze for example, give PTFE the ability to adapt to most application conditions.



Nylon



Good anti-wear performance.It has the characteristic of volumetric expansion after moisture absorption.



PA has a good wear resistance.Water absorption and resulting change



in volume can be catered for by increasing housing tolerances.



-40~+120℃



It is commonly used in making wear rings and retaining rings of large specifications.



PA is a high-molecular polyamide from which



even large elements can be produced



economically,is used for large bearings and



support rings.



Polyoxymethyl



Good sliding performance, good dimensional stability, resistance and water absorption.



Excellent sliding characteristics, particularly in the dry-running range



of the bearing element.The material is tough and maintains good



stability of shape at different temperatures. Its chemical structure also



gives it high resistance to various fluids with low water absorbtion.



-40~+140℃



It is especially suitable for making guiding elements and retaining rings.



Particularly suitable for the functions which



guide rings and back-up rings are required to



fulfil.



Ultra high molecular weight polyethylene



Utra High Molecular



Weight Polyethylene



Excellent wear resistance.



Excellent wear and abrasion resistance.



-160~ +100℃



Commonly used in water and low temperature conditions.



Best in aqueous solutions and cryogenic



temperatures.



Phenolic Resin



Fabric



Reinforcement



C380 or



Composed of fiber and resin, the product has a long life, small friction resistance, elasticity and resistance



Good water absorption resistance.



With the selection of the optimal material combinations (fabric/resin), a



long product life, high restoring force, low friction and very high



contact pressure (load capacity) can be achieved. No moisture



expansion in water; or measurable absorption of water.



-60…+120℃



For occasions with high load and shear force, such as heavy load wear resistance



Selected for application areas in hydraulics with



high loads and shear forces,heavry duty wear



ring for example.

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