Conveying materials that contain oil, fat, and grease can have a very detrimental effect on the performance and life expectancy of a conveyor belt because it penetrates into the rubber causing it to swell and distort, resulting in serious running problems. In order to achieve the absolute minimum of swelling and distortion caused by oil, even on the most demanding of applications, we apply stringent American ASTM’D’ standard test methods.
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Oil resistance can be divided into two sources – mineral oil and vegetable and animal oils. Despite the different characteristics, most manufacturers produce only one oil-resistant rubber cover quality compound whereas we have developed two compounds to provide the best possible protection against those differing needs.
Although oil resistant belts usually have a lower resistance to cold, Fenner Dunlop oil resistant belts are designed to operate in cold temperatures as well.
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The oil resistance conveyor belt refers to the ability of rubber vulcanizes to resist oil turbidity. When the surface of the rubber conveyor belt is in contact with various oils(Including oils, greases, vegetable & animal fats) within a certain temperature range for a long time, the oil may penetrate into the rubber, causing volume increase and swelling. At the same time, the oil medium may react from the soluble compounding agents (mainly low molecular weight plasticizers) in the conveyor belt, resulting in a reduction in volume (shrinkage). The two are a dynamic balancing process. Usually, the degree of swelling or shrinking increases with the contact time between the surface of the rubber conveyor belt and the oil, until the volume change reaches equilibrium. The higher the temperature, the shorter the time required to reach volume equilibrium. In addition, some additives in oil products may chemically react with rubber molecules, causing cross-linking or degradation of rubber.
NBR is a commonly used oil-resistant rubber, and its oil resistance increases with the increase of acrylonitrile content. NBR with high acrylonitrile content has better resistance to mineral oil, but its heat resistance is limited. When the oil temperature exceeds 150 ° C, HNBR, FPM, FVMQ or ACM should be used.
Description Rubber material Permissible temp.°C Application area OR NBR -20 ~ 80 – Oil and fat resistant for products containingSUNGDA’s oil-resistant conveyor belts are designed to resist the penetration and destructive effects of vegetable oils, fats and mineral oils. Unlike our competitors, our engineers have also developed covers for different purposes, such as oil& flame-resistant, oil&heat-resistant, etc., covering most oils or oil-containing products and complex transportation environments, and its economy far exceeds that of competitors.