Yes, I always took it that "permanent" referred to the nature of the
dissipative property of the substance not to the enduring nature of the
substance itself.
Or more succinctly: permanent while it's there.
Regards
Mike
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Peter Swanson
Sent: Wednesday, April 29, 2009 6:28 PM
To: [log in to unmask]
Subject: Re: [TN] STATIC DISSIPATIVE COATINGS
I think these things work in two ways:
1) A substance which relies on absorbed moisture to make the surface
static dissipative. Performance will therefore rely on relative
humidity. Most common types are like this.
2) A substance which has an inherently conductive ingredient, albeit a
low conductivity (e.g. ITO?). These are not humidity dependent.
I would not call the first type "permanent". The second type should work
for long periods unless other factors kick in.
For both types, permanency will also depend on adhesion to the substrate
and resistance to any abrasion or other wear & tear. If your fixture is,
say, made of ptfe and is subject to a lot of stuff rubbing against it,
then I would guess "permanent" is also unlikely.
Like all ESD measures, regular audits are best.
Regards,
Peter
--------------------------------------------------------
Peter Swanson [log in to unmask]
INTERTRONICS http://www.intertronics.co.uk
Tel: +44 1865 842842 Oxfordshire, England
INTERTRONICS is dedicated to providing quality material, consumable
and equipment solutions to the high technology, high performance
assembly industries, incorporating outstanding levels of technical
support and customer service.
Read our news! http://www.intertronics.co.uk/blog/blog.htm
INTERTRONICS is the trading name of Cygnet Electronics Ltd,
registered in England No 1835617. Registered office:
17 Station Field Industrial Estate, KIDLINGTON, Oxfordshire, OX5 1JD,
ENGLAND.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lee Whiteman
Sent: 29 April 2009 18:08
To: [log in to unmask]
Subject: [TN] STATIC DISSIPATIVE COATINGS
Has anyone ever used static dissipative coatings?
There is a coating manufacturer whose claims that their coating when
applied will make a fixture permanently static dissipative.
Any thoughts?
Thanks...
Lee Whiteman, PMP
Senior Member Engineering Staff
L-3 Communications East
Telephone: (856) 338-3508
FAX: (856) 338-2906
E-Mail: [log in to unmask]
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