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Question: I would like to know what is the maximum weight increase (swelling) of the polyurea after a month of immersion should be in the lining of a tank? For example, if my polyurea has a 4 percent weight increase after one month of immersion in gasoline, will this polyurea resist for 5 or 10 years?
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Answer:It is not a good idea to utilize a polyurea system in constant exposure to gasoline. The solvent level in gasoline will cause the polyurea to soften and swell as you have indicated. The softening could very well progress to the point of failure and certainly the systems other physical properties would be significantly compromised. There may be some systems available that can tolerate constant gasoline exposure. You should call a few of the PDA member manufacturers to get some references.
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