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Does anyone know dielectric constand for PEBAX?

J

Joerg

Jan 1, 1970
0
Subject line says it all. I've asked several times at vendors, no luck.
They always think it's dielectric strength, but I need to calculate a
capacitance.

Only need a ballpark number.
 
J

Joerg

Jan 1, 1970
0
Phil said:
A search on PEBAX + permittivity turned up a few things, e.g.
http://tinyurl.com/afafwz7 . Looks like about 13 at low frequency and 3
at 1 MHz. Yecch.

Thanks, didn't think about the word permittivity because that was never
used at my schools. 13 would be ugly. The question is where does it
begin to rise? I need to operate in the 150-400kHz range. Maybe I just
assume 4 and knock on wood :)
 
T

Tim Williams

Jan 1, 1970
0
Phil Hobbs said:
Given that it's a polyamide block copolymer, I'd be concerned about
water absorption. (Think nylon.)

Agreed. My chemistry knowledge says it should behaves something like
nylon. Not sure what the polyether part would do, electrically, but hey,
it's in the ballpark. :) That would put the loss tangent around 1% and K
around 4 or so. You wouldn't want to take it into the microwave, but I
doubt it'll melt from 400kHz applied to bulk material.

Tim
 
J

Joerg

Jan 1, 1970
0
Phil said:
Given that it's a polyamide block copolymer, I'd be concerned about
water absorption. (Think nylon.)

It ain't my choice, and it's actually going into the blood stream. It's
a sheath, a standard medical utensil in the world of catheters that goes
in before anything else does. I already dread the lead vests during
clinicals, those give me a back pain.

Note to self: Must lose weight before that.
 
W

Wimpie

Jan 1, 1970
0
El viernes, 1 de febrero de 2013 02:22:59 UTC+1, Joerg escribió:
Subject line says it all. I've asked several times at vendors, no luck.

They always think it's dielectric strength, but I need to calculate a

capacitance.



Only need a ballpark number.



--

Regards, Joerg



http://www.analogconsultants.com/

Hello Joerg,

You may visit matweb
http://www.matweb.com/Search/MaterialGroupSearch.aspx?GroupID=51

Depending on chemistry (formulation) Dielectric Constant seems to vary between 4 and 9.5 (general page on PEBA on matweb).
 
J

Joerg

Jan 1, 1970
0
Wimpie said:
El viernes, 1 de febrero de 2013 02:22:59 UTC+1, Joerg escribió:


Move to Spain for the winter to escape the cold? :)

Hello Joerg,

You may visit matweb
http://www.matweb.com/Search/MaterialGroupSearch.aspx?GroupID=51

Depending on chemistry (formulation) Dielectric Constant seems to
vary between 4 and 9.5 (general page on PEBA on matweb).

http://www.matweb.com/search/DataSheet.aspx?MatGUID=18fb730e5ed8471cad1116daa7c85828

Hmmm ... where did you find the dielectric constant in there?
 
W

Wimpie

Jan 1, 1970
0
El 01-02-13 19:30, Joerg escribió:
Move to Spain for the winter to escape the cold? :)



http://www.matweb.com/search/DataSheet.aspx?MatGUID=18fb730e5ed8471cad1116daa7c85828

Hmmm ... where did you find the dielectric constant in there?

I copied the wrong link...

The general data is in:
http://www.matweb.com/search/DataSheet.aspx?MatGUID=57b805a667ee48f7b58b3fd8df1fa17b

It mentions 4 to 9.5

From the list of products, click on of the products with the red dots
(EMS Grivory).
http://www.matweb.com/search/DataSheet.aspx?MatGUID=1c7c7eccbcc24fb8b7049bccbfaa5ea4

This will show you product data.

You are right, the wheater in Spain is better then the rain over here
(around 20 degr. C. in Malaga).
 
J

Joerg

Jan 1, 1970
0
Jim said:
Datasheet E-mailed to you.

I didn't have any problems creating an account using a temporary
E-mail address which I then deleted from my forwarding system >:-}

Thanks, Jim. Got it.
 
J

Joerg

Jan 1, 1970
0
Wimpie said:
El 01-02-13 19:30, Joerg escribió:

I copied the wrong link...

The general data is in:
http://www.matweb.com/search/DataSheet.aspx?MatGUID=57b805a667ee48f7b58b3fd8df1fa17b


It mentions 4 to 9.5

I think I'll assume 7 for now and call it a day. If I provide enough
margin in the calcs it should be ok.

From the list of products, click on of the products with the red dots
(EMS Grivory).
http://www.matweb.com/search/DataSheet.aspx?MatGUID=1c7c7eccbcc24fb8b7049bccbfaa5ea4

Says "only available to premium members".
This will show you product data.

You are right, the wheater in Spain is better then the rain over here
(around 20 degr. C. in Malaga).

Wish I was there ...
 
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