HBTS Hydraulic Cylinder PTFE 80 Shore Black Rubber O Rings

Product Specification

GSJ HBTS Hydraulic Cylinder PTFE 80 Shore Sealing O Rings
 
Custom Made Best Quality Mechanical Hydraulic Cylinder Internal Sealing O Rings Oil And High Temperature Resistance
 
The O-shaped rubber sealing ring is composed of a low-friction filled polytetrafluoroethylene (PTFE) ring and an O-shaped rubber sealing ring. The O-ring provides sufficient sealing pre-tightening force and compensates for the wear of the PTFE ring. The friction coefficient of PTFE is small, and the dynamic and static friction coefficients are similar.
Suitable for high and low speed reciprocating motion and high pressure system cylinder piston rod sealing. Two stepped ring seals are used to achieve zero leakage.
1. Features of O-type rubber sealing ring:
1. Convenient installation Since the structure of the O-shaped rubber sealing ring itself and the installation part are extremely simple and standardized, it is very easy to install and replace.
2. The structure is simple, the sealing performance is good, the cross-section structure of the O-type rubber sealing ring is extremely simple, and it has a self-sealing effect, and the sealing performance is reliable.
3. Wide range of application. Through the selection of appropriate rubber materials and appropriate formulation design, an effective sealing effect on oil, water, air, gas and various chemical media is achieved. The temperature range is wide (-60℃~+220℃), and the pressure can reach 1500Kg/cm2 in fixed use (used with the reinforcing ring).
4. Rich variety of materials suitable for various purposes, with standardized dimensions and grooves.
Application range of O-type rubber sealing ring:
O-type rubber seals are widely used in the sealing of diesel locomotives, automobiles, tractors, engineering machinery, machine tools and various hydraulic and pneumatic components. They can bear the sealing of fixed, reciprocating and rotating movements. In the sealing of mechanical products, O-type rubber seals Accounted for more than 50%.

 

Product specifications
There are several factors to consider when choosing the correct O-ring in a hydraulic system. The size of the O-ring is determined by the inner diameter, outer diameter and cross section. The inner diameter and outer diameter are the distance from the center of the O-ring to the inner and outer rings of the O-ring. O-rings have a wide range of inner and outer diameters, ranging from a few millimeters to one meter or more. When selecting the inner diameter of the O-ring, some space needs to be reserved to solve the thermal expansion problem.
The O-ring stretch rate should not exceed 5%, because excessive stretching will cause the cross-section of the O-ring to become flat. The O-ring cross section has a small range of variation, ranging from a few millimeters to tens of millimeters. When selecting O-rings for hydraulic applications, it is very important to understand the depth of the groove. Only when the cross-section of the O-ring is selected is correct, in order to avoid extrusion and tearing problems and ensure the sealing effect.
 
material
O-rings are available in a variety of materials, including nitrile rubber (NBR), ethylene propylene diene monomer (EPDM), fluorine rubber (FKM), silicone rubber (VMQ), etc.
Nitrile rubber (NBR) has excellent hydraulic oil resistance and can be used in a temperature range of -35°C to +120°C. It is a copolymer of butadiene and acrylonitrile. As the content of butadiene increases, it is more resistant to hydraulic oil, but its elasticity becomes worse. Although nitrile rubber is less resistant to ozone, ultraviolet light or weather, it has excellent compression set resistance, tear resistance and abrasion resistance. O-rings machined from nitrile rubber are usually the best choice for hydraulic applications.
O-rings processed by EPDM rubber have excellent heat resistance, water resistance, steam resistance, ozone resistance and UV resistance. It is very effective in sealing phosphate ester hydraulic oil and can replace nitrile rubber under certain application conditions.
Fluorine rubber (Viton®) O-rings have extremely high temperature resistance, grease resistance, fuel resistance, silicone oil resistance and resistance to many other media, making them very suitable for aviation applications. Increasing the fluorine content in FKM will increase the chemical resistance, but the low temperature resistance will decrease. Fluorine rubber can be used with non-flammable hydraulic fluids, and in some cases is a suitable choice for hydraulic applications.
Silicone rubber (VMQ) has good ozone and weather resistance, as well as good cold flexibility and high heat resistance, but it is easily affected by superheated steam. Silicone rubber O-rings have relatively low tensile and tear strength and are easy to wear. Although many properties are excellent, they are usually not used for processing into hydraulic O-rings.