530 | Anti-Graffiti Protective Coating
CSL541Si-COAT
Conformal Coating
| Silicone
Conformal Coating
Due to the decrease in size of printed circuit boards (PCBs) and
increase in packing density, there is a greater risk of shorts,
corrosion of conductors and solder joints, dendritic growth and
electro migration of metal between conductors.
Conformal coatings or thin polymeric films which “conform” to
the surface of the printed circuit board (PCB) can improve the
long term reliability of the assembly.
A conformal coating acts as an electrical insulator. It protects
the electronic circuits from the environment including moisture
ingress and contaminants such as airborne dust which could
lead to corrosive effects and shorts. In addition, the use of
conformal coatings protects circuits and components from
abrasion and solvents. Stress relief is also provided for the
circuit board.
Benefits
•Resists moisture,
vibration, and
temperature
extremes
Why do silicones excel in Conformal
Coating applications?
Silicone elastomers physical properties that make them ideal
conformal coatings include:
• easy to use and repair
• excellent electrical properties
• flexibility, mechanical shock and vibration absorption
• resistance to ultra-violet rays, ozone, and weathering
• resistance to humidity, moisture, and water repellency
• excellent thermal stability
•Electrically
insulating
•UV stable
•Non-corrosive
•Processing
versatility
•Easy repairability
CSL541 100% Silicone Conformal Coating
CSL541 is a one part, moisture cure, room-temperature
vulcanizing (RTV) electronic grade 100% silicone conformal
coating.
CSL541 is designed for use in corrosion-sensitive electronic
equipment with no adverse effects.
CSL541 remains flexible from -40°C to 200°C (-40°F to 392°F).
CSL541 is recognized under the Components Program of
Underwriters Laboratories Inc.®
CSL541 is primarily used in applications where a conformal
coating is required to protect sensitive circuitry.
CSL541 can be applied by dipping, spraying or simple flow
coating, as well as robotic dispensing.
… CSL541 Product Characteristics 
www.cslsilicones.com
530 | Anti-Graffiti Protective Coating
CSL541Si-COAT
Conformal Coating
| Silicone
CSL541 Intended Uses
Typical
CSL541 coating is a 100% silicone formulation particularly
useful for protecting circuitry in severe service environments,
while maintaining a low stress environment for components
and connections. These severe conditions range from every day
temperature and humidity extremes seen in consumer electronics,
to the harsher automotive engine compartment applications and
the extremes demanded in military or industrial applications.
Applications
CSL541 Typical Properties‡
• Printed Circuit Board
manufacturing
Cure System
One part RTV/Oxime
• General EMS
Viscosity [cP]
• Electrical assembly
Skin Over Time at Standard Conditions2 [min]
Flowability
Pourable Liquid
4000
20
Cure Time at Standard Conditions - 10mil [hours]
1
1
Features
• Recognized under the
Components Program
of Underwriters
Laboratories Inc.®
• Neutral cure
formulation will not
corrode copper, brass
or silver
• Excellent
hydrophobicity
• Can be applied by
spray, flow and brush
techniques
15
Shore A
Hardness2 ASTM D2240 [points]
Dielectric Strength2 ASTM D149 [V/mil]
720.1 (283.5 kV/cm)
Volume Resisitivity ASTM D257 [ohm.cm]
2
>1.4 x 1012
‡Data is subject to change without notice. These values are not intended for use in preparing
specifications. For more complete information, please refer to the current Technical Data Sheets for these
products.
NOTES
1 Standard Conditions are 25°C (77°F) and 50% relative humidity
2 Cured for 7 days at Standard Conditions1
CSL541 Availability
Colors¥
Clear 000
¥The color chips are only representations of actual colors and should not
be considered an exact color match to finished product.
CSL541 is available in clear.
Custom colors may be available upon request.
Complementary Formulations
Alternate viscosity formulations are also available.
Packaging
CSL541 is available in 3.8L (1 US gallon) cans, 19L (5 US gallon)
pails and 189L (50 US gallon) drums.
Shelf Life and Storage
CSL Silicones Inc.
144 Woodlawn Rd. W.
Guelph, ON Canada N1H 1B5
+1 519.836.9044
+1 800.265.2753
www.cslsilicones.com
CSL541 has a shelf life of twelve months from date
of manufacture when stored in the original unopened
container in dry, shaded conditions, away from sources of
heat or ignition, and stored at or below 90°F (32°C).