Cleaning RK05 packs (Was: LGP-30 Memory Drum Update)

Pete Lancashire pete at
Thu Jan 5 08:43:57 CST 2017

DEC (branded, made by Texwipe) cleaning pads contained 99% isopropyl
alcohol. The most important part was being non abrasive.
I would consider using Texwipe or other brands of non abrasive
materials before I even though about a solvent.

I remember a disk being being cleaned with common paper towels, when
that person was done you could see the scratches all over the platter.

At one time the system I ran had over 200 packs in use.

Another thing to watch out for is the two halves of some if not all
were screwed together with self tapping screws. When you take
them apart bit of plastic may come out of the holes or fall off the
insides of the screw threads. That plastic if gets between the platter
and head will not be to the heads advantage.

BTW watch out for the filter cartridge seals disintegrating,

On Thu, Jan 5, 2017 at 5:55 AM, Pete Turnbull <pete at> wrote:
> On 05/01/2017 13:22, Noel Chiappa wrote:
>>     > From: Klemens Krause
>>     > We clean our RK05 disks in a very robust way: with cheap burning
>> spirit
>>     > and paper towels. ... We rubbed away thick black traces from
>> occasional
>>     > head crashes and we never removed the oxide coating with this
>> torture.
>> First, what is 'burning spirit'? (I assume this is a straight translation
>> into English of some German term, but not knowing German... :-) After
>> poking
>> around with Google for a while (hampered no little by the fact that it's
>> the
>> name of a band, and also a term in World of Warcraft :-), it seems like it
>> might be acetone?
> I'm sure it's not ! :-)  He'll mean the sort of alcohol used in a spirit
> burner.  The UK equivalent is "methylated spirit" - primarily ethanol but
> with a (un)healthy dose of methanol to make it unfit to drink (and hence
> exempt from excise duty) plus pyridine (and small amounts of other things)
> to give it an unpleasant taste and odour, and some methyl purple dye to make
> it obvious at a glance.  Denatured alcohol, in other words. I don't think
> the German (EU) version has the dye although it does contain IPA and MEK.
> For cleaning, because of that dye, isopropyl alcohol (IPA, isopropanol) is
> often a better choice in the UK.
> In the US, "rubbing alcohol" is mostly denatured ethanol (though "isopropyl
> rubbing alcohol" is mostly IPA), but always contains other chemicals as
> well.  Either should do for cleaning a disk.
> --
> Pete
> Pete Turnbull

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