Polyurethanes (Urethane Resin- UR) are polymeric, flexible, insulating, hard and chemically resistant (Acid—Alkali—Salty water) conformal coatings that are used to protect electronic parts from chemical corrosion, oil, moisture, fungus, and static discharges. Polyurethane coatings are supplied as single or two-component formulas. These coatings are suitable for printed circuit board applications such as sensors in the oil and gas industry, automotive, agriculture and common electronics. Polyurethane can be optically excited under UV-light and fluoresces therefore its inspection is also straightforward. Optically transparent coatings with a bit of tint are visually suitable for encapsulation purposes. Maximum service temperature for these conformal coatings (depending on the type) is ˂130 °C.
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polyurethane conformal coatings
Used for aerospace. automotive, commercial, defense, industrial and medical applications, conformal coatings are applied in film layers generally 30-130 microns (micrometers/μm) thick, or 0.0012-0.0051 inches (“). Conformal films’ exceptional thinness is their greatest asset. Coatings safeguard printed circuit boards (PCBs) and similar electronics from performance malfunction generated by unwanted contact with:
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acrylic conformal coating,
parylene conformal coating,
silicone conformal coating,
urethane conformal coating,
conformal coating types
Available in five basic material types, conformal coatings can be readily adapted as protective, insulating films for electronics. However, there can be some confusion about which type is best-suited for a specific use. Clearly defining the performance parameters for the component[s] to-be-coated helps coordinate the conformal film material with a unit’s functional requirements. Accurate assessment of environmental conditions like anticipated levels of corrosion, contact with foreign particulates, expected concentrations of moisture/salt spray, temperature fluctuations and vibrational range determine which coating type is best-suited to your electronics’ applications. Without appropriate protection, printed circuit boards (PCBs) and similar electronics will not survive harsh environments, and malfunction.
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parylene,
silicone conformal coating,
urethane conformal coating,
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epoxy conformal coating,
ruggedization,
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electronic conformal coatings
Appropriately selected and applied, conformal coatings provide essential working protection for printed circuit boards (PCBs). However, removal of conformal coatings is necessary if the wrong coating material is selected relative to the PCB’s functional requirements, inadequately supporting its operating environment. Poor coating application can trigger failure mechanisms within the assembly, also calling for its removal and re-application.
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Printed circuit boards (PCBs) electrically connect and power all but the simplest electronic products. To function as designed, PCBs and their components – capacitors, resistors, etc. – require protection against operating problems caused by corrosive liquids, dust, physical shock, temperature extremes and, in the case of medical implants, bodily fluids. Conformal coatings are applied over PCBs to safeguard mechanisms and maintain functionality.
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parylene conformal coating,
silicone conformal coating,
conformal coatings,
urethane conformal coating
Acrylic (AR) and polyurethane (UR) conformal coatings are among the best known and most commonly used conformal coating materials. As liquid coatings, both can be applied to substrates through a variety of methods:
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conformal coating,
urethane conformal coating,
coating comparison
Electronics manufacturers need devices that withstand heat, cold, rain, snow, vibration, fungus, oxidation, and corrosion through decades of operation.
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parylene,
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Parylene and urethane conformal coatings share many characteristics. Both are physically strong, resistant to chemicals and mitigate tin whisker formation. This doesn't mean that the two compounds are interchangeable, though. While parylene offers a unique blend of capabilities, many projects choose urethane because of its cost, strength and other advantages.
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Acrylic and urethane conformal coating are widely used conformal coatings. While they share the same methods of applications and ultimate end item uses, there are some differences that should be addressed prior to deciding what conformal coating is the best for your project.
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HumiSeal 1B31,
urethane conformal coating,
MG Chemicals,
HumiSeal,
Humiseal 1A33
Parylene conformal coating is a very robust coating, but sometimes it is not the right fit for a customer’s application for one reason or another. The entire conformal coating process is based on first identifying the standards to be used and customer’s protection desired. It would therefore only make sense that there are alternatives to parylene for different conformal coating demands.
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parylene,
parylene conformal coating,
conformal coating,
silicone conformal coating,
urethane conformal coating
Silicone and urethane are two of the most popular
conformal coating types. They are widely used for a variety of their properties, but which is a better coating? While this ultimately depends on your application, let’s take a look at some of the pros and cons of each.
