What if anything are laboratories doing to "calibrate" chemical solutions?
Seems to me that as an ISO Guide 25 laboratory, an analysis of the batch
of the solution to nationally tracible standards by an ISO Guide 25
laboratory is required.
What are other laboratories doing to calibrate chemical solutions?
Jon D. Curtis, PE
Curtis-Straus LLC [email protected]
Laboratory for EMC, Safety, NEBS, SEMI-S2 and Telecom
527 Great Road voice (978) 486-8880
Littleton, MA 01460 fax (978) 486-8828
http://www.curtis-straus.com
On Fri, 10 Jul 1998, Chris Dupres wrote:
> Hi Ned.
>
> You wrote:
> <I need some help to solve a difference of opinion. A number of
> standards require isopropyl alcohol for durability of marking test.
> e.g. IEC 1010-1, Clause 5.3 and IEC 601-1, Clause 6.1.z.
>
> The difference in opinion is in the concentration. The standards just
> state "isopropyl alcohol". Some say 70% others say 100%. What are
> other people using? >
>
> I use a material labelled 'Isopropyl Alcohol' for the rub test. That's
> what it says on the tin, and I can only assume that it is 100%. I am sure
> that it is 100% because spills evaporate very quickly and leave no water
> behind, I'm sure that if it was diluted the water would remain long after
> the IPA had gone.
>
> Does that make sense?.
>
> Chris Dupres
> Surrey, UK.
>
