>-----Original Message-----
>From: James, Chris [mailto:[email protected]]
>Sent: Thursday, October 25, 2001 3:04 AM
>To: Price, Ed
>Cc: 'EMC-PSTC List'
>Subject: RE: Fish paper
>
>
>
>We have found that some of these vulcanised paper cards can be
>hydroscopic
>and result in leakage problems.
>
>A modern alternative is material such as Dupont Nomex 410.
>
>Chris
>
>-----Original Message-----
>From: Price, Ed [mailto:[email protected]]
>Sent: 25 October 2001 04:05
>To: 'EMC-PSTC List'
>Subject: Fish paper
>
>
>
>Here's an interesting reference to fish paper, from the Rane
>Audio Reference
>site:
>
>http://www.rane.com/digi-dic.html
>
>fishpaper An insulating paper, often fiber- or oilcloth-like,
>used in the
>construction of transformers and coils. [Historical Note: EP
>Coughlin of LMC
>Plasticsource <http://www.lmcplasticsource.com/> writes:
>"Although my roots
>go back in fibre to 1959 I have never seen any hard copy
>evidence noting the
>origin of the name 'fishpaper.' My initial experience in the
>fibre industry
>was with Taylor Fibre Company and the owner claimed roots back
>to Thomas
>Taylor of England who is credited with 'inventing' vulcanized fibre.
>Original patent was in Great Britain in 1859 and Thomas Taylor
>received a US
>patent in 1872 titled 'Improvements in the treatment of paper and
>paper-pulp.' The major use for vulcanized fibre eventually was in the
>electrical insulation field but, obviously, requirements for
>same did not
>exist in 1859. Although anecdotal, John Taylor (owner/founder
>of The Taylor
>Fibre Company) claimed that vulcanized fibre's initial use was
>in England's
>fish markets as table / bin liners. The resistance to fish oil
>and tearing
>of vulcanized fibre makes this a very plausible story."]
>
>Regards,
>
>Ed
>
>
Chris:
You are quite right to point out that limitation of fishpaper. About 30
years ago, I was involved in designing miniature EMI filters using
multi-layer discoidal ceramic capacitors. A couple of rings of fishpaper
were included to space a small toroidal inductor away from one face of the
capacitor. We traced problems with potting-epoxy curing to trace finger-oil
and moisture contamination from handling the fishpaper. We did a temporary
fix by requiring all handling of the fishpaper be done with gloved hands.
Later, we switched to a high-temperature nylon-like plastic.
Ed
Ed Price
[email protected]
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA USA
858-505-2780 (Voice)
858-505-1583 (Fax)
Military & Avionics EMC Services Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis
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