How to classify oily rubber seal materials? Rubber seal materials classified by oil resistance can be divided into polar rubber and non-polar rubber materials. the following Dongsheng seals tell you which sealing rubber materials are oil resistance properties, what materials are not oil resistant!
I. rubber seals are classified according to Oil resistance (polar rubber): CR, NBR, HNBR, CSM, FKM, ACM, AEM, FMVQ, CO, PUR.
Two, don't oil resistance rubber classification (non-polarity rubber): nr ir br sbr iir epr epdm.
III. analyze the materials and features of rubber seals resistant to various oils:
1. oil resistance to combustion: FKM fluorine rubber seal and FMVQ fluorine silicone rubber seal have poor oil resistance to fuel oil, the oil resistance of the NBR Ding Qing rubber seal material increases with the increase of propylene Qing content, and the oil resistance of chlorol rubber is better than that of Ding Qing rubber.
2. mixed fuel resistance: FMVQ fluorine silicone rubber and FKM fluorine rubber seals have good resistance to mixed fuel oil, followed by poor mixed fuel resistance of acrylic rubber, the mixed fuel resistance of the NBR rubber seal material increases with the increase of propylene content; the fluorine rubber with high fluorine content is better for the mixed fuel.
85/15 average dissolution of rubber gasoline/methanol (54 degrees)/85/15 average dissolution of gasoline/ethanol (54 degrees )/
3. mineral oil resistance: NBR Ding Qing rubber is a commonly used mineral oil resistant rubber seal material. the mineral oil resistance of Ding Qing rubber increases with the increase of propylene Qing content, but the heat resistance of Ding Qing rubber with high propylene Qing content is limited. When the oil temperature reaches 150 degrees, hydroding fine rubber, fluorine rubber FKM, fluorine silicone rubber FMVQ and acrylic rubber should be used. When the oil temperature reaches 150 degrees, FKM of fluorine rubber and FMVQ of fluorine silicone rubber have good effect. However, the cost is high. in order to reduce the cost, it can be incorporated into the fluorine rubber FKM into the acrylic rubber below 50, and the performance of the cured rubber can be reduced by no more than 20.
4. acid-resistant oxidation fuel: for acid oxidation fuel, hydrogen peroxide in acid oxidation fuel can deteriorate the performance of sulfide rubber, so Ding Qing rubber commonly used in fuel system, chlorol rubber is difficult to meet the requirements of long-term use. Only fluorine-containing elastomer such as fluorine rubber FKM, fluorine silicone rubber FMVQ, phosphorus fluoride clear and hydrogen Ding clear rubber have better performance. Ordinary Ding Qing rubber compound cannot work for a long time in 125 degree acidic gasoline. Only the low sulfur-giving body with cadmium oxide and the Ding Qing rubber with white carbon black as the main raw material can better resist acidic gasoline and increase the content of propylene Qing, which can reduce the sex of acidic gasoline.
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