PF120's are a cheap plastic frame. They are a little on the flimsy side. Often, the top bar will be warped.
I want a sturdy frame if I am going to be extracting honey from it. I have several Pierco frames in my honey supers. Pierco frames seem sturdier to me than PF120's, and I have had Pierco frames full of honey and it felt awfully flimsy to me. I have even had a couple end tabs on Pierco frames break off when I was pulling a frame out. I have not tried using PF120's in honey supers, and I don't intend to try.
PF120's are 4.9mm cells. I see zero benefit to having small cell foundation in honey supers. When bees are allowed to draw cell sizes of their own choosing, for honey storage they draw large cells that are drone comb cell size (or larger).
I consider PF 120's to be brood comb frames. If used for that purpose, they seem to do a good job.
If you are worried about chemical contamination of wax, buy unwaxed Pierco frames, and 'paint' a layer of clean melted wax on the frame to get the bees to draw it out faster. (The waxed Pierco frames have very little wax, so I put a layer of wax on them for better acceptance. I've never tried the unwaxed Pierco frames.)
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