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Thanks Matt. BBSA is "almost insoluble in water" so it's not that. I'm pleased about that as BBSA is a neurotoxin! This stuff wipes off with a damp cloth. When I looked at the dates on it it's about 2 years old (doesn't time fly...) and it's been stored in a warm place, so that could be a...

Thanks Pat. It has a very bitter taste (yes, I couldn't resist licking it) which ties in with it being caprolactu[a]m. Interestingly the makers, Copely, recommend it for the transfer of food substances and liquids. Maybe they treat the inner surface in some way to stop the plasticiser leaking...

I have some "extraflex" nylon pneumatic tubing which is quite nice for connecting components inside equipment because of its flexibility. I have noticed that after a few months it gets a coating of what I assume is plasticiser on it. You can't see it but you can feel it - it's greasy / sticky, a...

Related to my previous post - Can anyone tell me the meaning of the term co-energy, with respect to a magnetic system? It vaguely rings a bell from my school physics many years ago, but I couldn't find a definition anywhere on the web. Even Wikipedia doesn't have an opinion, which is a first...

I have downloaded the trial version of this excellent software, and have been having fun designing an electromagnetic actuator. I want to simulate a static DC current flowing in the coil. Using a simple ACDC current source the parameters are magnitude (in Amps rms) and phase (in degrees). The...