Fluororubber and nitrile butadiene rubber are two commonly used special rubber materials, which have their own unique properties and uses. In some cases, we may need to distinguish between the two materials in order to better select the one that suits our specific needs. Here are some ways to distinguish fluororubbers from nitrile butadiene rubber:
First. Chemical composition and structure
1. Fluorinated Rubber: Fluorinated rubber is mainly composed of fluoroalkyl groups (such as CF3CF2) and usually contains double bonds and unsaturated C-F bonds. This chemical structure makes fluorine rubber has excellent chemical corrosion resistance, oil resistance and high temperature resistance.
2. Nitrile Rubber: Nitrile rubber is mainly composed of butadiene and acrylonitrile (AN) copolymerization. Due to the nitrile group, nitrile rubber has good resistance to oil and aliphatic solvents, and also has some chemical resistance.
Second. Physical properties
1. Color and appearance: Fluorine rubber usually presents a deeper, more vivid color, while nitrile rubber presents a light yellow or light brown.
2. Density: The density of fluorine rubber is usually higher than that of nitrile rubber because of the greater mass of fluorine elements in its molecular structure.
3. Hardness: The hardness of nitrile rubber is usually higher than that of fluorine rubber, and the feel is relatively soft.
4. High temperature resistance: Due to the high C-F bond energy of fluorine rubber, its high temperature resistance is significantly better than nitrile rubber. At high temperatures, NBR is prone to oxidation and thermal degradation.
5. Chemical resistance: Although nitrile rubber has good resistance to oil and aliphatic solvents, its performance will be affected under the action of strong acids, alkalis or oxidants. In contrast, fluororubbers have stronger chemical resistance.
6. Elasticity and compression permanent deformation: nitrile rubber has good elasticity and low compression permanent deformation rate, while fluorine rubber has relatively poor performance in this respect.
Third, use and applicable environment
1. Nitrile rubber: mainly used in the manufacture of oil and chemical corrosion resistant seals and pipe fittings. Applicable to petroleum, chemical, automotive and other fields.
2 Fluorine rubber: due to its excellent high temperature resistance and chemical corrosion resistance, fluorine rubber is widely used in aerospace, petrochemical, automotive manufacturing and other high temperature and harsh environment sealing and bonding.
Fourth. Summary
Fluororubbers and nitrile butadiene rubber are distinguished mainly based on their chemical composition, physical properties and applications. By carefully comparing these properties, we can accurately distinguish between these two specialty rubber materials, allowing us to make an informed decision when choosing the right material.
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