A PTFE O-ring is an endless round ring that has a circular cross section and is predominantly used as an axial static seal. By pressing the cross section during installation, the sealing effect comes into play. Since PTFE has a negligible elastic behavior, an expanding slot has been incorporated around the circumference. This side has to permanently face the pressure side.
PTFE O-rings are always used when the general elastomer O-ring cannot withstand the needed resistance for thermal or chemical applications. Due to good chemical resistance, physiological harmlessness and sterilizability, PTFE O-rings are widely used in the chemical industry, petrochemistry as well as in the medicine and food industry.
PTFE O-ring
Fields of application
static
dynamic
single acting
double acting
Linear
Rotating
oszilating
Main use
a simple sealant with an exellent thermal and chemical resistance
Materials
PTFE; PTFE with filling material
Advantages
- high chemical resistance
- Temperature resistance from -200°C up to +260°C
- good gliding properties
- physiological harmlessness, sterilisability
- for use in the food, chemical and petrochemical industries
- low coefficient of friction
Field of application
PTFE O-rings are used wherever the usual elastomer O-rings can no longer withstand the thermal and chemical requirements. PTFE can be used with almost all media. The only restrictions are with liquid alkali metals and some fluorine and halogen compounds. Due to their excellent chemical resistance, physiological harmlessness and sterilisability, they can be found in the petrochemical, food, chemical and pharmaceutical industries.
Main fields of application:
- static sealing – between flanges, housing parts and covers
Operating parameters:
To ensure a reliable sealing function, the operating parameters and their limit values must be checked as a whole
Technical values
Materials
PTFE, PTFE with filler materials
Pressure
up to 40 MPa
Temperature
-200°C / + 260°C (material dependent)
Speed
-
Maximum values temperature, speed and pressure are simultaneously not applicable! The values vary in dependence of material and media. For technical queries please contact our application consultants – we have the right solution for you.
Downloads
More O-rings
O-ring
Definition of O-ring dimensions and ordering sizes
• Inside diameter d1 from approx. 3 mm
• Cross section d2 from approx. 0,5 mm to 12 mm
Sealing effect
The sealing effect of the PTFE O-Ring results from the compression of its cross section during installation. To increase elasticity, the integrated expansion slot must always be located on the side of pressure.
Your contact person for
Technology - General sealing topics, special constructions
Ms. Karen Goller
Do you have any questions, ideas, or suggestions? We are more than happy to assist you with advice. In person, over the phone, or digitally
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