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.
