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Mixing LDPE & HDPE ?????

This topic contains 2 replies, has 3 voices, and was last updated by  Ravi Bhanushali 8 months ago.

Yustina salnikova yustina

Mixing LDPE & HDPE ?????

11/07/2018 at 19:56

Can LDPE & HDPE be mixed?

I can’t find clear research. But in my experiments it has been working fine.. however I am highly interested in the long term stability of the mixture.

I understand that their polymer structure is different (linear vs. non linear) and I want to know how a composite will hold up (i.e. UV resistance, durability, flex, etc).

Anyone have any insight on this??

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14/07/2018 at 05:47

@yustina. Mixing these polymers should be just fine. Basically you are making a new type of MDPE. medium density. There are quite a few other polymers mixed together that we don’t even know about. The challenge you will have is that you probably will not get a good mixture unless you grind them up then run them thru the extruder and then grind it again and then mold your product. This should produce a good mixture.
The final properties will depend on the start properties and the only way to really know that will be to build test samples and do the tensile, flexural and impact testing to understand. UV resistance will only be there if the original polymers has it or you add the UV additive.
Please be careful when using the terminology “composite”. That refers to any resin with glass, carbon or other fiber added. Two polymers together are “alloys” or co-polymers.
Also, polypropylene can be a homopolymer or a copolymer. Homo means only polypropylene, Co- means polypropylene alloyed typically with polyethylene.

I hope this helps!

17/07/2018 at 18:52

Actually it’s not a good idea to mix them together , here in India people do it to save the cost . But in long run it doesn’t work out well  .the properties of both the plastic are different. Ldpe is more like soft and has elasticity, where as HDPE is soft but you can’t stretch it. You can mix HM plastic grade with LDPE it works fine with it . This both are mostly use in liner grades like making groceries bags ,  Medical glucose bottles. HDPE is less recative to most of the chemicals , where as LDPE is reactive to few chemicals , when in contact it can Melt and mix with the chemicals. Here in India HDPE is use to make packing containers for lot of stuffs .
. Let me know if I can help you in any way.
I am a Recycler by profession.

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