What Is O-Polyphenol(Opp)?

If you want to post a link to what you are talking about, that might help.

I am betting that if you have seen the letters "OPP," it is referring to a type of polypropylene (oriented polypropylene) where the manufacturing process roughly aligns the polymer chains to impart different mechanical properties.

If you aren't already aware, polypropylene is a commodity plastic/polymer much like polyethylene. It is generally recognized as being both cheap and inert, and consequently used all over the place, including food containers. It might even be that your current banknotes are made of the BOPP (biaxially oriented) form.

Collector28,

I think I found the product, or something very similar. After studying the product description, I can tell you what your problem is:

You just can't understand incorrect and poorly translated polymer chemistry nomenclature hybridized with sales gibberish! Geez!

Of course, I am a chemist, and it hardly made a lick of sense to me, too!

I wish more people would read, question, and research descriptions that don't make sense, as you did. It would make some sellers clean up their act.

All I can figure is that the seller typed something like "opp" and "chemical" into a search engine and got o-phenylphenol (or similar equivalent names) in the results ahead of the common plastic/polymer that they were looking for. I tried it, and got that result sometimes. They then ran with that, even if it didn't make any sense. If I saw the same description you did, they also mention their product is "without softener," which must mean "free of plasticizer." After seeing that, I question the accuracy of everything else in the description.

It just about has to be oriented polypropylene, or maybe a cheaper, nonoriented garden variety polypropylene. If I am wrong and it isn't that, I would question the product's safety, too.

BTW: PVC was in the description of the pages. Some of us coin people go ! Maybe that is okay for banknotes?

You are most welcome.

Considering that I pickup coins from the UK now and then, I may be picking your brain one of these days!

I haven't gotten much beyond early twentieth century, yet. My ultimate ambition is to go back to at least the 17th century, but I haven't decided how that is going to look.

I enjoy history, and for me, as an American, coins are the most tangible link to our past. We don't see (or feel crushed by the weight of it, as a French friend tells me) the physical relics you do everyday. Because of the events in the last 250 years or so of French history, I am collecting representative examples of all the French governments over that time period. My home state was a part of Nouvelle-France for about as long as the US has existed, and French influences persisted in American history, hence my interest there.

But the British history that parallels US history does not have such radical gyrations and divisions. So do I: Collect by monarch? Time period/major events? Currency types that were used in colonial and early American trade? So many interesting possibilities! Your thoughts?