4
\$\begingroup\$

On the picture from this question, what is the translucent insulation on the transformer center-tap made from? It looks like polyethylene, but it obviously isn't because PE would melt at soldering temperatures.

enter image description here

\$\endgroup\$
  • \$\begingroup\$ Some kind of silicone rubber? can PTFE be made translucent with additives to lower its density? Interesting question! \$\endgroup\$ – Joren Vaes Jan 14 at 9:42
6
\$\begingroup\$

That looks very much like PTFE tubing. The thin-walled tubing tends to be translucent, but the degree of translucency also varies by manufacturer and even batch.

PTFE can operate up to 260°C continuously. Transformer tails like this are typically tinned onto the bobbin pins by solder-pot dipping, we use 255°C for our lead-free solder pots and the sleeving does not directly touch molten solder which leaves enough margin. As well as soldering you have to also remember that the maximum internal temperature of these type of high-frequency transformers can exceed 100°C which will limit your sleeving material choice too.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.