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Old 5th March 2007, 07:53 PM   #1
Coffee is offline Coffee  Czech Republic
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Default HDPE diaphragm

Did anybody try to use a HDPE foil instead of a mylar foil for a ESL diaphragm? I have occasion to buy very cheap a 7my HDPE foil.

Will it work well as a diaphragm?

thanks coffee
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Old 5th March 2007, 07:56 PM   #2
SY is offline SY  United States
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It's not very shrinkable and somewhat crinkly sounding, but if it's free, it's worth a try.
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Old 5th March 2007, 07:59 PM   #3
Coffee is offline Coffee  Czech Republic
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thanks SY.

IŽll try it soon, I hope.

IŽll use some form of diaphragm damping in form of star shaped spacers made of adhesive foam tape, similar to that manger use for its diaphragms.

It could help to get rid off this, if this sound is caused by some form of resonance, because of lower internal damping of HDPE IMHO.
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Old 5th March 2007, 08:24 PM   #4
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Default Probably not your best bet...

PE does not have the strength nor stretch/memory qualities of "C' grade Mylar. If you can get some cross linked HDPE that would help some. Other wise as Sy says you can try it and it will work. That said the effort envolved is such that I don't know why you feel you need to try and reinvent the wheel . Using 3-6 micron tensilized polyester film is where you want to be and it's not all that expensive to buy in small quantities. Low mass high strength thin film are the order of the day with ESL's.
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Old 5th March 2007, 08:34 PM   #5
Coffee is offline Coffee  Czech Republic
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I dont want to reinvent the wheel,but it is not so easy for me to buy a mylar film in my country.
thanks for advise.
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Old 5th March 2007, 08:39 PM   #6
SY is offline SY  United States
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I have some connections in the plastics business in the Czech Republic. I'll ask around a bit and let you know if I find something.
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Old 5th March 2007, 08:44 PM   #7
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thanks a lot SY
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Old 5th March 2007, 09:22 PM   #8
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Default could not be easier...

there are members on this forum that can sell you what you want on line or by the post. Delivered right to your door. You don't even have to leave the house.
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Old 6th March 2007, 11:53 AM   #9
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Hi,

I could send you a solid tube containing the Mylar from Holland, but I am forced to calclulate 17,50 euro for package and transfer.

Best regards, M.J. Dijkstra

mj-dijkstra@zonnet.nl
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Old 6th March 2007, 12:06 PM   #10
Zvon is offline Zvon  Australia
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HDPE would be a poor material selection for an ESL membrane because:

1. Poor mechanical properties
2. Creep/relaxation
3. Non-linear stress-strain relationship
4. Try heatshrink and you'll get a heat-sag (I use mechanical tensioning)
5. Glueing/coating problems

HDPE is good for pond lining, geotextiles, geofabric etc. but not for ESL membrane.

Better purchase some mylar from Martin or Rob or ask Mark nicely for some Lumilar (if memory serves well).

Regards,
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