[JErwin]

Over the past year, I have purchased some Spey-sized reels on eBay that have backing on them. In at least two cases, the backing looks new and usable. My question is this: Is there any easy way to tell if the backing is 20 lb or 30 lb? Thanks for the help.

JE

 

[SSPey]

If both are dacron backing, the diameters are quite different, and they roughly approximate monofilament. The 30 lb dacron should have a diameter similar to a steelhead/salmon leader butt (~30 lb test), whereas the 20 lb dacron diameter approximates a leader midsection-tippet area (~15 lb test).

If you are asking about testing the strength of the material, I can't help.