Michael, Hi! As one who fishes, i can vouch for the fact that monofilament has a finite life. I'm sure the companies who manu./sell it have info but you also might talk to the fly fishing line companies. These folks are constantly testing, evaluating and strengthening their product. They have some with braided and reinforced cores that might be applicable to your use. Who knows, they might even donate? Linn Michael Smith wrote: > At the National Model Aviation Museum we have a lot of model aircraft > suspended from the ceiling on monofiliment line. As the new curator I am > somewhat concerned about the aging properties of the line as some of the > aircraft are heavy. We have used various lines, from 20 to 50 lb. in > strength. Any information would be of considerable help. > > Michael Smith > Curator > [log in to unmask]