Hydrophobic Moisture Blocking Conformal Coatings for Printed Circuit Boards and Electronic Devices Protection

High-Reliability Cleaning and Conformal Coating Conference

– November 18-20, 2014
Schaumburg, Illinois | Chicago Marriott Schaumburg

 

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VIDEO describing the unique hydrophobic moisture blocking and non moisture-water absorption properties of AIT PRIMA-PROTECT conformal coating in contributing to the unparalleled performance in protecting printed circuit board from damages in salt mist and/or in industrial environment with corrosive ions dissolved in the moisture and acid rains.

Ultra Hydrophobic Moisture Blocking Conformal Coatings for Printed Circuit Boards and Electronic Devices Protection, Protective Coatings for Electrical Contacts, Battery Terminals and Printed Circuit Boards:

  • Traditional acrylic, epoxy and polyurethane conformal coatings are not hydrophobic and does not provide adequate protection in heavy moisture and particularly susceptible to salt-fog and otherindustrial corrosive gases in heavy industrial and traffic environments.
  • Silicone based conformal coating while hydrophobic to water but allows very high moisture penetration (most as much as 5 to times of the rate of acrylic conformal coatings) and also susceptible to the same attacks of high concentration of moisture that carries with it the corrosive elements such as sodium and chloride ions in salt-fog, sulfur dioxide and other corrosive agents in air pollutants.
  • AIT has developed an ultra hydrophobic, super non-hygroscopic and moisture blocking conformal coating that has been proven to provide unparalleled effective protection against moisture, water, salt fog, salt spray and even direct salt water immersion for printed circuit boards.
Depending on where one resides, periodic high concentration of moisture is often the nature of outdoor electronic operation environments. Outdoor electronics such as that under the hood of an automobile requires a much better protection against moisture in hot summer weather.

Critical infrastructure such as electrical power stations need protection against corrosion  in the high voltage contact points and electrical switches and other controlling electronics requires protective coatings that can also withstand UV resistance besides moisture and acidic rains and other corrosive industrial environments.

During the storm surge from Katrina (2005) and Irene(2011) many power switch stations in the New York City and New Jersey Coastline were flooded with salt way and need total replacement. AIT PRIMA-PROTECT with the proven immersion protection capability will have spare many components to be replaced.

All AIT Conformal Coatings and Masking Materials are RoHs Compliant

PRIMA-PROTECT™ conformal coating for printed wiring boards,  electronics and electrical contacts has the following proven protection against moisture, salt-fog and  UV exposure  and water immersion at elevated temperature for long period of time:

  • Proven to far outperform all of the common conformal coatings in parallel testing. In fact, AIT PRIMA-PROTECT™ CC7090E and CC7130-E are the only conformal coating that performs for these extreme operation environments.
  • SOLARBLOC™ SC7130-UVB is the UV resistant coating for electrical contacts and any UV susceptible structures made with metal, wood and plastics.
  • PRIMA-PROTECT™ is molecularly flexible for great adhesion  and yet abrasion  reworkable and directly re-coat for protection after reworking.

Battery packs that are used for outdoor applications such as as in automobile and electric cars, safety and security electronics, displays and navigation are exposed to condensation moisture and thus need protection from corrosion and potential electrical shorts.  In the more extreme cases of marine or seacoast electronics, the protection requirements are far more stringent. AIT’s CC7090-E and CC7130-E is uniquely durable and ideal for these extreme conditions.

Outdoor LED displays and their internal electronics are good examples of electronics that need outstanding moisture and water spray protection.  AIT’s CC7090-E is engineered for ease of application while providing one of the best moisture barriers that can be achieved with traditional conformal coatings. SC7090-UVB is a proven non-yellowing coatings that protects the LED display and retained its brilliance for extended years of services.

AIT’s CC7090-E  and CC7130-E are engineered as an extreme protective conformal coating for printed wiring boards (PWB, PCB), even those boards with 5-10 micron thickness. AIT’s CC709-E and CC7130-E are particularly useful to protect intermetallic joints and battery terminals from corrosion when exposed to moisture, water, salt water and salt-fog.

