Yes, 'simply'. It's not good enough, and even with the support of the UK
National Committee secretary (a graduate chemist), I could not get the
matter even discussed for IEC 60950 (it was that long ago!). Contrast
that with the (spurious and misleading) table of electrochemical
potentials, which has even been copied into IEC 62368-1. There should be
(yet another) Annex in 62368-1 and other safety standards about the
issues with named plastics (not three-letter abbreviations!). Properties
such as dielectric strength, resistance to elevated temperature,
resistance to UV, and many other properties are not widely known, but
should be.
======================================================================================
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
Rayleigh, Essex UK
I hear, and I forget. I see, and I remember. I do, and I understand.
Xunzi (340 - 245 BC)
On 2023-03-03 20:19, Douglas Powell wrote:
I work mainly in electrical safety standards and the term
polycarbonate is not commonly used. Instead they simply say polymer,
plastics, or something generic like that.
As for flammable materials, the standards I work with normally require
94 V-0 for anything in direct contact with high power or high voltage
conductors. For indirect contact, they like to see 94 V-2.
Materials, like insulating tapes and films, also have requirements
like VTM-0, VTM-1, VTM-2, or foam insulation like HF-1, HF-2, HBF. So
there is not a simple answer.
And of course, the caveat is you MUST refer to the safety
standard that is applicable to your product.
-Doug
Douglas E Powell
Laporte, Colorado USA
[email protected]
LinkedIn <https://www.linkedin.com/in/coloradocomplianceguy/>
(UTC -07:00) Mountain Time (US-MST)
On Thu, Mar 2, 2023 at 8:05 PM MIKE SHERMAN <[email protected]>
wrote:
Cecil --
Your inquiry is a bit broad, so it's hard to provide specific
answers.
If the polycarbonate parts are part of electrical equipment, you
should be able to find flammability requirements in the safety
standards used for that equipment in the intended markets.
If the polycarbonate is for use in buildings and is permanent
(e.g., windows), I would expect that there might be some guidance
in local building codes.
If the polycarbonate is used in furnishings (e.g., cashier
shields), I simply don't know. Some things (e.g., sleepware,
furniture) are regulated for flammability, but I don't know if
polycarbonate is.
Lastly, in certain high risk areas (e.g., cleanrooms) insurance
companies might have minimum flammability requirements for plastics.
So "it depends" applies here! :-)
I hope others on this forum can chip in.
Mike Sherman
Sherman PSC LLC
On 03/02/2023 8:36 AM [email protected] wrote:
Hi Folks,
I am looking for minimum requirements for flammability ratings
for Polycarbonate plastics for the different countries /regions.
Regards
Cecil
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