Urethane Conformal Coating
4223 Technical Data Sheet
4223-Liquid
Conformal Coating Description
Our 4223 Urethane Conformal Coating offers a highly chemical-resistant finish that meets UL standards
for indoor conformal coatings. This one part coating is easy to use: it does not require special or costly
equipment to apply. It is ideal for extremely corrosive environments.
The 4223 polyurethane protects electric circuits against corrosive chemicals, moisture, dirt, dust, thermal
shocks, and scratches. This avoids corrosion and physical damages to electric components. It also
insulates against high-voltage arcing, shorts, and static discharges.
Polyurethane Applications & Usages
The 4223 polyurethane improves reliability, operational range, and lengthens the life of electrical and
electronic parts. You will find it mainly in corrosive environments such as farming, mining, smelting, oil
exploration, and marine industries. As well, it applies to any other areas where corrosion must be avoided.
Common urethane conformal coatings industrial uses are with electric generators, motors, transformers,
relays, and equipment controllers. Commercial applications span fire alarms, sensors, automotive
electronics, electrical connectors, and porcelains.
For example, poultry or hog farmers can use the 4223 Conformal Coating to protect sensors and
electronics in modern farms against the atmospheric ammonia, urea, hydrogen sulfide, and humidity
generated by animal waste and fertilizers.
Polyurethane Benefits
Excellent Chemical
and
Abrasion Resistance
Meets indoor UL
conformal coating specifications for a 2 mil thick coat on a 0.8 mm, FR-4
laminate
Flammability:
meets UL 94V-1
Class F Temperature Rating:
160 °C [320 °F]
Transparent Appearance:
the clear amber coat lets you see problems if they occur
Protects electronics from
chemical corrosion, oil, moisture, fungus, and static discharges
Good Fungus Resistance
Easy to inspect:
fluoresces under UV light
Curing & Work Schedule*
Properties
Value
Set to Touch
30 minutes
Tack Free
60 minutes
Full Cure (at room temp.)
24 hours
Full Cure (at 65 °C [149 °F]) 60 minutes
*Cure times assume a minimum thickness
of 1 mil and standard conditions.
Service Ranges
Value
-40 to +160 °C
[-85 to +320 °F]
Max coverage per 1L**
<127 000 cm
2
for 25
m
[1 mil]
[<136 ft
2
]
**Estimated based on ideal values. Actual value
will be somewhat less than quoted.
Properties
Service Temperature
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Urethane Conformal Coating
4223 Technical Data Sheet
4223-Liquid
Chemical Components
Name
Polyurethane Resin
Xylene
Ethyl Benzene
CAS Number
proprietary
1330-20-7
100-41-4
Properties of Cured 4223
Physical Properties
Color
Solderability
Abrasion Resistance
Fungus Resistance
Flexibility
Flammability
Electric Properties
Dielectric Strength (dry)
(wet)
Chemical Resistance
Water
Acid (10% sulfuric acid)
Alkali (1% sodium hydroxide)
Salt water
Oil
Copper corrosion
Method
Visual
—
—
MIL-V-173C-2
—
UL 94
Method
ASTM D 115
ASTM D 115
Method
—
—
—
—
ASTM D-115
—
Value
Clear Amber
Yes
Superior
Meets
Good
Meets 94V-1
Value
1,800 volts/mil
1,200 volts/mil
Value
Good
Excellent
Excellent
Excellent
Passed
None
Properties of Uncured 4223
Physical Property
Odor
Viscosity at 25 °C [77 °F]
Specific gravity at 21 °C [77 °F]
Flash Point
Boiling Point
Solids Content (w/w)
Dry Film Thickness per dip
Dry Film Thickness per dip
Method
—
Brookfield ASTM D 2196
ASTM D 287
ASTM D 3278
Value
Aromatic
130 to 270 cP
0.94
27 °C [81°F]
Not established
32%
~25 to 38
m
[~1 to 1.5 mil
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Urethane Conformal Coating
4223 Technical Data Sheet
4223-Liquid
Compatibility
The 4223 urethane coating is compatible with most materials found on printed circuit assemblies;
however, in an uncured state it is not compatible with contaminants like water, oil, and greasy flux
residues. Therefore, it is extremely important to clean the printed circuit assembly thoroughly with a
suitable electronic cleaner before applying the coating.