AIT’s CC7090-E and CC7130-E are protective conformal coating for printed wiring boards (PWB, PCB), but it is also ideal for protecting power electronics, battery junctions and terminals in automotive electronics.  CC7090-E and CC7130-E are particularly useful protecting boat electronics, marine electronics and other electrical equipment.  Relatively easy removal with a suitable petroleum based solvent allows for easy repairs.

Protective Coating

AIT’s CC7090-E and CC7130-E are extreme corrosion protection coating includes a flexible moisture barrier making it ideal to protect electrical boxes and  terminals that are exposed to direct or indirect moisture, water degradation and/or moisture induced galvanic corrosion.

For outdoor enthusiasts that may need their smart phone and mobile electronic devices protected against possible water immersion, AIT’s CC7130-E can be brush coated onto any device to provide ultimate environmental security.

Traditional acrylic-based and epoxy conformal coating that has glass transition temperature around 30-70°C and induces excessive stresses during low temperature cycles in the usages and reduces the reliability of the electronic devices(http://www.slideshare.net/CherylTulkoff/how-conformal-coating-can-kill).

AIT PRIMA-PROTECT™ CC7090-E and CC7130-E are engineered to have glass transition temperature, Tg, at -55°C. That is, the PRIMA-PROTECT™ conformal coating is not sensitive to the thickness of coating applications and will not exert stresses on the components on the printed wiring boards. The unparalleled performance and reliability demonstrated in the parallel side-by-side testings are attributable to the incorporation and combination of moisture penetration blocking and molecular flexibility to allow wide latitude of coating thickness to provide the best protection of electronic devices against heat and moisture, salt fog and even salt water immersion. CC7090-E and CC7130-E are free of silicone and will be contaminate circuit boards for rework and soldering.

Ultra Hydrophobic, Super Non-Hygroscopic (Do Not absorb or Retain Moisture) and Moisture Blocking Conformal Coatings for Electronic Printed Circuit Board Protection:

Moisture Blocking, Non-hygroscopic and Hydrophobic Protective Coating for Automotive Electronics, Aerospace and Military Electronics, Marine and Shipboard Electronics, Solar Power Electronics, Medical Electronics, Mobile Consumer Electronics and Outdoor Electronics

Power generation such windmill are particularly effective and efficient at the shore. The same may also apply to the supplementary solar power generation and their corresponding  conversion electronics. However, the salt-fog represents one of the most corrosive environment that requires that coating protection beyond traditional chemistries.

“Whether solar, wind, or any other renewable energy technology, electronics are the critical component to convert, invert, connect, transmit, track, regulate and monitor the system. The electronics are, however, often the weak spot in all systems.

Take solar PV technology. Currently solar panel/module systems carry a warranty of 25-30 years. Most inverter electronics need replacement in 10-15 years. In wind turbines failure of the electronics within the nacelles are the leading cause of downtime and repair expense for OEM’s and wind farm operators.

While there definitely are going to be upgrades as technology advances over the years, the goal should be to upgrade because it is wanted, not because of a failure that requires an emergency repair and replacement.

The question is then, how to protect these densely populated and highly sophisticated electronics so ‘long-life’ becomes a reality. For many reasons, typical conformal coatings are not the answer.” (http://www.renewableenergyfocus.com/view/31842/coatings-protecting-renewable-energy-equipment/)

AIT CC7090-E and CC7130-E have been proven to provide unparalleled protection for electronics working in these and even harsher application environments including salt fog laden with sodium and chloride ions, corrosive acid rains laden with sulfur dioxide and hydrogen sulfide, and direct salt water immersion.

Printed circuit boards or printed wiring boards (PCB or PWB) with electronic components used in different industries are generally subjected to harsh operating conditions. Conformal coatings protect the circuitry from environmental conditions, such as water spray, moisture condensation, salt water and spray, vibration, chemicals, and other hazards. Conformal coatings also extend the working life of the circuit while ensuring better performance. The traditional conformal coating is typically thin, between 25 to 75 microns thick. Silicones, acrylics, epoxies, and polyurethanes are typical conformal coatings. They have been proven to be inadequate for this harsh application environment for the extended service life expected.

