[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.