While conformal coatings increase the lifetime of electronic devices by providing a thin barrier that strengthens their ability to withstand harsh environmental conditions, adhesives and encapsulants provide a significantly higher level of protection on the entire assembly.

The most common properties of adhesives and encapsulants include:

• creating environmental seals that protect against moisture and corrosion,
• providing high-temperature resistance,
• increasing shock and vibration dampening,
• generating strong bonds to a variety of substrates,
• maintaining low shrinkage, and
• offering thermal conductivity.

HumiSeal adhesives and encapsulants are available as 1K or 2K compounds with medium to high viscosity. They can be used in the following processes:

• A- bonding/staking

Used for the purpose of joining or securing a component in order to increase shock and vibration resistance by releasing the strain from the solder joints.

Also read: How Best to Protect PCB Mounted Components from Vibration 

• B- potting or casting

Involves a case filled with liquid potting material to completely cover the device and the components. In casting, a temporary frame is used.

Also read: 5 Simple Steps to Eliminate Bubbles in Potting Encapsulants

• C- encapsulation/dam and fill

Utilized to enclose, without the use of a case or frame, small areas of the assembly to address critical components that require a high level of protection.

Pros and Cons of Different Encapsulation and Adhesive Application Methods

The following offers a wide range of application methods, such as

1. Manual application with 1- or 2-part dispensing guns advantages easy access in tight areas quick change of syringe, mixer, and needle disadvantages operator dependent poor control of the dispensed quantity

2. Semi-automated dispensing systems for 1- or 2-part materials advantages easy access in tight areas quick change of syringe, mixer, and needle good control of the quantity dispensed pressure regulator and time-dispensing control disadvantage operator dependent

Also read: 4 Tips to Successfully Apply Two-Component Epoxy Adhesives

3. Automated benchtop robots  advantages programmable superior control of the dispensed quantity high throughput adaptive for 1- and 2-part syringes or bulk disadvantages limited working area cannot be integrated into conveyorized inline process

4. Fully automated dispensing systems advantages PC integrated software for programming progressive pumps and vacuum control available for accurate bubble-free dispensing configurable for 1- and 2-part syringes or bulk bigger working area weight check and needle calibration conveyorized integration with existing inline process disadvantage high cost

HumiSeal’s wide range of adhesives and encapsulants allows you to increase the level of protection of the entire assembly or specific components, regardless of the application method chosen.

If you have questions, you can always contact us.

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