Automotive electronics, electrical equipment and electrical wiring are some of the most exposed electronics that are used outdoors.  AIT’s CC7130-E can be easily applied via brush or spray to protect electric terminals and electronics from moisture, water and other contaminants.

CC7090-E and CC7130-E are available from AITMART online:  http://www.aitechnology.com/store/ for those that wish to apply CC7090-E and CC7130-E directly and  protect their own automotive electronics.

AI Technology, Inc. has developed and engineered coatings for different applications and has designed a group of conformal coatings for extreme protection against condensing moisture, salt fog and spray and salt water immersion.  AIT also produces molecularly flexibile coatings for extreme environments, including the humid equators, aerospace, underwater and on the marine seacoast.

Sealed but not hermetically sealed electronics must be protected with a good conformal coating to avoid corrosion from condensed moisture on humid days.

Printed Circuit Boards and objects needing protection can be brushed, sprayed or dipped in protective coating and will air dry within 60 minutes without the need for extensive tools and equipments. One of the easiest to use, novel non-toxic based solution of CC7090-E and CC7130-E is designed for those not requiring long-term water immersion. The toluene free, non-toxic solvent CC7090-E and CC7130-E has been proven to last for years for device immersion in water.  When applied to marine and outdoor electronics, CC7090-E and CC7130-E provides extreme protection against salt water, salt spray and salt fog exposure. The effective thicknesses of CC7130-E can be as thin as 25 to 50 micron. However, with its low Tg at -55C , even dip coating with thick sections as much as 100-300 microns that other conformal coatings will shortened the coated electronics due to stress induced will not adversely affect the reliability other than improving the robustness of your finished electronic devices.

Additional advantages of CC7130-E and CC7090-E over traditional acrylic based coatings are:

  1. Extreme ease of application methods and “curing” time with or without heat
  2. Much lower dielectric constant and loss with CC7090-E and CC7130-E that are comparable to silicone but without silicone contamination issues
  3. Easy rework or repairs using CC7090-E and CC7130-E, even in the least industrial environment
  4. Superior performance against water condensation, moisture, water immersion and salt fog and spray corrosion

Outdoor LED lights including LED signal lights and their internal electronics are some of the outdoor electronics that can benefit from the conformal coating protection of CC7130-E and CC7090-E. The coated electronics life will be extended to match the intrinsic life of the LED light itself.

Conformal Coatings for Electronic Circuit Board Protection and their Relative Merits
CC7090-E CC7130-E UVHC7150-E
“Curing Mechanism” Air dry @ <60 min

(Toluene Free solvent )

Air dry @ <60 min

(IPA solvent evolution)

UV and/or Heat

Dual curing

Optical Transparency 80% Transparency 70% Transparency >90% Transparency
Ease of Repair Hard Nylon Brush

Mineral spirit wipe

Hard Nylon Brush

IPA (Isopropyl-alcohol) wipe

Abrasion Brush
Water Immersion Resistance Outstanding Good Good
Moisture and Spray Resistance Outstanding Outstanding Good
Salt Water Immersion Resistance Outstanding Good Good
Salt Fog and Spray Resistance Outstanding Outstanding Good
Temperature Range & Flexibility Outstanding

Tg @ -55°C

9,000 psi modulus

>120% Elongation

Good

Tg @ -40°C

12,000 psi modulus

>100% Elongation

Good

Tg @ -40°C

16,000 psi modulus

>60% Elongation

Effective Protective Thickness 5 to 15 micron 10 to 30 micron 25-75 micron
Dielectric Constant and Loss 2.8/0.01 @ 1KHz

Outstanding

3.6/0.02 @1 KHz 4.2/0.02 @1 KHz
Viscosity 300 cps 1,000 cps 2,000 cps
Chemical Resistance Outstanding Outstanding Outstanding
Solvent Resistance Poor for petroleum and non-polar solvents

