Perfluoroether rubber can resist more than 1600 kinds of chemicals such as strong acid, strong alkali, organic solvent, corrosive gas, high temperature superheated water-steam, ethers, ketones, esters, alcohols, aldehydes, amines, strong oxidants, etc. Medium corrosion, temperature resistance up to 320°C. The materials that our company can make include various rubber materials (NBR, FKM, FFKM, SIL, EPDM, HNBR, CI, etc.), various polyurethane materials (oil resistance, hydrolysis resistance, high temperature resistance, food grade, ultra-wear resistance, etc.), various engineering plastics (PTFE, PTFE composite, ultra-high molecular polyethylene, PA, POM, phenolic resin, etc.) and metal materials.

keyword：Tetrafluoro series Engineering plastics series Rubber series Metal series

Products Detail

Parameters

The internal open type is suitable for internal positive pressure conditions. The C-ring is a typical self-sealing structure. When the medium pressure enters the C-ring in the working state, the pressure self-tightening effect is generated on the C-ring from the inside to the outside, that is, the greater the system pressure, the better the sealing effect. Due to the principle of opening and self-sealing, it is only necessary to overcome the elasticity of the sealing ring itself during installation, so a very ideal sealing effect can be obtained without using a large pre-tightening force. Our company adopts INCONEL 718 alloy to manufacture.

Construction of perfluoroether FFKM

● The structure of perfluoroether FFKM is composed of main chain part: TFE (tetrafluoroethylene), branch part: PMVE (perfluoromethyl vinyl ether) and bridging part.

● Both TFE and PMVE copolymers with a molar ratio of 25%~40% are elastomers, because they do not contain common hydrogen and other elements except C, F and 0 elements, and PMVE provides trifluoromethoxy linked to the main chain The base side chain is called perfluoroether rubber.

● The vulcanized rubber of perfluoroether rubber vulcanized by an appropriate vulcanization system has the same strong oxidant resistance, high temperature resistance and chemical resistance as Teflon plastic, and also has the elasticity of rubber.

Molecular composition of perfluoroether FFKM Schematic diagram of molecular structure

Characteristics of perfluoroethers

● It has elasticity and thermal stability and chemical stability of PTFE.
● The long-term working temperature is -39~288 degrees Celsius, and the short-term can reach 315 degrees Celsius. It still has a certain degree of plasticity below the embrittlement temperature, hard but not brittle, and can be bent.
● Stable to all chemicals except swelling in fluorinated solvents.

Since perfluoroether FFKM does not contain hydrogen, the carbon-fluorine bond in it is the strongest single bond in organic chemistry (C-F bond energy is as high as 544kJ/mol), which makes perfluoroether rubber have excellent chemical resistance and resistance to strong oxidants performance and high temperature resistance.

Because ordinary fluororubber still has carbon-hydrogen bonds on its carbon chain (C-H bond energy 414kJ/mol), its binding force is worse than that of carbon-fluorine bonds, so the heat resistance and chemical resistance of ordinary fluororubber are worse than perfluoroether rubber.

Binary fluororubber Ternary fluorine rubber Teflon (no elasticity)

● Color types: black, white
● Hardness range: 65~90 Shore A
● Processing technology: compression molding
● National standard GB/T3452.1-2005
● American Standard AS-568
● German standard DIN 3771
● Japanese standard JIS B2401
● International standard ISO 3601
● Non-standard specifications (non-standard size O-rings can be customized according to customer requirements)

Youjia's perfluoroether rubber O-rings can completely replace KALREZ and imported perfluoroether.

Advantages of perfluoroether sealing products

In addition to excellent chemical resistance and heat resistance, perfluoroether sealing products are homogeneous, and the surface is free from problems such as penetration, cracking and pinholes. These features can improve sealing performance, extend the operating cycle, and effectively reduce maintenance costs. The long-term efficacy of perfluoroether sealing components can improve production efficiency and reduce maintenance costs. These total costs are much higher than the initial purchase price of the seal. Perfluoroether sealing products can prolong the average maintenance time and reduce unscheduled production shutdown and maintenance costs. For some special industries, the loss caused by abnormal downtime is far greater than the maintenance parts and labor costs. Perfluoroether sealing products can effectively help users improve process stability, prolong the working time of equipment, and obtain maximum benefits for customers.