Product Description

Polytetrafluoroethylene (PTFE) O-rings have the same shape as general synthetic rubber O-rings. Our company specializes in the production of turned PTFE O-rings, without molds CNC turning process, size specifications flexible to meet the various needs of customers. This kind of O-ring is suitable for strong acid, strong alkali, strong corrosion, high temperature or low temperature medium sealing, instead of fluorine rubber ring and other rubber ring is not resistant to high pressure, corrosion and high temperature medium sealing, widely used in aerospace, food, chemical and medical machinery field.

Product features

High-temperature resistance - the use of working temperature up to 250 ℃.

Low temperature resistance - good mechanical toughness; even if the temperature drops to -196 ℃, can maintain 5% elongation.

Corrosion resistance - to most chemicals and solvents, showing inertia, strong acids and alkalis, water and a variety of organic solvents.

Weather resistant - has the best aging life of any plastic.

High lubricity - has the lowest coefficient of friction of any solid material.

Non-adhesion - has the lowest surface tension of any solid material and does not adhere to any substance.

Non-toxic - physiologically inert, no adverse reaction to long-term implantation as artificial blood vessels and organs.

Use working conditions

Working pressure: ≤40MPa;

Temperature: -180~+260°C

Medium: practically applicable to all liquids, gases and chemical substances.

Applicable environment: chemical industry, petrochemical, oil refining, chlor-alkali, acid production, phosphorus fertilizer, pharmaceutical, pesticide, chemical fiber, dyeing, coking, gas, organic synthesis, non-ferrous smelting, iron and steel, atomic energy and the production of high-purity products (such as ionic membrane electrolysis), viscous material transport and operation, highly stringent health requirements of food, beverage and other processing and production sectors.

Installation of PTFE O-Ring

Since the surface of PTFE O-ring is easier to scratch than that of rubber, special tools (the same as rubber O-ring installation tools) should be used for installation. Before installation, the O-ring should be soaked in boiling water at about 100℃ for a few minutes, to be softened and quickly stretched and loaded into the groove, at this time the diameter of the elongation rate should be 8% to 10%, the maximum shall not exceed 20%. When the need to cross the maximum diameter of the shaft so that the stretch rate exceeds this value, the O-ring should be heated to 316 ℃, and then quickly stretch over the maximum diameter of the shaft mounted in the groove, and then cooled. And then the O-ring fitted with the whole part or equipment heating to do a "heat treatment", O-ring will not occur larger plastic deformation, and can ensure that the required amount of compression deformation. Of course, the best way is to use a combination of mounting grooves. At this time, the sealing ring only needs a small amount of tension can be smoothly installed into the groove, disassembly is also very convenient.

Order specification

O-ring can be customized non-standard specifications, part of the specifications can be referred to: O-ring American AS 568 standard, O-ring British BS 1806 standard, O-ring international ISO 3601 standard, O-ring British BS 4518 standard, O-ring Swedish SMS1586 standard, O-ring German DIN 3771 standard, O-ring French NFT 47-501 standard, O-ring Japanese JIS B 2401 standard, O-ring Japanese JIS B 2401 standard, O-ring, O-ring, O-ring, O-ring, O-ring, O-ring, O-ring, O-ring, O-ring, O-ring, O-ring. JIS B 2401 standard, O-ring metric system IS0 6149 standard.