Outstanding for all polar solvents

Moderate to poor for most polar solvents

Outstanding for petroleum solvents

Good to outstanding for almost all solvents
Abrasion Resistance Pencil Hardness: 2H

Designed for repair

Pencil Hardness: 2H

Designed for repair

Pencil Hardness: 2H

Designed for repair

Conformal Coating Heat/Moisture Classification Suitable for Class 1, 2 and 3 applications with extended 85°C/85%RH exposure

Withstand long-term direct 85°C water immersion.

Designed for Class 1 and 2 applications

Not recommended for long-term direct water immersion

Suitable for Class 1, 2 and 3 applications with extended 85°C/85%RH exposure
Fungi Resistance

UV Fluorescence

UV Resistance

Fungi resistant per spec

UV fluorescent for ease of inspection and verification

Good

Fungi resistant per spec

UV fluorescent for ease of inspection and verification

Good

Fungi resistant per spec

UV fluorescent for ease of inspection and   verification

Good

Outdoor solar controlling circuits and power electronics are some of the outdoor electronics that are exposed to extreme conditions of thermal cycling and long term usage over 20 years. While the solar cells and panels may survive under the condensing moisture and water spray conditions, the solar panel electronics will benefit from the protection conformal coatings of CC7090-E and CC7130-E.

The following are some of the critical comparative data for the traditional conformal coating materials to that of AIT pioneering new material technology for protecting printed wiring boards and electronic devices:

TYPE PRIMARY AND CRITICAL PROPERTIES FOR PRINTED CIRCUIT BOARD (PWB) CONFORMAL COATING
Material Costs Ease of Application Costs of Repair Tg (°C) Thickness for Stress Control Moisture Absorption-Retention (%) Moisture Penetration (gm/m2/day/2) Salt Fog Tolerance Sulfur Dioxide and Acid Rain Penetration Temperature Range
Acrylic Low Brush, dispense, spray, (dip-coating is not recommended) Low 10   to   60 40-60µ (Thicker coating will shorten MTTF) 0.3 550 Fair Fair Up to 125°C
Epoxies Medium Brush, dispense, spray, (dip-coating is not recommended) High 50   to   90 40-60µ (Thicker coating will shorten MTTF) 0.5-1.0 20-37 Fair Fair Up to 150°C
Polyurethanes Medium Brush, dispense, spray, (dip-coating is not recommended) High 50   to   90 40-60µ (Thicker coating will shorten MTTF) 0.25-0.80 37-57 Fair Fair Up to 125°C
Silicone High Brush, dispense, spray, dip-coating High <-55 Not Critical (Flexible and stress-free) 0.01 70-1872 Poor Poor Up to 200°C
Parylene Very High Vacuum High ? <5µ ? 16-217 Good Good Up to 125°C
PRIMA-PROTECT™ CC7090-E,

CC7130-E

Medium Brush, dispense, spray, dip-coating Low -55 Not Critical (Flexible and stress-free) <0.01 <10 Outstanding Outstanding Up to 85°C and 125°C respectively
http://www.academia.edu/1902960/Coating_materials_for_electronic_applications_polymers_processes_reliability_testing (Source for data of moisture penetration and absorption for acrylics, epoxies, polyurethanes, silicones and Parylene)

Epoxy, acrylic or traditional hard and hydrophilic polar protection coatings are not nearly as effective as super hydrophobic conformal coatings such as AIT’s CC7090-E and CC7130-E.  With epoxy or traditional hydrophilic protective coatings, moisture can still migrate underneath the circuit board, causing corrosion and degradation such as swelling on the supposedly protected area and peeling of the protection.

AIT application engineering, sales, chemists, and material scientists are ready to serve your special needs and applications. Please inform us of your requirements using the Contact tab or click on the button below:

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AIT technical sales and service department can also be reached at: 1-609-799-9388 or 1-800-735-5040 (EST) and Fax: 609-799-9308