Matthew

Wherever possible try to locate connectors, switches, trimmers and other
such devices that should NOT be coated, onto one side of the assembly. In
this way they can be dip coated without any masking making this an
inexpensive operation - oh no, not costs again?

In all other coating application methods some form of masking will be
required which is time consuming and very expensive. Remember that masking
time is for the masking material, masking time AND demasking and re-work
time. This is what makes the exercise as expensive as Brian indicated.
Selective coating methods minimise masking but the capital cost is high when
compared to a dip coater and not able to handle high volumes as easily.

One other suggestion is to select connectors that will lend themselves to
easy masking. Cannot name names, but consider that coatings should be under
as well as over components, so they are designed to get into your awkward
little places!

Regards
Graham Naisbitt
[log in to unmask]
Web: www.concoat.co.uk
Concoat Ltd
Alasan House, Albany Park
CAMBERLEY GU16 7PH
Tel: +44 (0) 1276 691100
Fax: +44 (0) 1276 691227

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Matthew Lamkin
Sent: Monday, December 18, 2000 01:23
To: [log in to unmask]
Subject: [TN] Conformal Coating - Design Guidelines?


Are there any design guidelines for PCB designers, to help design a board
that is suitable for
use within a conformal coating machine?

Matthew Lamkin.

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