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From: "nightjar" nightjar on 1 Apr 2007 21:17

"Alex Coleman" <no(a)no-email.com> wrote in message
news:Xns9905BD1A2FF9471F3M4(a)127.0.0.1...
> On my rather old tube of 'regular' Araldite it says it is ok for metal.
>
> If this is so then why would I ever use one of those 2-part adhesives
> sold specially for metal? I mean the sort of thing that is usually
> coloured grey and can often be bought in car accessory shops?
>
> I need to glue an aluminium ring (about 1.5 inches diameter and about
> 4mm thick) to a plastic base. There will be some light to moderate
> stressing of this arrangement when it is in use.

Araldite is not recommended for use where it may be subjected to a peel
stress.

> I figured the Araldite was just fine for the plastic but what about the
> metal?

Aluminium to aluminium is the base against which they compare all other
bonds in their data sheets.

Colin Bignell


From: The Natural Philosopher on 2 Apr 2007 05:04
Alex Coleman wrote:
> On 01 Apr 2007, OG <owen(a)gwynnefamily.org.uk> wrote:
>
>> "Derek Geldard" <dgg(a)miniac.demon.co.uk> wrote in message
>> news:c0sv03tf53vnv5ao6s0976spmv1deh4t9m(a)4ax.com...
>>> On Sun, 01 Apr 2007 18:35:22 +0100, Alex Coleman <no(a)no-email.com>
>>> wrote:
>>>
>>>> On my rather old tube of 'regular' Araldite it says it is ok for
>>>> metal.
>>>>
>>> It is OK for metal.
>>>
>>>> If this is so then why would I ever use one of those 2-part
>>>> adhesives sold specially for metal? I mean the sort of thing that
>>>> is usually coloured grey and can often be bought in car accessory
>>>> shops?
>>> Sundry other reasons. If it's what I'm thinking about they contain
>>> a lot of inert filler, it helps filling holes and gaps. The grey
>>> colour is to convince the proles they can fix holes in grey metal
>>> with it.
>>>
>>>> I need to glue an aluminium ring (about 1.5 inches diameter and
>>>> about 4mm thick) to a plastic base. There will be some light to
>>>> moderate stressing of this arrangement when it is in use.
>>>>
>>>> I figured the Araldite was just fine for the plastic but what
>>>> about the metal?
>>> It's fine on aluminium per-se.
>>>
>>> Less so on plastic, and it depends which plastic.
>>>
>>> Set araldite is brittle, if the whole assembly will deflect under
>>> load the joint may break up.
>> I use a little less hardener if I think a bit of 'give' is needed.
>>
>
>
> Doesn't using less hardener with Araldite slow down the rate of
> curing rather than give an incomplete (and therefore more flexible)
> cure?

Actually it isn't hardener. Its two parts of the glue which have to be
mixed thoroughly and in equal proportions. All that less of one part
does is leave pockets of the other unset.
From: The Natural Philosopher on 2 Apr 2007 05:03
Alex Coleman wrote:
> On my rather old tube of 'regular' Araldite it says it is ok for metal.
>
> If this is so then why would I ever use one of those 2-part adhesives
> sold specially for metal? I mean the sort of thing that is usually
> coloured grey and can often be bought in car accessory shops?

cos they are better
>
> I need to glue an aluminium ring (about 1.5 inches diameter and about
> 4mm thick) to a plastic base. There will be some light to moderate
> stressing of this arrangement when it is in use.
>
> I figured the Araldite was just fine for the plastic but what about the
> metal?

Actaully, is not brimliant for wither. get some 'liquid metal'. That
will work best.
From: The Natural Philosopher on 2 Apr 2007 05:05
Duncan Wood wrote:
> On Sun, 01 Apr 2007 20:42:23 +0100, Alex Coleman <no(a)no-email.com> wrote:
>
>> On 01 Apr 2007, OG <owen(a)gwynnefamily.org.uk> wrote:
>>
>>>
>>> "Derek Geldard" <dgg(a)miniac.demon.co.uk> wrote in message
>>> news:c0sv03tf53vnv5ao6s0976spmv1deh4t9m(a)4ax.com...
>>>> On Sun, 01 Apr 2007 18:35:22 +0100, Alex Coleman <no(a)no-email.com>
>>>> wrote:
>>>>
>>>>> On my rather old tube of 'regular' Araldite it says it is ok for
>>>>> metal.
>>>>>
>>>>
>>>> It is OK for metal.
>>>>
>>>>> If this is so then why would I ever use one of those 2-part
>>>>> adhesives sold specially for metal? I mean the sort of thing that
>>>>> is usually coloured grey and can often be bought in car accessory
>>>>> shops?
>>>>
>>>> Sundry other reasons. If it's what I'm thinking about they contain
>>>> a lot of inert filler, it helps filling holes and gaps. The grey
>>>> colour is to convince the proles they can fix holes in grey metal
>>>> with it.
>>>>
>>>>> I need to glue an aluminium ring (about 1.5 inches diameter and
>>>>> about 4mm thick) to a plastic base. There will be some light to
>>>>> moderate stressing of this arrangement when it is in use.
>>>>>
>>>>> I figured the Araldite was just fine for the plastic but what
>>>>> about the metal?
>>>>
>>>> It's fine on aluminium per-se.
>>>>
>>>> Less so on plastic, and it depends which plastic.
>>>>
>>>> Set araldite is brittle, if the whole assembly will deflect under
>>>> load the joint may break up.
>>>
>>> I use a little less hardener if I think a bit of 'give' is needed.
>>>
>>
>>
>> Doesn't using less hardener with Araldite slow down the rate of
>> curing rather than give an incomplete (and therefore more flexible)
>> cure?
>
> Yes.
No.
From: Timothy Murphy on 2 Apr 2007 06:37
I haven't been following this discussion,
but re the title, wasn't Araldite originally developed
for sticking together small jet planes?

IIRC, it was developed at Duxford, south of Cambridge (UK),
which I think was an air base at the time,
perhaps in the 1950s?


--
Timothy Murphy
e-mail (<80k only): tim /at/ birdsnest.maths.tcd.ie
tel: +353-86-2336090, +353-1-2842366
s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland
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