thermistor and heatsink compound I've just bought a new thermistor for my 3-D printer hot end the previous person who owned the machine put heat sink compound in the hole where the thermistor is located does this contaminate the sensor and give false readings or should that be fine please bear in mind that there is a 2mm bear wire gap from the sensor to the start on the insulation please not if a was to use heat sink compound it will be the white stuff https://reprap.org/forum/read.php?1,888950,888950#msg-888950 Mon, 14 Sep 2026 02:30:55 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,888950,888959#msg-888959 Re: thermistor and heatsink compound https://reprap.org/forum/read.php?1,888950,888959#msg-888959
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leadinglights
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the_digital_dentist
Heatsinks normally don't get much over 60-70C.

It seems unlikely that heatsink compound of any type is intended to work at hot-end temperatures,..........................................................................................

I disagree

[reprapworld.co.uk]

Note that I know nothing about this compound's electrical resistivity at hotend temperatures as my hotends use thermocouples for temperature sensing and these are relatively insensitive to electrical leakage.

Mike

I use boron nitride paste, but I don't pay that obscene price for it. It's good to 850C. The only complaint I have about it is that it is water based, and doesn't really want to stick to anything. Once it's dry, it's kind of a chalky powder, and doesn't conduct electricity at any temperature within its useful range (when dry). Even when still wet, it's not conductive enough to cause any damage to heaters or thermistors.]]> rq3 General Sat, 02 Apr 2022 15:28:08 -0400 https://reprap.org/forum/read.php?1,888950,888957#msg-888957 Re: thermistor and heatsink compound https://reprap.org/forum/read.php?1,888950,888957#msg-888957 VDX General Sat, 02 Apr 2022 13:22:32 -0400 https://reprap.org/forum/read.php?1,888950,888956#msg-888956 Re: thermistor and heatsink compound https://reprap.org/forum/read.php?1,888950,888956#msg-888956
Quote
the_digital_dentist
Heatsinks normally don't get much over 60-70C.

It seems unlikely that heatsink compound of any type is intended to work at hot-end temperatures,..........................................................................................

I disagree

[reprapworld.co.uk]

Note that I know nothing about this compound's electrical resistivity at hotend temperatures as my hotends use thermocouples for temperature sensing and these are relatively insensitive to electrical leakage.

Mike]]> leadinglights General Sat, 02 Apr 2022 12:54:35 -0400 https://reprap.org/forum/read.php?1,888950,888954#msg-888954 Re: thermistor and heatsink compound https://reprap.org/forum/read.php?1,888950,888954#msg-888954
It seems unlikely that heatsink compound of any type is intended to work at hot-end temperatures, and will probably decompose quickly (accompanied by dripping, smoke, and stink). I always use antiseize compound (from auto parts store) on everything that is mounted in the heater block. I'm not sure it's intended to be used at hot end temperatures, and it does smoke at first, but it has always prevented the screws/nozzle/heatbreak/thermistor/PT100 sensor from getting locked in.]]> the_digital_dentist General Sat, 02 Apr 2022 12:03:13 -0400 https://reprap.org/forum/read.php?1,888950,888951#msg-888951 Re: thermistor and heatsink compound https://reprap.org/forum/read.php?1,888950,888951#msg-888951
Mike]]> leadinglights General Sat, 02 Apr 2022 09:59:35 -0400 https://reprap.org/forum/read.php?1,888950,888950#msg-888950 thermistor and heatsink compound https://reprap.org/forum/read.php?1,888950,888950#msg-888950
please not if a was to use heat sink compound it will be the white stuff]]> pcmad General Sat, 02 Apr 2022 09:39:15 -0400