Based on the integral ratio of aluminoxane and Me3Al to toluene in this sample, the amount of soluble aluminoxane decreased by about 20% over 140 days due to gelation. Interestingly, methane formation was not detectable over this period in this (sealed) sample suggesting that gelation occurs without chemical change at room temperature. Indeed, since the gel can be redissolved in a donor solvent, initial gelation must be a process involving non-covalent interactions which makes sense given the sheet structure for an isolated component of MAO. On the other hand, it seems plausible that physical gelation maybe complicated by chemical cross-linking in samples where water is not completely excluded; for example, if exposed to the atmosphere in a glovebox with ppm background levels of water for long periods of time.