Silicone Conformal Coating
Benefits
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Type UR (urethane resin) conformal coatings are a popular choice for conformal coating projects because of their resistance to chemical solvents, hardness, and moisture protection. There are many different varieties of type UR conformal coatings such as:
- HumiSeal 1A33
- HumiSeal 1A20
- Humiseal 1A27
- Humiseal 2A64
- HumiSeal 1A34
- Hysol PC18M
- CONATHANE CE-1155-35
- CONAP CE-1170
- CONATHANE CE-1164
- Techspray Fine-L-Kote
- MG Chemicals 4223
- Electrolube PUC
You should consider using type ur conformal coating whenever your application has any issues with chemical resistivity as type ur coatings are very resistant to chemical solvents. Type ur conformal coating is also smart to include in any tin whisker mitigation strategy, as NASA studies have shown that urethane conformal coatings are one of the few ways to successfully mitigate tin whisker growth. Finally, applications that can see any direct mechanical wear against the coating should consider urethane conformal coatings as well.
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MG Chemicals,
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HumiSeal,
Humiseal 1A33,
type ur conformal coating
Tin whiskers are electrically conductive, crystalline structures of tin that sometimes grow from surfaces where tin (especially electroplated tin) is used as a final finish. They typically grow from lengths of 1-2 millimeters (mm) but have been observed to lengths in excess of 10 mm. They are a serious issue in the electronics world because they have been known to cause short circuits between circuit elements.
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conformal coatings,
HumiSeal 1B31,
tin whiskers,
tin whisker mitigation,
urethane conformal coating
Conformal Coatings are used regularly in an attempt to cover technology designs on printed circuit boards (PCBs). Normally, this is done by using a pigmented (coloured) conformal coating which obscures the components below the conformal coating material.
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conformal coating removal,
Nexus3C,
epoxy conformal coating,
reverse engineering
Urethane conformal coating is becoming an increasingly popular conformal coating choice. However, it is not suitable for all applications. Instances where the product is going into a high vibration environment or has a high heat requirement would not ideal candidates for urethane conformal coatings.
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parylene conformal coating,
conformal coating,
silicone conformal coating,
urethane conformal coating,
Humiseal 1A33
While
acrylic conformal coating does have its many benefits, there are some applications whenever it is not the ideal
conformal coating to be using. Typically in applications that have exposure to solvents, high temperature requirements, or require coating hardness, acrylic conformal coating should not be used.
Solvent exposure
In applications that have an exposure to solvents, acrylic conformal coating is not the best choice. Acrylic conformal coating can be removed with a weaker solvent such as isopropyl alcohol or xylene. Whenever it faces even stronger solvents, it will not offer the protection that is needed, especially if your product is a mission critical device. Other coatings, such as urethane or parylene conformal coating have a far better resistance to solvents than acrylics.
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parylene conformal coating,
conformal coating,
silicone conformal coating,
conformal coatings,
HumiSeal 1B31,
urethane conformal coating,
HumiSeal,
epoxy conformal coating
Urethane conformal coatings are an excellent choice to use for many
conformal coatingprojects. Because of their resistance to chemical solvents, usefulness at mitigating tin whiskers, and overall hardness, they are a very popular conformal coating choice.
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parylene conformal coating,
conformal coating,
conformal coatings,
tin whiskers,
tin whisker mitigation,
urethane conformal coating,
urethane resin
Whenever a potential project that could benefit from a conformal coating application is discussed, the benefits of conformal coating need to be addressed. By looking at the benefits of each different coating, you can see which coating will be right for your project.WHAT IS CONFORMAL COATINGConformal coating is a protective non conductive dielectric layer that is applied to protect the assembly from damage due to contamination, salt spray, moisture, fungus, dust and corrosion caused by harsh or extreme environments. ARE THERE DIFFERENT TYPES OF CONFORMAL COATING?There are 5 different mediums for conformal coating:
- Parylene
- Acrylic Resin
- Urethane Resin
- Epoxy Resin
- Urethane Resin
WHAT ARE THE BENEFITS OF EACH TYPE OF CONFORMAL COATING?
Parylene possesses superior chemical barrier properties, are biochemically inert, and because of the deposition process can be applied uniformly to virtually any surface and shape including: glass, metal, paper, resin, plastics, ceramics, ferrite and silicon.
Acrylic conformal coatings are easily applied. They dry to the touch at room temperature in minutes, have desirable electrical and physical properties, and are fungus resistant.
Epoxy systems are usually available as “two-component” compounds. These rugged conformal coatings provide good humidity resistance and high abrasion and chemical resistance.
As a group, all provide excellent humidity and chemical resistance plus outstanding dielectric properties for extended periods.
Silicone conformal coatings are particularly useful for high temperature service, up to about 200 deg. C. They provide high humidity and corrosion resistance along with good thermal endurance.
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parylene conformal coating,
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silicone conformal coating,
urethane conformal coating,
epoxy conformal coating
