Nicotine reidue on drivers

An individual on Audiokarma had a pair that were very nasty looking and cleaned them up with dish soap, water and a soft cloth.

https://audiokarma.org/forums/index.php?threads/yamaha-ns-1000m-drivers-cleaning-and-rufurbishment.6...

I was under the impression the Beryllium was vapor deposited onto a copper plated aluminum mold. I believe the vapor deposited Beryllium was only 0.03 mm thick (about twice the thickness of Al foil).  If it was free standing, it would certainly be very fragile because Beryllium is very brittle.

Whether they are free standing or on a polymer base, I would be very careful with them.

I forgot to add, vapor deposited Beryllium would never adhere to polypropylene without a surface treatment. Typically we would use an oxygen plasma treatment of the polypropylene before vapor deposition of a metal such as Beryllium.

George, I was not disputing what you observed. In fact what you observed is what would happen if the Beryllium was vapor deposited onto an untreated or poorly treated polypropylene surface. I was just commenting on the need to introduce reactive bonding sites on the polypropylene surface for the vapor deposited Beryllium to bond with.