Environmentally Friendly Conformal Coatings for Electronic Circuitry

For easy application and reliable performance, select Master Bond for your conformal coating needs. Master Bond's wide range of compounds will extend the life of your electronic assemblies and provide protection against moisture, abrasion, solvents, and elevated temperatures. These compounds can be applied by spraying, dipping, flow coating, and other conventional processing techniques. They are 100% reactive and contain no solvents or diluents.

Conformal coatings, UV curing adhesives

UV Curable Conformal Coatings

Master Bond range of conformal coatings consists of one and two part epoxies, silicones and latex systems. Where rapid cure speeds are of prime importance, we offer one part, UV curable systems. For intricate parts with shadowed-out areas, we also offer special "dual cure" coatings which cure with UV light and with the addition of heat. Grades vary in viscosity, cure speed, flexibility, chemical and temperature resistance, electrical properties, color, etc. Special formulations are non-yellowing, optically clear, cryogenically serviceable, repairable and have exceptional dielectric properties. Ultra-low viscosity coatings are available for confined spaces. For over 30 years, manufacturing companies worldwide have depended on Master Bond's job-proven compounds.

Master Bond Conformal Coating Products

The following table summarizes Master Bond's range of conformal coating system.




Two part epoxy with low viscosity and good physical properties. Cures rigid. Optically clear. Meets NASA low outgassing specifications.


Easily processable, two part epoxy with excellent chemical resistance, particularly to solvents. Available in black.


Easy to process, ultra low viscosity, one part, no-mix, very soft silicone material. Excellent moisture resistance.


Low viscosity, two part epoxy with outstanding chemical resistance. Withstands autoclaving. USP Class VI biocompatibility tested.


Two part epoxy with superb toughness. Allows for parts to be retrieved, but still offers outstanding environmental protection.


Dual cure, low viscosity, rigid curing system. Offers excellent environmental protection. Cures by UV light and by heat at 125°C in shadowed out areas.


Typical Applications for Master Bond Conformal Coatings

Typical applications of Master Bond's range of products for conformal coatings include:

• Solar cells and modules
• Power resistors
• Capacitors
• Impregnating coils
• Ceramic circuits
• Transducers
• Photoelectric cells
• Magnetic recording heads
• Inductors
• Switches

• Hybrid circuits
• Relays
• Film applications on components
• Sensors & Sensor arrays
• Printed circuit board applications
• Printed wiring board (PWB) applications
• Electrosurgical instruments
• Protects sensitive components & fine pitch designs
• Ferrite cores & bobbins of pulse transformers

Performance Properties for Specific Master Bond Grades

Environmental Protection of Conformal Coatings

Master Bond conformal coatings offers environmental protection from the following:

• Humidity & moisture
• Weathering
• Thermal cycling & shock
• Temperature extremes
• Abrasion
• Dust
• Mechanical shock & vibration
• Voltage breakdown
• Corrosion
• UV exposure

Chemical Resistance of Conformal Coatings

Master Bond's range of conformal coatings provides resistance to solvents, acids, bases, and other chemicals outlined in the following table.

•  water
•  acetone
•  toluene
•  MEK
•  mineral spirits
•  isopropanol
•  xylene

•  bleach
•  steris
•  cydex
•  skydrol
•  methanol
•  ethanol
•  gasoline

•  butylacetate
•  potassium hydroxide
•  10% hydrofluoric acid
•  96% sulfuric acid
•  10% nitric acid
•  50% sodium hydroxide
•  35% ammonium hydroxide

Conformal coatings, UV curing adhesives

Conformal Coating Application Techniques

Master Bond's range of conformal coatings can be appled by the following techniques.

• Brushing
• Roller Coating
• Flow Coating
• Dipping
• Spraying
• Spatula
• Robotic dispensing

Conformal coatings, UV curing adhesives

High Performance Conformal Coatings for the Electronic Industry

Master Bond's range of conformal coating systems is designed to offer superior quality and long-term durability. They have earned a well-deserved reputation for their performance upon exposure to hostile environmental conditions. Select from a wide range of systems conveniently packaged for ease of use. These compounds are available in different viscosities, cure times, chemical resistances, electrical properties, colors, etc. to best meet specific requirements. They are presently employed in applications ranging from design and production to repair, maintenance and field service.

Important Conformal Coating Performance Requirements

Master Bond's range of conformal coatings are designed to meet specific performance requirements. Among the most important are:

• Chemical Resistance
• Cryogenically Serviceable
• Easily Repairable
• Electrically Insulative
• Excellent Adhesion
• Dimensional Stability
• High Temperature Resistance
• Low Thermal Expansion Coefficient

• Low Outgassing
• Low Shrinkage
• Low Stress
• Resistance to Water
• Peel Strength
• Durability
• Thermal Cycling
• Shock Resistance

• Thermal Conductivity
• Vibration Resistance
• Dielectric Strength
• Volume Resistivity
• Dielectric Constant
• Dielectric Factor
• Hardness
• Tensile Strength

Conformal Coating Systems

Unique low viscosity, two part epoxy system offers rapid curing in thin sections. Optically clear and non-yellowing. Cures at room temperature. Chemically resistant.

High-flexible, two component epoxy compound with 1 to 1 mix ratio, by weight or volume. Resists severe thermal cycling and shock. Service temperature range from 4 K to 250° F. Outstanding electrical insulation properties.

MasterSil 713
One component silicone elastomer. Exceptionally low viscosity. Provides vibration and shock protection. No mix system.

Optically clear, non-yellowing one part UV curable compound. Outstanding durability and toughness. Fast cures at room temperature. Thermal shock resistant.

This information has been sourced, reviewed and adapted from materials provided by Master Bond Inc.

For more information on this source, please visit Master Bond Inc.


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