This discussion is going all over the place.
We all know by now that conservators will get you for using anything new.
If you're framing someone's new needlework by all means use the nylon tags and no one is going to fault you, except a professional from the local conservatory. But you should use them anyway because we're never going to get them to come around.
If you're framing valuable antique sampler you have to use traditional methods.
In marking down for using Pat's hardware the judges are doing exactly what the conservators would do.
Do this as an exercise. Email your local conservator
http://www.conservation-us.org/index.cfm?fuseaction=Page.viewPage&pageId=495. (We have a really great place here by the way. And I say that without an ounce of sarcasm - just want to be clear - they are great. The Intermuseum Conservation Association. One of their staff posts here.)
So email a place like that in your area and tell them you use Artcare Restore foam board as backing instead of coroplast. They'll tell you you're flat out wrong to be doing so.
We all know you're not wrong. But they are working on a different level. And so when you frame an actual work on paper of true value I'd suggest using 8 ply museum rag as a mount board and coroplast as a support board, sealing it all off with 3m 850 polyester tape. Museum mat goes without saying and OP3 acrylic.
If it's taken to an appraiser in the future or some damage happens to it and it's taken to a conservator using the Artcare Restore can only get you into trouble if they tell the owner that improper materials were used.
And, again, we all are of the opinion that Artcare Restore is not an improper material. But in that situation we are no longer the person who counts. So don't use it.
I didn't pick that situation out of the air. I got into a disagreement about the use of Artcare Retore with them and it was very cordial and I developed a lot of respect for them by the end, but it did kill my use of Artcare Restore instead of archival coroplast for expensive objects because no authority be it a collector or a judge is going to take my side over theirs.
So Pat... please realize that any new materials undergo the same amount of discrimination. I guess some of it has to do with the safety of old methods being time tested. My cynical side says some of it has to do with politics. Some of it has to do with conservators being, well... conservative. (not politically)
Anyway, this would be an insurmountable uphill battle for you. But if you can get the conservators on your side (you can't) then you might have a shot.