STANDARDS
An overview of:
IEC : International Electro-technical Commission
ISO : International Organization for Standardization
UL : Underwriters Laboratories
ATSM : American Society for Testing & Materials
IPC : Institute for Interconnecting & Packaging Electronic Circuits
MoD / DoD : Defence Standards.
Founded in 1906 with British scientist Lord Kelvin as its
first president.
Prepares and publishes international standards for all
electrical, electronic and related technologies.
The IEC embraces all electrotechnologies including
electronics, magnetics and electromagnetics.
electroacoustics, multimedia, telecommunication.
energy production and distribution.
terminology and symbols.
ISO was born from the union of two organizations in October
1946.
The ISA (International Federation of the National
Standardizing Associations), established in New York in
1926.
The UNSCC (United Nations Standards Coordinating
Committee), established in 1944.
Delegates from 25 countries, meet at the Institute of Civil
Engineers in London to create ISO.
A new international organization.
"to facilitate the international coordination and unification of
industrial standards"
ISO's work program ranges from standards for traditional
activities, such as agriculture and construction.
Mechanical engineering, manufacturing and distribution.
Transport, medical devices, information and
communication technologies.
Standards for good management practice and for services.
Such as
ISO9001 and ISO14001
Underwriters Laboratories® is an independent product safety
certification organization that has been testing products and
writing standards for safety since 1894.
1916 First International Office opens in London.
UL Mission Statement
To promote safe living and working environments by the
application of safety science and hazard-based safety
engineering.
AND MAKE MONEY !!
ASTM was founded in 1898 by Charles Dudley based
around the need for standards in the railroad industry
for steel.
In 1900 it expanded its interests into cement.
Today they cover such diverse industries as safety in
recreational aviation, to fiber optic cable installations
in underground utilities, to homeland security and
electrical equipment.
IPC was founded in 1957 as the Institute for Printed
Circuits. As more electronics assembly companies
became involved with the association, the name was
changed to the Institute for Interconnecting and
Packaging Electronic Circuits, and finally abbreviated
to IPC.
IPC represents all facets of the industry, including
design, printed circuit board manufacturing and
electronics assembly
Both the British MoD and the American DoD have in the
past issued procurement specifications relating to
Conformal Coatings.
The trend in recent years on both sides of the big pond
is for defence procurement to use national and
international industrial standards.
So, we have all of theses standards
How do we simulate or test for failure ?
There are many individual company standards but
most relate back to international standards.
Prefix
Name
Website
UL
Underwriters Laboratories Inc
www.ul.com
IEC
International Electrical Commission
www.iec.ch
IPC
The Institute for Interconnecting and Packaging
Electronic circuits
www.ipc.org
MIL
US department of defence
DEF STAN
UK Ministry of Defence
www.dstan.mod.uk
BSI
British Standards Institute
www.bsi-global.com
BSI EN
British standards Institute (European)
www.bsi-global.com
ASTM
American Society for Testing and Materials
www.astm.org
ISO
International organisation for standardisation
www.iso.org
DIN
German institute for standardisation
www.din.de
Standards
Some standards are specific to a property for example
adhesion or flammability.
Others include a range of properties, to test how well a
conformal coating performs overall.
The next few slides give a general comparison of 4 such
standards
MIL-I46058C
Visual examination

Thickness of film

IPC-CC-830 IEC 61086



Flexibility




Dissipation factor and
permittivity
Dielectric withstanding voltage


Tackiness
Q (resonance)

DEF STAN
59/47



Breakdown voltage
Insulation resistance



Flammability




MIL-I46058C
IPC-CC830
IEC 61086
DEF STAN
59/47

Thermal cycling

Thermal aging


Salt mist

Insulation resistance after
aging test

Flexibility after aging test

High altitude and temperature

Thermal shock



Insulation resistance after
rapid temperature change
Flexibility after rapid
temperature change



MIL-I46058C
DEF STAN
59/47

Humidity aging
Moisture resistance
IPC-CC-830 IEC 61086




Resistance to damp heat
Hydrolytic stability

Mould growth/fungal
resistance




Shelf life





Emission of volatiles
Resistance to solvent cleaning
liquid
Coating removal by solvent
Resistance to freezer sprays






Standards
These standards should be used as guidance only and
the coating choice and tests should be made based on
the specific application requirements.
e.g.
LED display – Salt fog, High moisture 85°C/85RH
Avionics – Solvent resist, Outgassing, Moisture,
Damp heat, thermal shock, Flammability…
damp heat, cyclic
6 cycles
BMW GS 95003-4
thermal cycling test,
25 cycles
TU –40 °C, TO 130 °C *)
BMW GS 95003-4
corrosive gas test
21 days
BMW GS 95003-4
damp heat, constant
21 days
BMW GS 95003-4
25 thermal cycles
BMW GS 95003-4
salt spray test
BMW GS 95003-4
Coating adhesion test
BMW GS 95011-3
Example: Customer selecting
individual tests from existing
standards.
13,0
60
12,0
50
10,0
Automotive approval tests
Environmental stress (serial)
40
30
9,0
20
8,0
10
7,0
0
1000
2000
3000
4000
5000
6000
7000
8000
0
9000
t [min]
Damp heat cycle - good protection performance.
Total time 6 days
T [°C]
R [Log Ohm]
11,0
Typical failure
on test board.
200 µm
So, what happens in practice ?
People still ask for coatings to MIL-I-46058c
You can still list against this standard.
UL is becoming more wide spread.
IEC60664-3 is being called up for harsh
environments.
IPC-CC-830 & IEC601086 will sometimes be
specified.
QPL Listing
Qualified Products List
There are only two standards that
provide QPL’s
MIL-I-46058c & UL
All other standards you test against and
then state “meets” the standard.
QPL matters.
Because some competitors will claim they meet QPL
standards without being listed
HumiSeal have a range of products listed to both
MIL-I-46058c and UL
We continue to test and list to these standards.
HumiSeal • 295 University Avenue
•Westwood • MA 02090 • USA
Tel: +1 781 8332
HumiSeal Europe • 505 Eskdale Road • Winnersh
Wokingham • Berkshire • RG41 5TU • United
Kingdom
Tel: +44 (0)1189 442 333
www.humiseal.com