John- All that "petroleum spirit" technical jargon translates into good old kerosene. That's the solvent the UL lab techs use to conduct the permanence of marking test for UL1950 (along with a separate test run using water as the solvent.)
I believe, however, that the original thread of this message dealt with a non-ITE standard, such as for laboratory or medical equipment. In those environments, one might commonly use readily available "rubbing alcohol" to clean an instrument, therefore the need to test permanence with isopropyl alcohol. -- DWIGHT HUNNICUTT Sr. Compliance Engineer VINA Technologies,Inc. Crabb, John wrote: > > The requirements in 1.7.15 of UL 1950 are : - > Compliance is checked by inspection and by rubbing the marking by hand for > 15 s with a piece of cloth soaked with water and again for 15 s with a piece > of cloth soaked with petroleum spirit. After this test, the marking shall be > legible; it shall not be possible to remove marking plates easily and they > shall show no curling. > The petroleum spirit to be used for the test is aliphatic solvent hexane > having a maximum aromatics content of 0.1% by volume, a kauri-butanol value > of 29, an initial boiling point of approximately 65EC, a dry point of > approximately 69EC and a mass per unit volume of approximately 0.7 kg/l. > > My recollection is that the sentence beginning "the petroleum spirit" was > added to CLARIFY > exactly what should be used. > > It has been suggested to me that doing the test EXACTLY as specified is less > severe > than just rubbing with petrol (gas to you). i.e. rubbing with water leaves a > film of water, > followed by rubbing with petrol. > > We use a UL Recognized Printing Materials system (PGJI2), where the > combination of > label stock, ink ribbon, and printer gives you a label which satisfies UL > requirements. > We use a system from Donprint, which also is CSA Certified, and we have > NEVER had > UL or CSA carry out any tests. > > As an aside, one of the advantages of buying UL 1950 on disc is that you > could copy > the above extract and insert it in an e-mail such as this, rather than > typing it out. > > John Crabb, Product Safety > NCR Financial Solutions Group Ltd, Dundee, Scotland.
