Your Professional onformal Coating for PCB Supplier
MCOTI Technology Co., Ltd., established in 2008, is a professional electronic adhesive supplier. The company is committed to providing comprehensive solutions including adhesive materials, curing and dispensing equipment for electronic equipment and automotive parts assembly.
In terms of products, MCOTI specializes in the production of adhesives, industrial glues, electronic adhesives, dispensing equipment, adhesive curing equipment and other products, and provides customers with excellent customized solutions and services.
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![Acrylic Conformal Coating for PCB]()
Acrylic Conformal Coating for PCBAcrylic conformal coating is a protective material applied to printed circuit boards (PCBs) to shield them from environmental factors like moisture, dust, chemicals, and temperature changes. -
![Silicon Conformal Coating for PCB]()
Silicon Conformal Coating for PCBSilicone conformal coating is a protective material applied to printed circuit boards (PCBs) to shield them from environmental factors such as moisture, dust, chemicals, and temperature variations. -
![Polyurethane Conformal Coating for PCB]()
Polyurethane Conformal Coating for PCBPolyurethane (PU) conformal coating is a protective material used on printed circuit boards (PCBs) to safeguard them from environmental factors such as moisture, dust, chemicals, and temperature
Our Service
Technical Communication
CTQ : Understand the customer’s application and determine key performance requirements.
Problem Resolution: Provide technical data such as product physical properties, weather resistance, conductivity/thermal performance, and compliance certifications.
Case Sharing: Share successful solutions from previous projects to offer insights for similar applications.
Technical Support
On-Site Guidance: Offer on-site assistance when needed to support adhesive application, curing, and process optimization.
Application Training: Train the customer’s technical team on adhesive usage and quality control to enhance their application capabilities.
Problem-Solving: Quickly address issues such as adhesion failure or curing anomalies during the usage process and propose effective solutions.
Conformal Coating for PCB
Conformal coating is a layer of polymer material that is applied onto a printed circuit board (PCB) to safeguard the board and its components from potentially damaging environmental conditions, while ensuring that the board’s functionality remains unaffected. It acts as an insulating layer while protecting the PCB surface. These coatings ‘conform’ to the inherent irregularity of PCB structure and environment. Typically applied at 25-250µm thick, the film can protect against dust, various temperature changes and other abrasive effects, ultimately extending the working life of the PCB.
MCOTI Silicon Conformal Coating for PCB Recommendations
Typical Products N-PU 5200:
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Chemical Type |
Acrylic acid |
|
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Composition |
One-component |
|
|
Color |
Light yellow |
|
|
Density @ 25OC |
MPa・s |
70-150 |
|
Density |
G/cm3 |
~1.1±0.05 |
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Curing conditions |
UV |
60-2000 mJ/cm2 |
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Hardness |
GB_T 67395 |
HB |
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Dielectric strength GB_T 1408.1 |
KV/mm |
60 |
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Flammability |
UL-94 |
V0 |
Three Stages Of Drying And Curing In The Conformal Coating Process:
Stage 1: Tack Drying
This refers to the stage when the coating has dried enough and does not feel sticky when handled. Acrylic solvent-based coatings may reach this “tack dry” stage within 10-15 minutes, depending on factors like coating thickness, solvent type, extraction rates, temperature, and humidity. However, the coating will be soft to handle and susceptible to damage at this point.
Stage 2: Fully Dried
The conformal coating and PCB can be handled normally but the coating is not yet fully cured. This is advantageous for production purposes, as the PCB can be further processed and inserted into packaging. It is important to note that the coating has not yet undergone the curing process.
Stage 3: Fully Cured
The conformal coating has achieved its peak properties when it undergoes the curing process, during which the coating undergoes a transformation. The speed of the curing process varies depending on the coating used.
How are conformal coatings tested?
In order to ensure the board has the necessary protection for its intended purpose, the boards must be tested under a series of conditions. This can be done through basic testing that looks at electrical performance and humidity testing, or through advanced testing which tests a number of characteristics of the board, such as flexibility and adhesion, on top of the usual electrical and humidity testing.
Humidity testing is extremely important to ensure the board is protected from corrosion. Flexibility testing checks that the board has a certain degree of flexibility to ensure the coating doesn’t crack or get damaged during the curing process or afterwards.
Another important part of testing is to ensure the coating is properly glued to the board. Without this the coating will not provide full protection. Cross hatch testing is an effective method of testing the adhesion of coating to the boards. Lines are drawn on the board in a cross pattern, and then tape is applied to these lines and carefully removed to analyse if any of the coating has been damaged.
How To Measure Conformal Coating Thickness
Conformal coatings are usually applied as very thin layers, providing optimal protection while minimizing concerns such as heat entrapment, excess weight, and other issues. Typically, the common applied thickness range is from 1 to 5 mils (25 to 127 microns) to achieve maximum protection while minimizing these concerns. So how do you measure the thickness of a conformal coating? Several different methods of measuring conformal coating thickness are listed below.
This is an inexpensive, quick and easy method to measure the thickness of coating while still wet. These gauges feature a collection of notches and teeth, with each tooth having a calibrated and known length. The gauge is placed directly onto the wet film for measurement purposes. To determine the dry film thickness, the wet film measurement is multiplied by the solids content after completion of the coating application process.
Micrometer thickness measurements can measure down to ± 10 um. Before and after the application of conformal coating, measurements are taken on the surface of a PCB or a test coupon. The difference between the two readings is then calculated to determine the coating thickness, and the standard deviation is calculated to assess the coating’s uniformity.
The thickness measurement process entails placing the test probe head flat onto the surface of the conformal coating, and the measurement results are nearly instantaneous. The measurements are highly accurate and non-destructive, provided that there is metal present directly beneath the tested point on the circuit board. Otherwise, the measurements will be unreliable, and if the probe is not placed flush on the test area, inaccurate readings will appear.
This method utilizes ultrasonic waves to measure the thickness of coatings, eliminating the requirement for a metal backplane as seen in eddy current probes. The thickness is determined by calculating the time it takes for the sound to travel from the transducer, through the coating, reach the board’s surface, and back through the coating to the transducer. In order to ensure proper contact with the surface, a conductive medium such as propylene glycol or water is necessary. Unless the conductive medium has an adverse impact on the coating, this test is generally regarded as non-destructive.
Application Areas Of PCB Conformal Coating
Consumer electronics products
Conformal coatings for electronics application can protect circuits used in home appliances, enabling them to overcome many problems and issues.
01
Automotive industry
Conformal coatings are necessary for meeting the fundamental requirement of long-term reliability of automotive electronics, which have always been essential and cannot be done away with.
02
Aerospace
Due to the particularity of the application environment, the aerospace environment has extremely strict requirements on the application of electronic equipment, especially in terms of rapid compression and decompression. Therefore, various of conformal coatings have been widely used due to their pressure-stable properties.
03
Navigation
Electrical circuits in marine equipment are often vulnerable to damage by Both fresh and brackish water. Conformal paint are applied for maximum protection of sailing equipment on and under seawater.
04
Medical insurance
Conformal coatings serve as a protective layer for electronic devices, shielding them from the corrosion caused by external chemicals or specific application environments. This ensures the devices’ consistent and smooth operation while preventing corrosion.
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