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Q
how to tell polyethylene from polypropylene
I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
To differentiate polyethylene (PE) from polypropylene (PP), consider their physical properties and chemical resistance. Polyethylene is generally softer and more flexible than polypropylene. PE also has a slightly translucent appearance, while PP is often more opaque. A simple test involves floating the plastic in water; most forms of PE will float due to its lower density, whereas PP, with a density marginally higher, might also float but feels a bit stiffer and less flexible upon manipulation. Chemical resistance tests can also help; PE is less resistant to solvents compared to PP. For a more technical approach, consider a flame test. PE melts and drips with a blue base flame and smells like a candle, whereas PP melts similarly but has a somewhat dirtier burning smell. Always ensure safety when conducting flame tests.
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