The plain language requirements for conformal coating are:
Coating shall be where it is required to be, and there shall not be any coating where it isn't required.
J-STD-001E Clause 10.1.1 Application Coating shall [D1D2D3] be applied in a continuous manner TO ALL AREAS DESIGNATED FOR COVERAGE ON
THE ASSEMBLY DRAWING/DOCUMENTATION.
IPC-A-610E Clause 10.8.2 Acceptable - Class 1,2,3 Coating only in those areas WHERE COATING IS REQUIRED. Defect - Class 1,2,3 Coating is on areas required to be free of coating, e.g., mating surfaces, adjustable hardware, wicking into connector housings, etc.
If the drawings/documentation don't require coating J-STD-001 and IPC-A-610 don't separately cause a requirement for coating.
Jack Crawford
Certification and Assembly Technology
IPC - Association Connecting Electronic Industries®
3000 Lakeside Dr. Suite 309S
Bannockburn, IL 60015
847-597-2893
Fax 847-615-5693
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www.ipc.org
www.ipc.org/status www.ipc.org/certification www.ipc.org/downloads
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Richard Kraszewski
Sent: Sunday, March 16, 2014 5:44 PM
To: Technet
Subject: Re: [TN] Confusion about conformal coating area
You and your organization are not the only ones being driven crazy by this these specifications. Current J-Std-001 leads you to believe all must be coated. The A610 seems to make better use of the acronym AABUS (as agreed between user and supplier). In my experience, you can sometimes explain and convince the customer that there is little value in coating the side of molded components. Only try electrical conductors.
More often than not, this is easier done at the start of a program rather than after the fact.
Rich Kraszewski
PLEXUS
(920)969-6075
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Çetin Yegin
Sent: Friday, March 14, 2014 3:02 AM
To: [log in to unmask]
Subject: [TN] Confusion about conformal coating area
Dear All,
We have a confusion about conformal coating area. Our quality department rejects some boards because edges of some high components were not coated. These edges are non-conductive and I think there is no need to coat non-conductive areas. IPC-A-610 10.5.2 says that "Conformal coatings should be transparent, uniform in color and consistency and uniform cover the board and components".
1. Does it mean we have to coat all areas unless specified in design document?
2. Is there any requirement to coat non-conductive areas?
3. Do we have to coat non-conductive areas of components?
Thanks.
Best Regards
Çetin YEĞİN
Senior Engineer
ASELSAN A.S. \ ASELSAN INC.
Microelectronics, Guidance and Electro-Optics Division (MGEO) Çankırı Yolu, 7. km, 06750 AKYURT, ANKARA, TURKEY
Phone: +90 (312) 847 53 00 Ext:4071
Fax: +90 (312) 847 53 20
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