General > General Technical Chat
Silicone vs. PVC measuring leads
David Hess:
--- Quote from: tooki on May 06, 2024, 07:46:21 pm ---Nobody sells multimeter test leads with PTFE (Teflon) insulation because Teflon is way too stiff. Consequently, nobody makes really finely stranded wire with Teflon.
--- End quote ---
Finely stranded Teflon insulated wire does exist, and in every color. We used it in high temperature applications. But I have no idea where we sourced it from.
tooki:
Finely stranded? Easy. Really finely stranded? I have never seen it in PTFE.
For example, for 24AWG/0.25mm2:
Regular stranded: 7 strands
Fine stranded: 19 strands
Very fine:~ 40 strands
“Really fine”: ~65-130 strands.
There’s simply not much point in the higher strand counts because their flexibility is lost on the PTFE. 19-strand 24AWG PTFE is readily available, but I’ve never seen or heard of finer ones.
m k:
What material is the one that US electrical wiring has and some ants like to use for other purposes?
Or are they just boosting vibes, wonders a curious mind.
David Hess:
--- Quote from: tooki on May 08, 2024, 12:02:56 am ---Finely stranded? Easy. Really finely stranded? I have never seen it in PTFE.
For example, for 24AWG/0.25mm2:
Regular stranded: 7 strands
Fine stranded: 19 strands
Very fine:~ 40 strands
“Really fine”: ~65-130 strands.
There’s simply not much point in the higher strand counts because their flexibility is lost on the PTFE. 19-strand 24AWG PTFE is readily available, but I’ve never seen or heard of finer ones.
--- End quote ---
The wire was probably 24 AWG (I never measured it and I do not think the spools were marked.) and definitely had at least 40 silver plated strands. It was used for internal wiring of load cells between terminal strips and Teflon insulation had to be used because part of the manufacturing process included baking in an oven after assembly. I assume finer stranding was used to get as much flexibility as possible in a confined space. The wire might have been custom ordered and not a standard product, because the economy of scale when manufacturing is such that custom orders do not cost any more than standard ones.
Zero999:
--- Quote from: wraper on May 05, 2024, 03:56:45 pm ---PVC wires become very stiff at low temperatures, and can even snap when bending if it's like -30oC
--- End quote ---
Does the LCD even work at such low temperatures?
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