Large Diameter O Ring NBR Rubber Sealing Molding Part

Large diameter fluorine rubber nitrile rubber ring, glue cold bonding or hot vulcanization bonding

Description:

Because fluorine rubber and nitrile rubber are the most commonly used sealing materials.

Nitrile rubber has good oil resistance and is a very cost-effective rubber.

Fluorine rubber is often used in high temperature environments.

Sealing strips are often used for mechanical seals.

It is difficult to process large mechanical equipment through molding and extrusion methods,

which makes the cost very high. Therefore, for large sealing rings,

we usually use extrusion processing to make rubber strips, and then paste both ends into a ring.

NBR is the most commonly used elastomer for o ring and other sealing devices.

Nitrile material outperform most other elastomers due to high tensile strength,

as well as excellent abrasion, tear and compression set resistance.

Nitriles also have very goos aging properties under severe conditions.

Because of the double bonds present in the polybutadiene parts of the chemical backbone,

nitrile material have poor resistance to ozone, sunlight, and weathering.

They should not be stored near ozone-generating electric motors or equipment.

General temperature range:-40 to +225℉

NBR performs well in :

• Petroleum oil & fuels
• Silicone oils & greases
• Ethylene glycol
• Water ( below 212 ℉)

NBR does not perform well in:

• Aromatic hydrocarbons ( benzene, toluene, xylene)
• Automotive brake fluid
• Halogen derivatices ( carbon tetrachloride, trichloroethylene)
• Ketones ( MEK, acetone )
• Phosphate ester hydraulic fluids
• Strong acids

Fluorocarbons make exellent general purpose O ring due to their exceptional resistance to chemical,

oil, and temperature extremes (-15to 400℉).

Specialty compounds can further extend the low temperature limit down to about -22 ℉

fordynamic seals and about -40℉ in static applications.

Fluorocarbons usually have good compression set resistance,

low gas permeability, and resistance to ozone and sunlight.

Over the last five decades, this remarkable combinnation of properties has formulated for use in aerospace applications.

FKM compounds are now widely used in automotive, appliance, fuid power, and chemical processing industries.

Depending on the specific needs of your application,

there are number of different fluorocabon formulations available for use.

Though they may share some common characteristics,

these different types are distinguished bu their processing and end-use properties.

General Temperature range: -15 to 400 ℉

FKM performs well in :

• Acid
• Aircraft engine application
• Gasoline ( & alcohol blends)
• Hard vacuum applications
• Petroleum productions
• Silicone fluids & greases
• Solvents

FKM does not perform well in:

• Amines
• Hot Chlorosulfonic acid
• Hot hydrofluoric acid
• Hydrocarbons (nitro)
• Ketones
• Low molecular weight esters & ethers
• Fireprrof hydraulic fluids ( e.g Skydrol)

Cold bonding: The two ends of the extruded rubber strip are bonded together with

rubber special glue and then cooled.

Thermal bonding: Compared with cold bonding,

thermal bonding is more stable and has a longer service life under pressure.

Commonly used bonding methods are: cold bonding and hot bonding.

NBR rubber operating temperature: -15 degrees Celsius -120 degrees Celsius

Fluorine rubber operating temperature: -20 degrees Celsius -250 degrees Celsius

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