Why did pathology companies change from glass tubes to plastic?
Answer:
Just like everything else, they are made of recycled material and therefore cheaper. Not to mention, they are shatterproof which if you have ever worked in health care, you know how important universal precautions are!
They started using them because they came sterilized and could be thrown away. They were supposed to be a saving, but secure landfills have many, still not degraded. They generally do not recycle anything that is considered medical waste.
I would look under hematology history or phlebotomy.
Glass is very fragile. If you want a stronger one, you have to make it with +2 cm thick with special coating(s).
In plastic, you can modify its molecular structure to obtain strength or heat-resistance. Like Kevlar, it made from some sort of plastic but can resist shotgun shot only about 1-15 mm and you can make it a bit flexible.
plastic It is cheaper, easier to handle, lighter when carried, and permits the impregnation of the inner wall more easily, with preservatices for blood like heparine coat, calcium oxalate, etc..
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