Viton FKM Rubber Sheet 1

by Dongrubber on July 17, 2006 · 0 comments

1. Brief Introduction of Viton FKM Rubber Sheet

Fluorine rubber is refers to the main chain or side chain carbon atoms containing fluorine atoms one synthetic polymer elastomer. This kind of rubber has high temperature resistant, oil resistant, and the characteristics of resistance to a variety of chemical etching. This makes it become the indispensable materials for modern aircraft, missile, rocket and space travel and other cutting-edge science and technology and other industry.

Since 1940s the fluororubber appeared, due to its excellent features and practicability that has received the extensive attention of all countries, thus it develops very fast, with a wide variety. Its classification method also is not the same, according to their chemical composition the FKM rubber sheet can be divided into fluoride diene rubber, fluorinated polyacrylate rubber fluoride, fluoride, containing fluorine olefin copolymer polyester rubber, fluorinated silicone rubber, nitroso fluorine rubber and other fluorine rubber.

Although Viton Rubber has big output and use, the present production types are only 26 type and 23 type Viton FKM rubber.

(1) 26 type fluorine rubber. 26 type fluorine rubber is by far the most common type of fluorine rubber varieties, and its consumption accounted for about 90% of the total consumption of fluorine rubber. In order to adapt to a variety of purposes, they have production of various grades, but in terms of its basic varieties, FKM rubber mainly has the following two kinds.

1. Viton Rubber – 26. FKM Viton Rubber – 26 is the partial fluorine ethylene and hexafluoropropylene emulsion copolymer. During copolymerization, vinylidene fluoride and hexafluoropropylene amount of substance ratio is 4:1 or 7:3 or 3:1.

2. Viton Rubber – 246. Fluorine rubber – 246 is partial fluorine ethylene tetrafluoroethylene and hexafluoropropylene, terpolymer. Three kinds of monomers proportion is 65 ~ 70, vinylidene fluoride tetrafluoroethylene 14 ~ 20, hexafluoropropylene 15 ~ 16. Commodity brand mainly has VitonB (USA), Diael (Japan), etc.

Other varieties were evolved from the above two, some of which have improved the process performance, some improved thermal performance, reduces the compression deformation, etc.

(2) 23 type fluorine rubber. 23 type fluorine rubber is from vinylidene fluoride and fluoride vinyl chloride at room temperature and under the pressure of 3.3 MPa, produced a kind of copolymer with rubber suspension method. It is the earliest industrial scale production of fluorine rubber varieties, but due to the processing difficulties, its development is limited. Currently, 23 type Viton fluorine rubber except strong acid resistance (especially the fuming nitric acid) has been employed, 26 type fluorine rubber sheeting has been replaced many other occasions.

In Type 23 FKM fluorine rubber, the fluorine content of vinyl chloride had a great influence on its performance. Test proved that when three fluorine in copolymer of vinyl chloride content less than 20% (mole fraction), the resistance on the oils, fuels and chemicals are bad; Whenthe content is more than 69% (mole fraction), the co-polymer becomes harden, flexible performance and flexibility are poor. For this purpose, we need to strictly control the ratio of monomer during copolymerization. At present, it often uses the ratio of monomers polyvinylidene fluoride, three fluorine ethylene oxide is 1:1 and 2: l (or 7:3) two kinds. Using a ratio of previous production brands have fluorine rubber 23-11, Kel F –5500 (USA), Voltalef5500 (France), CK-32-11, etc; Taking the latter ratio production have brands FKM fluorine rubber – 23-21, Kel F – 3700 (USA), etc.

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