Grace,
That same site has 0.020" rigid vinyl which would work fine. I doubt an
auditor would pick on a 2% difference in thickness.
Best of luck,
Brent DeWitt
-----Original Message-----
From: Grace Lin
Sent: Apr 7, 2009 8:37 AM
To: [email protected]
Subject: Re: [PSES] 10cm above GRP requirement for 61000-4-6
I did a quick search (such as from
http://www.usplastic.com/catalog/product.asp?catalog%5Fname=USPlastic&category%5Fname=68&product%5Fid=10718)
and couldn't find the 0.5mm thickness Lexan sheet, nor polycarbonate sheet.
Home Deport sells Plexiglass, but not the thickness we look for.
Grace
On 4/6/09, ce-test, qualified testing bv - Gert Gremmen
<[email protected]> wrote:
I use Lexan, otherwise named as “ plastic glass” for caravans
etc.
good insulation properties (400V/mil) , 0.50 mm is available
easily at most plastic distributors.
Gert Gremmen
Ce-test, qualified testing bv
Van: [email protected] [mailto:[email protected]] Namens Grace
Lin
Verzonden: maandag 6 april 2009 15:03
Aan: [email protected]
Onderwerp: Re: 10cm above GRP requirement for 61000-4-6
Bob,
Thank you for sharing your auditing experience with us.
Since you pointed out the thickness of the ESD insulating mat.
I had mine measured. It is a little off the spec of 0.5mm. Does any member
have suggestion of vendors for the 0.5mm (about 0.02 inches) insulation sheet
in low quantity such as less than 10 (in the US is better)?
Making a 10cm woodstand within 10% tolerance is much easier
than the same tolerance for 0.5mm. In the US, a piece of 2"x4" lumber (the
real dimension of 4" is about 3.5" or 8.89cm) plus a piece of 1/2" (1.27cm)
thickness plywood will do the job. In order to obtain a smooth surface (used a
router) from the 2"x4" lumber to glue to the plywood, I used 3/4" plywood to
make up the dimension. The finish is three coatings of stain. The tolerance
is less than 1mm (1%).
Best regards,
Grace
On 4/4/09, Bob Richards <[email protected]> wrote:
Well, the audit went well. The auditor had no problem with the 10cm spacers or
the 80cm tables. However, he did have a bit of a problem with our ESD
insulating mat, which he measured to be 0.45mm instead of the required 0.5mm.
However, I mentioned the fact that the 61000-4-4 EFT standard is the only
standard in the family that lists a tolerance, and it was +/- 10% for the 10cm
spacing. So, he accepted the +/- 10%.
I never figured my original question would spawn so much response. Thanks to
everyone that participated. :-)
Bob Richards, NCT.
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