In message <C2866F9FC4CB034EB51A633DF16859860CEA7518@ssbarcelone>, dated
Tue, 26 Mar 2013, "Gelfand, David" <[email protected]>
writes:
Is there a product I can buy at the hardware store that is roughly
equivalent to the hexane specified in durability test:
" The petroleum spirit to be used for the test is aliphatic solvent
hexane having a maximum aromatics content of 0,1 % by volume, a
kauributenol value of 29, an initial boiling point of approximately 65
°C, a dry point of approximately 69 °C and a mass per unit volume of
approximately 0,7 kg/l."
It's actually about 20% nonsense. I'll explain. Long years ago, I
objected to the bare phrase 'petroleum spirit' in IEC 65 (as it was
then, because people were using all sorts of jungle juice, some of which
dissolved the moulded enclosures. I suggested defining the reagent as
'n-hexane'. The convener at that time, not being a chemist, asked a
company chemist what 'n-hexane' was, and received that complicated text,
presumably extracted from a supplier's specification.
Later, I raised the issue again, following complaints that reagent to
that specification was no longer available except as a 'to order'
product, and that text was meant to be replaced by a simpler one, but I
see in current (and even future) editions (of IEC/EN 60065, I haven't
looked at IEC/EN 60950-1 or 62389-1 in case they are even more
disappointing), the text is in the wrong order, or the GOOD information
is relegated to a Note:
NOTE The designation “n-hexane” is chemical nomenclature for a
"normal" or straight chain hydrocarbon. This petroleum spirit may
further be identified as a certified ACS (American Chemical Society)
reagent grade hexane 1042 (CAS# 110-54-3).
You should be able to buy that quite easily.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
SHOCK HORROR! Dinosaur-like DNA found in chicken and turkey meals
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
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