The chosen electronic cleaner should remove moisture, wax, greases, oils, and all other contaminants that
are known to cause defects in this type of conformal coating. (See recommended cleaners in the next
section.)
Packaging and Supporting Products
Product Availability
Cat. No. 4223-55ML (2 oz) / 4223-1L (950 ml (1 quart)) / 4223-4L (1 gal) / 4223-20L (5 gal)
Liquid
Thinners & Conformal Coating Removers
Cat. No. 435-55ML (2 oz), 435-1L (33 oz), 435-4L (1 gal) Conformal Coating Thinner
Electronic Cleaners
Cat. No. 4050A-340G, 4050-1L, 4050-4L, 4050-20L Safety Wash Electronics Cleaner
Cat. No. 406B-450G Superwash Cleaner Degreaser
Cat. No. 824 Isopropyl Alcohol
Health, Safety, and Environmental Awareness
Please see the 4223
Material Safety Data Sheet
(MSDS) for more details on transportation, storage,
handling and other security guidelines.
Environmental Impact:
The 4223 formulation is designed for industrial use. It has a VOC of 569 g/L.
Avoid runoff into storm and sewer drains.
HMIS RATING
HEALTH:
FLAMMABILITY:
PHYSICAL HAZARD:
PERSONAL PROTECTION:
NFPA CODES
2
3
0
1
3
2
0
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Urethane Conformal Coating
4223 Technical Data Sheet
4223-Liquid
Health and Safety:
The coating solvents are flammable and should be kept away from flames and other
ignition sources. As with most paint materials, avoid breathing in fumes or direct contact with the
material. Toxic solvents therein can cause irritation and other symptoms like headaches, pain, as well as
having long term exposure effects.
Wear safety glasses and disposable viton gloves. Teflon gloves may be used for handling periods of less
than 4 hours. Wash hands thoroughly after use. Use in the open air, in fume hoods, or in area with
engineered ventilation controls to keep airborne levels below allowable thresholds. For short or long term
(8 hour workday and 40 hour workweek) at levels of exposures exceeding 100 ppm xylene or 100 ppm
ethyl benzene, use NIOSH approved respirator with organic vapor cartridges rated for this order of
concentrations.
The cured coating presents no known hazard.
Spray Gun Application Instructions
Follow the procedure below for best results. For automated spray booths, follow the instrument
manufacturers guidelines.
To apply the required thickness by weight
1. Mix thoroughly, and spray a test pattern.
This step ensures good flow quality and helps establish appropriate distance to avoid runs.
2. At a distance of 20 to 25 cm (8 to 10 inches), hold the gun at around 45°, and spray a thin and
even coat onto the horizontal board. For best results, use spray-and-release strokes with an even
motion to avoid excess paint in one spot.
3. Before the next coat, rotate the board 90° to ensure good coverage.
4. Wait at least 30 minutes, and spray another coat. The delay avoids
trapping solvent between coats.
5. Apply other coats until desired thickness is achieved. (Go to Step 3)
6. Let dry for 60 minutes at room temperature.
To cure the conformal coating
Full cure can be achieved in less than 60 minutes by using an infrared lamp or in convection oven at 65 °C
[149 °F]. At room temperature, full cure takes about 24 hours.
The procedure above is based on a minimum thickness of 25
m
(1 mil) conformal coating. After full cure,
measure the actual conformal coating thickness to ensure it meets the applications requirements.
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Urethane Conformal Coating
4223 Technical Data Sheet
4223-Liquid
Technical Support
Contact us regarding any questions, improvement suggestions, or problems with this product. Application
notes, instructions, and FAQs are located at
www.mgchemicals.com.
Email:
support@mgchemicals.com
Phone: 1-800-201-8822 Ext. 128 (Canada, Mexico & USA)
1-604-888-3084 Ext. 128 (International)
Fax: 1-604-888-7754 or 1-800-708-9888
Mailing address:
Manufacturing & Support
1210 Corporate Drive
Burlington, Ontario, Canada
L7L 5R6
Head Office
9347–193rd Street
Surrey, British Columbia, Canada
V4N 4E7
Disclaimer
This information is believed to be accurate. It is intended for professional end users having the skills to
evaluate and use the data properly. M.G. Chemicals Ltd. does not guarantee the accuracy of the data and
assumes no liability in connection with damages incurred while using it.
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