I am not sure what the surface energy is referring to, but what is
important to most users if the Dielectric Withstanding Voltage.
IPC-SM-840C requires a 500 VDC minimum DWV performance on the finished
product.  Based on your specific materials performance characteristics,
the minimum required thickness can be determined.  

IPC-SM-840 is a basic guideline for the soldermask suppliers and some
basic testing guidelines for the user.  We also use Telcordia (BellCore)
TA-NWT-000078 which has some specific qualification and testing
requirements for SIR, etc. 

Jeffrey Bush
Director, Quality Assurance and Technical Support
VERMONT CIRCUITS INCORPORATED 
           76 Technology Drive - POB 1890 
              Brattleboro, Vermont 05302
                Voice - 802.257.4571 ext 37 
                    Fax - 802.257.0011
                       <http://www.vtcircuits.com/> 
                           

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Leigh Jansen
Sent: Monday, February 13, 2006 6:59 AM
To: [log in to unmask]
Subject: [TN] SOLDER RESIST - PRODUCTION STANDARDS

Dear all,
I would be very keen to find out from both board manufacturer and end
user
perspectives what standards (national/international or otherwise) that
you
follow to control the quality of solder resist coated boards.
IPC SM840 relates to solder resists but would not look at the surface
energy
of the resist coating ? Does anyone specify a minimum or maximum value
or
range for QA purposes ?

Thanks,

Leigh Jansen
Development Manager

Concoat Ltd
Alasan House, Albany Park, Frimley Road, Camberley, Surrey  GU16 7PH
Tel:  01276 691 100  Mobile 07919 470 959

Providing Reliability in Electronics
A British Manufacturer : Part of Chase Specialty Coatings

www.conformalcoating.com <http://www.conformalcoating.com/>
www.concoat.co.uk <http://www.concoat.co.uk/>
 www.chasespecialtycoatings.com/info.html



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