In Reply to: RE: Mylar posted by pictureguy on June 14, 2017 at 13:04:36:
Metal-film laminates use to require a rather thin layer of metal on a thicker plastic film. Magnepan bass drivers use to have thick conductors in order to achieve a high efficiency with weak magnets. I think a bass driver using the concept of BG Neo would be very expensive.
Found this on plastic film:
"Originally Posted by LineSource
Hi Paradise_Ice
Dupont Mylar and Kaladex Polyester films, and Dupont Kapton Polyimide film are probably the most commonly used materials for planar and ribbon speakers.
Dupont Mylar has a Glass Transistion temperature Tg of 80 C
Dupont Kaladex has a Glass Transistion temperature Tg of 122 C
Dupont Kapton has a Glass Transistion temperature Tg of 360 C
Mylar can be found down to 2 microns in thickness, and 2.5, 3.6, and 5.0 micron mylar is pretty easy to find. The low Tg makes it a poor choice for high power metal-film laminates
Kaladex is harder to find below 7.6 micron thickness. Many new planar and ribbon speakers have converted from mylar to Kaladex films for the higher Tg.
Mylar and Kaladex are pretty "quiet" when you vibrate them.
Kapton is easy to get at 7.6 micron. 3.8 micron is also made by Dupont, but you may have to go directly to Dupont for purchase. Kapton's high Tg and melting point of over 400 C make it a very good material for high power planar and ribbon speakers. Kapton is also a good substrate for sputtering metals like Aluminum or copper. Many flexible PC boards use Kapton, as it is safe to solder to without special materials.
Kapton is a little "noisy" when you vibrate it.
There are a wider range of adhesives for Mylar/Kaladex than for Kapton.
mylar 1360 kg/m3
kapton 1535 kg/m3
Aluinum 2700 kg/m3"
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Follow Ups
- RE: Mylar - Roger Gustavsson 04:39:53 06/15/17 (1)
- RE: Mylar - Satie 11:07:40 06/15/17 (0)