same

[Jimmy Stewart ...]

is Paxolin the same as bakerlight ? ...

[S]

bakerlight?

Is this so bakers can see their dough in the dark during a power cut?

[Andy Bennet]

Dunno - isn't Paxolin some kind of sage and onion stuffing?

[T i m]

Wrong group again?

Cheers, T i m

[Chris Green]

No, not if my memory serves me right.

Paxolin is the sort of stuff that tag boards and early printed circuit boards were made of. I.e. it's brown and sort of laminated.

Bakolite is an early plastic that was used to make moulded items like plugs etc. It's often dark brown but doesn't have to be, it's quite hard and doesn't melt, it chars if you make it very hot and smells.

[jon]

NO

[charles]

"bakelite". Used for radio cases, telephones, etc.

[Jimmy Stewart ...]

ebay spelling

[Jimmy Stewart ...]

no no

[Jimmy Stewart ...]

thanks

[Chris J Dixon]

Indeed. Officially I think it is SRBP

Synthetic Resin Bonded Paper industrial laminate

Available in two grades, only one being suitable for high voltage applications.

When GEC took over AEI, guess who built a set of AC locomotive 25 kV tapchangers with the wrong grade, because of different factory norms. There was a bit of a bang! :-(

For greater physical strength there is also SRBF, which has fabric reinforcement.

Chris

[Bob Eager]

Synthetic Resin Bonded Paper, I think.

[Dave Plowman (News]

I think it is made from layer of paper.

It's also very brittle. Would say not suitable for a PCB etc. Best quality ones of those these days are glass fibre.

[Jimmy Stewart ...]

ta much

[Andy Burns]

Ah, the nostalgic smell of junior hacksaw on veroboard ...

[Jimmy Stewart ...]

hated veroboard...nothing I ever made with it worked ......

[Andy Burns]

aka FR2, I think

aka FR4

[Fredxx]

I'm assuming here that while the name Bakolite has been used this refers to the more common term Bakelite? The difference being through confusion of trade marks.

While Bakelite is a resin, the items we see called Bakelite are actually also a moulded laminate though can be any filler.

Paxolin is a normally a sheet with paper as the filler material, or SRBP.

[S]

Ah bakelite.....!

Its the trade name for phenolic resin which is made by a reaction between phenol and formaldehyde.

Was developed around the 1910's by Leo Hendrik Baekeland following previous work by Adolf Von Baeyer and the General Bakelite company was founded in 1910.

[Fredxx]

I recall many old TVs would have SRBP, which cost a few pennies less than SRBF. It was always single sided with a few wire links for those difficult routes. No plated through holes and lots of dry joints!

I can't recall the last time I saw a SRBP board.