Hi, I don't think it would matter if you did the water first or the petroleum spirit.
Note: for petroleum spirit we use n-Hexane 95+%, not kerosene or gas. Ned Devine Entela, Inc. Program Manager III Toll Free: 1 800 888 3787 Ext. 671 Direct: 1 616 248 9671 Fax: 1 616 248 0591 e-mail: [email protected] > ---------- > From: Crabb, John[SMTP:[email protected]] > Reply To: Crabb, John > Sent: Tuesday, July 14, 1998 6:37 AM > To: '[email protected]'; [email protected]; > [email protected]; [email protected] > Subject: RE: RE: isopropyl alcohol > > 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. >
