Originally Posted by mdriftmeyer
Why anyone would switch from glass baby bottles to plastic still baffles the mind. Go into a Chem lab. You won't see their main mixing beakers made from plastic. They are all glass and for good reason.
Not true. There are quite a few lines of plastic labware. They can be more expensive than glassware. But, they aren't usually made of PVC, though the chemical tanks on most of my film processors were made of that.
Some of the materials in use for this are:
ECTFE, ETFE, FEP, FLPE, FLPP, HDPE, LDPE, NYL, PPCO, PC, PETG, PK, PFA, PMMA, PMP, PP, PS, PSF, PTFE, PUR, PVC, PVDF, TPE, XLPE
There are others, for more exotic uses, but these are the more common ones. They are from my Cole-Palmer (www.coleparmer.com
) Lab catalog.
People here are confusing the "hard" PVs with the "soft" PVC's.
These are very different.
The soft PVC's like the ones used in car seats, coverings for wires, etc., have plasticisers that are given off. You can smell that in a new car. Those are considered to be dangerous. The hard PVC's don't use plasticisers that evaporate, but are given off, along with other dangerous compounds, when the plastic is heated a good deal, such as when being welded, or particularly when burned (very bad!). When I weld PVC, I wear an organic substance gas mask. That's required, though some don't do it.