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From: Alex Coleman on 1 Apr 2007 13:35
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.

I figured the Araldite was just fine for the plastic but what about the
metal?
From: Derek Geldard on 1 Apr 2007 14:07
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.

You may need to look further.

DG

From: OG on 1 Apr 2007 15:07

"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.


From: Alex Coleman on 1 Apr 2007 15:42
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?
From: Duncan Wood on 1 Apr 2007 15:56
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.
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