If sold as "Isopropyl alcohol" it should be 97 to 99% pure, if sold as "Isopropyl alcohol 70%" it will be 30% water. The latter is used as a disinfectant scrub.
It is hydroscopic so will never, under normal circumstances, be 100%. Chris > -----Original Message----- > From: Chris Dupres [SMTP:[email protected]] > Sent: Friday, July 10, 1998 5:57 AM > To: Ned Devine > Cc: emc-pstc > Subject: isopropyl alcohol > > 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.
