Hi, Typically we require a Certificate of Conformance traceable to NIST with the shipments. If a CoC is not available, then we run a chemical analysis. The chemical then goes into our "calibration" data base and is marked with an asset number and if necessary, shelf life.
> ---------- > From: Jon D Curtis[SMTP:[email protected]] > Sent: Friday, July 10, 1998 10:37 AM > To: Chris Dupres > Cc: Ned Devine; emc-pstc > Subject: Re: isopropyl alcohol > > 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. > > >
