How to choose the right conformal coating, what is conformal coating, and the role of conformal coat

The harm to human health caused by conformal coating is limited in normal use. You can choose Schneills environmentally friendly conformal coating. Founded in 2007, Schnees is an independent brand enterprise integrating R&D, manufacturing, sales, service and training in the field of electronic industry adhesives.

With advanced adhesive material technology, it has accumulated 8000+ customers in the market, and has established a leading position in the fields of coating, thermal conductivity, potting, and bonding. The products have passed international certifications such as flame retardant UL, ROHS, REACH, and non-toxic, and have obtained a number of patents.

At present, there are three main types of conformal coatings on the market: acrylic conformal coatings, silicone conformal coatings, and polyurethane conformal coatings; These conformal coating coatings can be mainly used to protect PCBs, components and flexible circuit boards from damage, and are used to prevent moisture, mildew, corrosion, salt spray and other excellent performance, but different types of conformal coatings have different emphasis.

Acrylic conformal coating, with excellent corrosion resistance and dielectric strength, is mainly used for insulation protection of high-voltage discharge or short circuit;

Silicone conformal coating, with great flexibility and high and low temperature resistance, is very effective in protecting circuit boards and components from extreme temperatures and vibration damage;

Polyurethane conformal coating can form a polymer dense protective film layer after curing, with insulation, moisture-proof, dust-proof, pollutant-proof, anti-corrosion and other properties, which is more suitable for high-reliability hybrid integrated circuits.

Different types of conformal coating, the focus is different, the landlord you choose before you first figure out the use of the product environment, and then for this environment to choose a relatively suitable conformal coating.

Conformal coating has a variety of names according to the requirements and focus of each region and each manufacturer, such as conformal coating, moisture-proof coating, conformal coating. Conformal coating is a specially formulated coating used to protect circuit boards and their related equipment from the environment, so as to improve and extend their service life and ensure the safety and reliability of use.

Under realistic conditions, such as chemical, vibration, high dust, salt spray, humidity and high temperature, the circuit board may have corrosion, softening, deformation, mildew and other problems, resulting in circuit failure. Conformal coating is applied to the surface of the circuit board to form a protective film of three properproof (conformal refers to moisture-proof, anti-salt spray, and anti-mildew). In applications such as those containing chemicals (e.g

fuel, coolant, etc.), vibration, moisture, salt spray, humidity and high temperature without the use of conformal coating of the circuit board may be corroded, mold growth and short circuit, etc., resulting in circuit failure, the use of conformal coating can protect the circuit from damage, thereby improving the reliability of the circuit board, increasing its safety factor, and ensuring its service life. In addition, because the conformal coating prevents leakage, it allows for higher power and closer PCB spacing. This makes it possible to achieve the purpose of miniaturizing components.

What are the types of conformal coatings?

Conformal paint is also called PCB electronic circuit board protective oil, coating oil, moisture-proof paint, three-proof coating, waterproof glue, insulating paint, anti-corrosion paint, anti-salt spray paint, dustproof paint, protective paint, coating paint, three-proof adhesive, etc., which are classified as follows:

Conformal coatings can be divided into acrylic, silicone, and polyurethane conformal coatings from the chemical composition; In terms of curing methods, there are solvent-based curing, room temperature curing, thermal curing and ultraviolet curing.

1. Conformal coating with solvent acrylic resin (the most widely used and popular product in the market).

Features: It has the characteristics of surface drying, fast curing time, good three-proof, cheap, transparent color, flexible texture, and easy repair.

2. Non-solvent acrylic resin conformal paint.

Features: UV curing, can be dried in a few seconds to a dozen stopwatches, the color is transparent, the texture is hard, and the chemical resistance and abrasion resistance are also very good.

3. Polyurethane conformal coating.

Features: Brittle texture, excellent solvent resistance. In addition to superior moisture-proof performance, it is also stable in low temperature environments.

4. Silicone conformal coating.

The soft elastic coating material can relieve pressure well, withstand high temperature of 200 degrees, and is easy to repair.

Film coating adhesive, also known as circuit board conformal coating insulating paint, is used to protect circuit boards and related equipment from the erosion of the environment. The film coating adhesive is applied to the surface of the circuit board to form a light and flexible three-proof protective film with a thickness of about 25 50um, which can isolate sensitive electrical components from the harsh environment, thereby improving the reliability of the circuit board, increasing its safety factor, and ensuring its service life.

Coating rubber features:

1.Good protective performance: In addition to the general sense of "three prevention" (moisture-proof, mildew-proof, anti-salt spray), it also has the functions of anti-vibration, anti-friction, dust-proof and anti-loosening of parts.

2.Good electrical insulation performance: good dielectric properties, arc resistance, electric spark resistance, high electrical breakdown strength, and good waterproof performance.

3.Good temperature resistance: high temperature resistance up to 150, low temperature resistance up to -50.

4.Good chemical resistance: oxidation resistance, thermal stability and anti-aging performance, can resist the corrosion of a variety of different concentrations of acids, alkalis and salts.

5.Good process performance: it can be cured at room temperature or low temperature, the paint film is dense and bright, with strong adhesion and decoration. The application process is simple, and the viscosity can be adjusted according to the process without affecting the product performance.

Wanhua Composite Materials provides you with professional adhesive solutions.

AOSBORNE 90 is a high-viscosity one-component acrylic protective coating designed to protect printed circuit boards operating in harsh environments. It has excellent high and low temperature resistance, weather resistance, electrical insulation performance and excellent three-proof performance (moisture-proof, salt-spray-proof, mildew-proof), and fully complies with the requirements of the EU RoHS directive.

