OK sorry to teach you how to suck eggs.
If you had the actual viscosity of each batch as supplied you wouldn't need
to (re)measure it to determine higher and lower limits for good results.
Most suppliers (in my experience) will accommodate a high end (say) request
within standard range product or allow you to specify a tighter range than
their normal published limits.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan TEMPEA
Sent: Friday, October 10, 2014 1:35 PM
To: [log in to unmask]
Subject: Re: [TN] Viscometer
Mike,
I fully understand the futile debate if I wanted to validate the supplier's
measurements.
What about using the viscometer for lot to lot consistency assessment, i.e.
I set the baseline to a known good lot and then simply measure the lot to
lot variation? Is a viscometer the proper tool for this?
Thanks,
Ioan Tempea, P. Eng.
Manufacturing Engineer, Satellite Systems
MacDonald, Dettwiler and Associates Corporation, 21025 Trans-Canada Highway,
Ste-Anne-de-Bellevue, QC, Canada H9X 3R2
Tel: +1-514-457-2150 x3556
www.mdacorporation.com
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-----Message d'origine-----
De : Mike Fenner [mailto:[log in to unmask]]
Envoyé : Friday, October 10, 2014 8:27 AM
À : 'TechNet E-Mail Forum'; Ioan TEMPEA
Objet : RE: [TN] Viscometer
Testing for what?
If you are considering it for goods inwards testing or verifying aged
material, then I would urge you to consider other ways. (Print test or
extrusion rate or similar.) Unless you can exactly duplicate supplier test
conditions (and even then) you are probably in for a world of pain. It is
likely your numbers will differ from theirs. This will give you endless
debates back and forth on the meaning of the numbers and possibly needless
rejections and resulting "discussions".
If you do go ahead with that then as other 'netters have said you will need
the same kit (implicit in above) as your material vendors. Depending on the
other materials you wish to investigate you may require more than one type
of viscometer. Which ever way you go I would suggest you use your number as
an index only not an absolute measurement. You will also need to ask for
actual viscosity of each batch to be supplied on C of C (if not now) as some
people certify product to be as specified wchich will only mean within
range, to get any meaningful data.
Having said that, if you did had the actual viscoity as supplied you would
not need to do your own as you would have a measurement you could rely on
and do SPC like things with it.
If you just want to explore rheology the classic Brookfield is really an
obsolete method as it doesn't really measure rheology. Those people who give
Brookfield data do so only for historical or continuity reasons. There are
much better systems, which are faster and less condition of test dependent.
The other problem you could have is sample size, some systems can require a
test sample larger than you might have [or can afford if looking at
conductives.]
Hope this helps.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ioan TEMPEA
Sent: Thursday, October 09, 2014 1:08 PM
To: [log in to unmask]
Subject: [TN] Viscometer
Dear Technos,
I need to buy a viscometer, what are your suggestions?
The main usage will be testing conductive epoxies, but might be used for
other materials too.
Thanks,
Ioan Tempea, P. Eng.
Manufacturing Engineer, Satellite Systems
[cid:[log in to unmask]]
MacDonald, Dettwiler and Associates Corporation, 21025 Trans-Canada Highway,
Ste-Anne-de-Bellevue, QC, Canada H9X 3R2
Tel: +1-514-457-2150 x3556
www.mdacorporation.com<http://www.mdacorporation.com/>
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intended recipient(s) and may contain legally privileged, proprietary and/or
confidential information. Any use, disclosure, dissemination, distribution
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been specifically authorized by the sender is strictly prohibited. If you
are not the intended recipient, please immediately notify the sender by
reply e-mail and permanently delete all copies and attachments. This email
is for informational purposes only and shall not be interpreted to authorize
or conclude a binding agreement between MDA and any other party unless this
email contains or is accompanied by an express written confirmation of MDA's
intention to enter into a binding agreement, such confirmation shall only be
provided by an authorized representative of MDA.
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