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Re: Pot metal - was something else

From "Carlos E.R." <robin_listas@es.invalid>
Newsgroups comp.os.linux.misc, comp.sys.raspberry-pi
Subject Re: Pot metal - was something else
Date 2026-08-09 15:06 +0200
Organization Tebibyte_Retro_Gaming
Message-ID <7kamkmxbbe.ln2@Telcontar.valinor> (permalink)
References (14 earlier) <11556i1$ru2o$1@dont-email.me> <nrCcnW5QlNCDBOv3nZ2dnZfqnPSdnZ2d@giganews.com> <er0jkmx15p.ln2@Telcontar.valinor> <2didncCUv6RGUOr3nZ2dnZfqn_GdnZ2d@giganews.com> <1159rak$29hv8$7@dont-email.me>

Cross-posted to 2 groups.

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On 2026-08-09 14:20, The Natural Philosopher wrote:
> On 09/08/2026 01:47, c186282 wrote:
>>   The alloy does not seem very resistant to vibration.
>>    It's soft enough you'd THINK it would be, but its not.
>>
> The problem is mainly that its has no fixed composition, Its random non 
> ferrous scarp mainly. Use a magnet to get the iron and steel and melt 
> what is left over perhaps
> 
> 
>>    Most aluminum alloys and 300 series stainless are
>>    not super-good with vibrations either - though
>>    better than 'pot metal'. I've seen 'magnesium' tire
>>    rims crack too.
>>
> Pot metal is heavy and brittle in my experience.
> 
> Came across it back in the day in toys, carburettor castings, thermostat 
> housings..valve covers..all stuff that needed shape retention but no 
> great strength
> 
>>    Only steel - esp nearly pure iron - seems to stand
>>    up to vibration, but it's HEAVY. Some cast iron,
>>    like that previously used for engine blocks, can
>>    be pretty good but will fracture on a sharp impact.
>>    I've seen old cracked engine blocks too.
>>
> Cast iron is brittle.That's why they used to use wrought iron - but it 
> was expensive.
> Then making steel got super cheap and that was that. Whole generation 
> learned to treat and alloy steel to get almost whatever you want
> 
>>    Plastics - they start 'crystalizing'/decomposing
>>    the instant they're made.
> 
> Not all of them. Like steel, there is a huge range. There's many a radio 
> case made of 'Bakelite' or stuff skinned with 'Formica'  or floored with 
> 'linoleum'....still functioning
> 
> Epoxy and glass fibre PCBs dating from the 1970s are still OK, as are 
> phenolic resin items
> 
> PVC however is very short lived, In the sun

PVC is used here for window frames and blinds. I had a place with such, 
40 year old, and good. Yellowish, though. And more brittle.

> 
> Nylon is intermediate - UV ageing often gets it
> 
> Jury is still out on polycarbonate, ABS  and ASA.
> 
> In fact one of the eco gripes about plastics is that they *don't* degrade.

They fragment into microplastics.

> 
> Nevertheless there are plastic gobbling bugs thriving at the bottom of 
> the sea apparently, eating all those microplastics.
> 
> Beware the SweepingStatement...
> 
> 
> 


-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon "s|b" <me@privacy.invalid> - 2026-08-04 15:04 +0200
  Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Andy Burns <usenet@andyburns.uk> - 2026-08-04 17:03 +0100
  Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon c186282 <c186282@nnada.net> - 2026-08-05 01:53 -0400
    Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon "s|b" <me@privacy.invalid> - 2026-08-05 19:47 +0200
      Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-05 18:51 +0100
      Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-05 18:57 +0100
        Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon "s|b" <me@privacy.invalid> - 2026-08-05 20:14 +0200
          Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-05 19:49 +0100
            Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon "s|b" <me@privacy.invalid> - 2026-08-06 11:12 +0200
              Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-06 12:15 +0100
              Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon rbowman <bowman@montana.com> - 2026-08-06 18:22 +0000
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-06 21:39 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon rbowman <bowman@montana.com> - 2026-08-07 02:27 +0000
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-07 11:38 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Daniel James <daniel@me.invalid> - 2026-08-07 13:35 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-07 14:10 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Chris Green <cl@isbd.net> - 2026-08-07 15:02 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-07 16:32 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon wmartin <wwm@wwmartin.net> - 2026-08-07 11:01 -0700
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-08-07 19:16 +0000
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Robert Riches <spamtrap42@jacob21819.net> - 2026-08-07 19:27 +0000
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-07 21:37 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon rbowman <bowman@montana.com> - 2026-08-07 19:35 +0000
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon c186282 <c186282@nnada.net> - 2026-08-07 22:48 -0400
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon "Carlos E.R." <robin_listas@es.invalid> - 2026-08-08 09:01 +0200
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-08 12:24 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon c186282 <c186282@nnada.net> - 2026-08-08 20:47 -0400
                Pot metal - was something else The Natural Philosopher <tnp@invalid.invalid> - 2026-08-09 13:20 +0100
                Re: Pot metal - was something else "Carlos E.R." <robin_listas@es.invalid> - 2026-08-09 15:06 +0200
                Re: Pot metal - was something else The Natural Philosopher <tnp@invalid.invalid> - 2026-08-09 14:24 +0100
                Re: Pot metal - was something else Daniel James <daniel@me.invalid> - 2026-08-10 10:26 +0100
                Re: Pot metal - was something else c186282 <c186282@nnada.net> - 2026-08-09 22:48 -0400
                Re: Pot metal - was something else rbowman <bowman@montana.com> - 2026-08-09 17:46 +0000
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Daniel James <daniel@me.invalid> - 2026-08-08 13:37 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2026-08-08 17:31 +0000
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-08 18:44 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Daniel James <daniel@me.invalid> - 2026-08-10 10:43 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-10 11:46 +0100
                Names ... (Was: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon) Daniel James <daniel@me.invalid> - 2026-08-10 12:55 +0100
                Re: Names ... (Was: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon) The Natural Philosopher <tnp@invalid.invalid> - 2026-08-10 18:50 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Michael J. Mahon <mjmahon@aol.com> - 2026-08-12 04:51 +0000
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                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Marc Haber <mh+usenetspam2616@zugschl.us> - 2026-08-12 09:39 +0200
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon c186282 <c186282@nnada.net> - 2026-08-12 21:37 -0400
              Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon c186282 <c186282@nnada.net> - 2026-08-06 23:37 -0400
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon rbowman <bowman@montana.com> - 2026-08-07 18:14 +0000
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            Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon "s|b" <me@privacy.invalid> - 2026-08-06 11:03 +0200
              Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon rbowman <bowman@montana.com> - 2026-08-06 18:32 +0000
          Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon c186282 <c186282@nnada.net> - 2026-08-06 02:22 -0400
            Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon "s|b" <me@privacy.invalid> - 2026-08-06 11:12 +0200
              Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-06 12:09 +0100
            Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-06 12:57 +0100
              Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon Theo <theom+news@chiark.greenend.org.uk> - 2026-08-06 14:14 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-06 14:18 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon wmartin <wwm@wwmartin.net> - 2026-08-06 09:55 -0700
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon rbowman <bowman@montana.com> - 2026-08-06 18:48 +0000
              Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon rbowman <bowman@montana.com> - 2026-08-06 18:42 +0000
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon The Natural Philosopher <tnp@invalid.invalid> - 2026-08-06 21:43 +0100
                Re: Note : Pi 2 Zero W Now RIP-OFF Price on Amazon rbowman <bowman@montana.com> - 2026-08-07 02:26 +0000
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