Huacheng conformal coating, professional: waterproof, dustproof, anti-corrosion, anti-leakage, etc. . . Huacheng conformal coating, the quality has passed the EU SGS environmental protection certification, and the official website can apply for a free sample trial.

Typical applications include the following civil and commercial applications:

1.Household appliances.

Conformal conformal coatings provide protection for electronic circuits in household appliances, making them resistant to:

a.water and detergent (washing machine, dishwasher).

b.High temperatures (e.g., microwave ovens).

c.Chemical environment (air conditioner, dryer).

d.Harmful substances (computers) in the office and at home

e.Adverse external environment (burglar alarm device).

2.Automotive electronics.

The automotive industry requires conformal coating to protect circuits from the hazards of gasoline evaporation, salt spray brake fluid, etc. The use of electronic systems in automobiles continues to grow rapidly, so the use of conformal coatings has become an essential requirement to ensure the long-term reliability of automotive electronics.

3.Aerospace.

Due to the particularity of the use environment, the aviation and aerospace environment has strict requirements for electronic equipment, especially under the condition of rapid pressurization and decompression, it is still necessary to maintain good circuit performance; Therefore, the pressure stability of conformal coating is widely used.

4.Shipbuilding.

Whether it is fresh fresh water or salty seawater, it will cause harm to the electrical wiring of ship equipment; The use of conformal coatings provides maximum protection for equipment above and below the water, as well as submerged and underwater.

5.Medical devices.

Conformal coatings for Schneilles protect electronic devices from external chemicals and special environments to ensure their continued stability.

Conformal coating is also called PCB electronic circuit board moisture-proof oil, coating oil, moisture-proof paint, three-proof coating, waterproof glue, insulating paint, anti-corrosion paint, anti-salt spray paint, dust-proof paint, protective paint, coating paint, three-proof adhesive, etc., the PCB circuit board that has used the three-proof coating has waterproof, moisture-proof, dustproof "three-proof" performance and cold and thermal shock resistance, aging resistance, radiation resistance, salt spray resistance, ozone corrosion resistance, vibration resistance, good flexibility, strong adhesion and other properties.

Are you kidding us? Don't you know a lot?

Which conformal coating can be repaired.

The "three proofs" of conformal coating refer to moisture-proof, salt-spray-proof and mildew-proof.

The role of conformal coating:

Conformal coating is a specially formulated coating used to protect circuit boards and their related equipment from the environment.

1) Conformal coating has the effect of moisture-proof, salt-spray-proof and mildew-proof on the circuit board. Its coating is a very thin protective layer of electronic circuits and components, which can enhance the moisture-proof and anti-fouling ability of electronic circuits and components and prevent solder joints and conductors from being eroded, and can also play a role in shielding and eliminating electromagnetic interference and preventing short circuits of circuits, and improving the insulation performance of circuit boards.

2) In addition, the coating protective film is also good for the abrasion and solvent resistance of circuits and components, and can relieve the pressure caused by periodic changes in temperature.

3) Withstand mechanical vibration and swing, thermal shock, and operation at high temperatures.

4) It can reduce the degradation of electronic operation performance to a minimum.

5) and thus allows for higher power and closer PCB spacing.

SIRNICE conformal coating has superior insulation, moisture-proof, leakage-proof, shock-proof, dust-proof, anti-corrosion, anti-aging, corona resistance and other properties, and is specially designed to protect circuit boards from environmental erosion. But it is correct to say that the three-proof paint and three proofs refer to moisture-proof, salt-spray-proof, and mildew-proof.

The application range of conformal coating is very wide, mobile phones, TVs and other civil appliances are only a small part, and the application of conformal coating has been extended to aerospace, medical and automotive industries. In the aerospace field, the requirements for electronic equipment are very strict, and in extremely harsh environments, the demand for conformal coatings that can protect electronic equipment will definitely be broad. Lime conformal coating has excellent three-proof effect.

The three proofs of conformal coating generally refer to moisture-proof, dust-proof, and harmful gas-proof, of course, mildew-proof and salt-spray proof, and different products in different industries may have different applications.

As mentioned above, in some environments, such as vibration, high dust, salt spray, humidity and high temperature, the circuit board may have problems such as corrosion, softening, deformation, and mildew, resulting in the failure of the circuit board.

It is correct to say that the conformal coating is not only three proof, it can be moisture-proof, anti-salt spray, anti-mildew, dust-proof, anti-corrosion, anti-aging, and is dedicated to protecting the circuit board from environmental erosion.

Conformal coating is a kind of conformal coating that is currently used in the market for the protection of PCB motherboards.

The most important embodiment is: moisture-proof, anti-corrosion, anti-hydrochloric acid, anti-fogging and other effects.

It is waterproof, dustproof, and mildew-proof Now with the development of technology, conformal coating has been given more functionsConformal coating is a specially formulated coating used to protect the circuit board and its related equipment from the erosion of the bad environment. Conformal coating has good high and low temperature resistance; After curing, it becomes a transparent protective film, which has superior insulation, moisture-proof, leakage-proof, shock-proof, dust-proof, anti-corrosion, anti-aging, corona resistance and other properties.

The market is generally divided into solvent-based conformal coating and solvent-free conformal paint, solvent-based conformal coating is with volatile harmful gases, leaving the inherent content of solvent-free conformal coating, that is, 100% solid content, environmental protection, no harmful gases, the market is currently divided into according to the material: silicone conformal coating, polyurethane conformal coating, acrylic conformal coating From the curing method, there are solvent-based curing, room temperature curing, thermal curing and ultraviolet curing.