O-ring - NBR

SVKS Seal, with over 10 years experience, is one of the leading standard heat resistant rubber o ring with material nitrile viton silicon manufacturers and suppliers in China. And we also offer the customized service catering to your special requirement. Please be free to buy the rubber products...
Product description

O-ring - NBR


NBR (Nitrile rubber) is the general term for acryl-nitrile butadiene polymer.


O-rings are the most common sealing element, and because they are cheap and simple, the area for application of O-rings is very wide in hydraulic and pneumatic systems. 


Where working conditions and equipment are suitable, they can be used both in static and dynamic applications, but they are not recommended for rotary movements.


Because they take up less space and provide two-sided sealing compared with other sealing elements, O-rings make designing easier. 


Obtaining good results from O-ring applications depends on suitable measurements, choosing correct materials, and suitable surface quality on metal parts.

PROFILE


PRODUCT ADVANTAGES

• Can be used both for hydraulic and pneumatic systems

• Can be used both for static and low-pressure dynamic applications

• Both for rod and piston applications

• Wide compound range

• A wide range of dimensions

• Easy installation and removal

• Economical sealing solutions

APPLICATION

Used in almost every industry but especially in non-moving machinery and in static sealing applications as a flange or cover seals.

Good chemical resistance to mineral oils and greases and hydraulic oils. Not suitable for outdoor use because of poor resistance to ozone and UV rays.   


INSTALLATION

O-rings are fitted into the groove by hand. It is very important that the assembly tools must be of a soft material and have no sharp edges. Before installation, all individual parts of the seal must be oiled with system oil.

Tolerances: DIN 3771 / ISO 3601


SPECIAL APPROVALS – FOOD-GRADE-QUALITY

We also stock specially approved materials for the food industry; EU 1935/2004, EU2023/2006; KTW, FDA, NSF, WRC, EN 681, ACS, DVGW, UL etc.


NOTES

For special applications that require high temperatures, O-rings can be produced in FKM material. Can be used up to 400 bar with a backup ring.


Typical Test

Results

Hardness Change, points +/- 10 -3

Tensile Strength Change, % -25 max. -13

Ultimate Elongation Change, % -25 max. -22

Volume Change, % -5 to +10 +3

FLUID RESISTANCE – ASTM Fuel B – EF21, ASTM D 471 (70 hrs.  23oC) ASTM D2000

Requirements

Typical Test

Results

Hardness Change, points -30 to 0 -14

Tensile Strength Change, % -60 max. -36

Ultimate Elongation Change, % -60 max -32

Volume Change, % 0 to +40 +22

FLUID RESISTANCE –ASTM #1 Oil – EO14, ASTM D 471 (70 hrs.  100oC) ASTM D2000

Requirements

Typical Test

Results

Hardness Change, points -5 to +10 +6

Tensile Strength Change, % -25 max. +6

Ultimate Elongation Change, % -45 max. -20

Volume Change, % -10 to +5 -9

FLUID RESISTANCE – IRM 903 Oil, -EO34, ASTM D 471 (70 hrs.  100oC) ASTM D2000

Requirements

Typical Test

Results

Hardness Change, points -10 to +5 -6

Tensile Strength Change, % -45 max. -14

Ultimate Elongation Change, % -45 max. -25

Volume Change, % -10 to +25 +5

LOW TEMPERATURE RESISTANCE – F17, ASTM D 2137 Method A, 9.3.2 ASTM D2000

Requirements

Typical Test

Results

(Non-brittle after 3 min.  -40oC) Pass 

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