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Difference between HDPE vs polyethylene plastic
I was trying to purchase some bottles for shampoo from a supplier from another country.
They said the material is polyethylene.
When i searched google, i got the idea that polyethylene is HDPE. But the supplier says it is not HDPE. It is polyethylene.so is polyethylene the same as HDPE or they are different materials?
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11 Replies
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HDPE is high density polyethylene, it is polyethylene but has different properties than lower density
https://sciencing.com/differences-hdpe-plastic-polyethylene-plastic-6807965.html
https://omicoplastics.com/blog/ldpe-hdpe-similarities-and-differences/ -
evchem2 said:HDPE is high density polyethylene, it is polyethylene but has different properties than lower density
https://sciencing.com/differences-hdpe-plastic-polyethylene-plastic-6807965.html
https://omicoplastics.com/blog/ldpe-hdpe-similarities-and-differences/thanks a lot
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they say these are polyethylene bottles. are these HDPE? -
These would appear to be Polyethylene Terepthallate (PET), not HDPE
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they said we have two types plastic. Polyethylene and PET.
this one is PET. So the bottles above would be something other than PET.
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they also make these jars from that plastic they call Polyethylene. -
PE in HDPE stands for polyethylene. HDPE bottle is not transparent. PET, HDPE, LDPE are different grades of PE. as I know.
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amitvedakar said:PE in HDPE stands for polyethylene. HDPE bottle is not transparent. PET, HDPE, LDPE are different grades of PE. as I know.
i also thiks so. but as they said this is polyethylene, i thought maybe they are calling HDPE as polyethylene.
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What they are calling Polyethylene is almost certainly LDPE (Low Density Polyethylene) which is used in packaging. HDPE is generally used for rigid structure items such as cutting boards. It sounds as though this supplier may not know the difference between LDPE and HDPE.
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@Abdullah HDPE is used in bottles indeed. They are formed by straight chains of ilyethylene molecules of different chain lenght (molecular weight). By changing the average molecular weight, you can get vary the rigidity of the bottles. Also, since polymer molecules are straight, they pack better and prevent light from going through more efficiently, giving a more solid opaque white color (which can be mixed with pigments, like in the first three images you showed).
Low density polyethylene consist of straight and branched polyethylene molecules, which prevents them to pack tightly, being more flexible than HDPE and letting a bit more light to go through. That’s why plastic bags are “slightly” transarent.
PET is a different type of polymer, and is completely clear (can be coloured though). It’s also very shinny on the surface.
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MarkBroussard said:@Abdullah
What they are calling Polyethylene is almost certainly LDPE (Low Density Polyethylene) which is used in packaging. HDPE is generally used for rigid structure items such as cutting boards. It sounds as though this supplier may not know the difference between LDPE and HDPE.
that may be the case.
thanks
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