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ABS plastic degradation (brittle) - HP34401A (circa 1992)
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kosine:
Certainly some polymers are not long term resistant to hydrocarbons, and plastic gas pipes are usually made from some variant of PE for precisely that reason.

In theory, use of gas lighters near domestic plastics shouldn't be of much concern, but not all the gas gets completely combusted, and some also gets released pre-ignition on worn out lighters. So there might be a modest case to answer here, though I suspect it would only be a marginal contribution.

Another possible factor (that I've not looked into) is background radiation, which in theory could also embrittle plastics. In homes built on granite formations use of radon detectors is not uncommon, so after many years in such environments there could be some affect on polymers too.

The transparent housings for the lighter in the picture is usually polystyrene (because it's cheap), and it is susceptible to hydrocarbon attack. I doubt the manufacturers expect them to be in use long enough for it be a problem, though.
kosine:
Not an expert on 3D printer filaments as such, but certainly in the case of PLA, the addition of plasticisers is fairly common. Lots of options, but sorbitol is not unusual with biodegradable/compostable plastics. It's a good choice because it melts at about 100C and is quite a lot easier to work with than liquid-based alternatives. Anything up to 15% is typical, and in some cases it's possible to test for it by just microwaving the plastic to see if melts or softens significantly.
free_electron:
brown or grey handle ? i know the darker (brownish) handles crack easily. had several fail on the older gen 54645D scopes.
lugaw:

--- Quote from: kosine on June 14, 2022, 04:28:54 pm ---Not an expert on 3D printer filaments as such, but certainly in the case of PLA, the addition of plasticisers is fairly common. Lots of options, but sorbitol is not unusual with biodegradable/compostable plastics. It's a good choice because it melts at about 100C and is quite a lot easier to work with than liquid-based alternatives. Anything up to 15% is typical, and in some cases it's possible to test for it by just microwaving the plastic to see if melts or softens significantly.

--- End quote ---


I am talking about the new trend of mixing 3D resins used on SLA printers with the new flexible resins, because the standard resin is very brittle. Mixing it with 5 to 10% flexible resins make it a bit pliable and the tiny toy figures wont break if you drop it.
lugaw:

--- Quote from: free_electron on June 14, 2022, 04:59:05 pm ---brown or grey handle ? i know the darker (brownish) handles crack easily. had several fail on the older gen 54645D scopes.

--- End quote ---

Mine is darker (brownish) handle on a HP34401A
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