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How does Parylene material differ from liquid conformal coatings and where can you buy it?

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Parylene is very different to typical liquid conformal coatings like acrylic, epoxy, silicone and polyurethane resin based materials.

When you buy Parylene it is a white powdered dimer.

This powder cannot be applied to circuit boards in its current state. The dimer requires specialist Parylene equipment that uses a Chemical Vapour Deposition (CVD) process. That is the dimer is placed inside the machine, a vacuum created and the dimer is then transformed to a gas vapour by being heated up.

This vapour created during the pyrolysis process can then be deposited on the printed circuit board as the Parylene coating.

This is very different to liquid conformal coatings. They start off as a “varnish” in a can or container and are applied to circuit boards by brushing, dipping or spraying. They then dry either naturally or artificially in some manner and the circuit board is now protected.


Where to buy Parylene

When purchasing Parylene it is important to find a source that provides a quality product. The purity of the coating is one of the key points in creating a successful Parylene process. Neglecting this fact can cause endless problems.

Remember that buying Parylene cheaply is easy. Buying cheap Parylene that is pure enough to protect the circuit board is another issue.

Thin film Partners can inform you of the right vendors who supply high-quality material and the pricing for each type. Then you can compare which vendor you would like to buy from.

This is a cost effective method to ensure you get the right Parylene coating at the right price.


Want to find out more about Parylene?

Contact us to discuss your needs and let us explain how we can help you.

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Five key facts about Parylene when protecting printed circuit board assemblies

  1. The Parylene conformal coating process is a very specialised vapour deposition application method using specialist vacuum chamber systems. This differs significantly to all of the other liquid conformal coatings available on the market that are applied by spraying, brushing and dipping.
  2. Parylene coating is completely conformal and uniform to the surface of the Printed Circuit Board (PCB) or product. It is also pinhole free. Therefore, components with sharp edges, points, flat surfaces, crevices or exposed internal surfaces are coated uniformly without voids.
  3. Parylene coating provides an excellent moisture and gas barrier due its very low permeability. This means that electronics circuit boards coated in Parylene generally are more “waterproof” than the same electronics coated in a liquid conformal coating.
  4. Parylene is unaffected by solvents (it has very high chemical resistance) and is very effective against salt attack.
  5. Parylene has excellent electrical properties. This includes having low dielectric constant and loss with good high-frequency properties, good dielectric strength, and high bulk and surface resistance.

Want to find out more about Parylene?

Contact us to discuss your needs and let us explain how we can help you.

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Why use Parylene conformal coating?

parylene-system-in-operation-400

The Parylene conformal coating process is a specialised vapour deposition application process using specialist systems differing significantly to all of the other liquid conformal coatings available on the market.

This difference leads to many unique advantages:

  • Parylene coatings are completely conformal to the surface of the Printed Circuit Board (PCB) or product. This means that the coating has a uniform thickness and is pinhole free. As a result, component configurations with sharp edges, points, flat surfaces, crevices or exposed internal surfaces are coated uniformly without voids.
  • Parylene coating provides an excellent barrier that exhibits a very low permeability to moisture and gases. This means that products coating in parylene generally are more “waterproof” than the same products coated in a liquid conformal coating.
  • Parylene is unaffected by solvents, has low bulk permeability and is hydrophobic. Coatings easily pass a 100hr salt-spray test.
  • Parylene has excellent electrical properties. These include low dielectric constant and loss with good high-frequency properties, good dielectric strength, and high bulk and surface resistance
  • Parylene is transparent and can be used to coat optical elements.No initiators or catalysts are involved in the polymerization so the coating is very pure and free from trace ionic impurities.
  • Parylene is unique in being created directly on the surface at room temperature. Room temperature formation means the conformal coating and the parts are effectively stress-free.
  • Parylene coating completely penetrates spaces as narrow 0.01mm (10 microns)
  • Parylene is chemically and biologically inert and stable and make excellent barrier material.
  • Parylene has good thermal endurance: Parylene C performs in air without significant loss of physical properties for 10 years at 80°C and in the absence of oxygen to temperatures in excess of 200°C.
  • FDA approval of parylene-coated devices is well-documented. The coatings comply with USP Class VI Plastics requirements and are MIL-I-46058C / IPC-CC-830B listed.

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10 Reasons To Use Parylene Coating for Circuit Board Protection

  1. True Conformal Coating. Parylene coating is completely conformal to the surface of the Circuit Board. This means that the coating has a uniform thickness and is pinhole free.
  2. Very Low Permeability. Parylene coating provides an excellent barrier that exhibits a very low permeability to moisture and gases. This means that products coating in parylene generally are more “waterproof” than the same products coated in a liquid conformal coating.
  3. Solvent Protection. Parylene is unaffected by solvents, has low bulk permeability and is hydrophobic.
  4. Salt Protection. Coatings easily pass a 100hr salt-spray test due to the homogeneous coating.
  5. Parylene has excellent electrical properties. These include low dielectric constant and loss with good high-frequency properties, good dielectric strength, and high bulk and surface resistance.
  6. 100% Clarity. Parylene is transparent and can be used to coat optical elements.
  7. Room Temperature Deposition. Parylene is unique in being created directly on the surface at room temperature. Room temperature formation means the conformal coating and the parts are effectively stress-free.
  8. Inert in nature. Parylene is chemically and biologically inert and stable and make excellent barrier material.
  9. Excellent Penetration. Parylene coating completely penetrates spaces as narrow 0.01mm (10 microns)
  10. Good Thermal Properties. Parylene has good thermal endurance. Parylene C performs in air without significant loss of physical properties for 10 years at 80°C and in the absence of oxygen to temperatures in excess of 200°C.

To find out more click Parylene Application Process

SCH provide Parylene Machines from Paratronix. SCH also offer Conformal Coating Materials, Equipment, Services, Training and Consultancy.

SCH Technologies: Conformal Coating Solutions made easy…

Contact Us Now:

  • Tel: +44 1226 249109,
  • Contact our distributors
  • Email us : Sales@scshervices.com
  • Use our website: conformalcoating.co.uk

 

 

Why is Parylene used for waterproofing circuit boards?

Parylene is a completely homogeneous coating. That means it is the same thickness all over the circuit.

This is achieved by the coating being applied as a vapour and the coating condensing onto the circuit board uniformly.

This uniformity of coating means that the water cannot easily come into contact with the circuit and cause shorts.

To find out more click Parylene Application Process

SCH provide Parylene Machines from Paratronix. SCH also offer Conformal Coating Materials, Equipment, Services, Training and Consultancy.

SCH Technologies: Conformal Coating Solutions made easy…

Contact Us Now:

  • Tel: +44 1226 249109,
  • Contact our distributors
  • Email us : Sales@scshervices.com
  • Use our website: conformalcoating.co.uk

Ten Reasons to use Parylene Conformal Coatings on your Circuit Boards

  1. Parylene coatings are completely conformal to the surface of the PCB. This means that they have a uniform thickness and are pinhole free. As a result, component configurations with sharp edges, points, flat surfaces, crevices or exposed internal surfaces are coated uniformly without voids. This provides the best protection possible, can make the circuit board “waterproof” and is impossible to achieve with liquid conformal coatings.
  2. Parylene coatings are chemically and biologically inert and stable and make excellent barrier materials.
  3. Parylene conformal coating has excellent electrical properties: low dielectric constant and loss with good high-frequency properties; good dielectric strength; and high bulk and surface resistance.
  4. Parylene is completely transparent and can be used to coat optical elements like LEDs without changing the properties of the device.
  5. Parylene complies with USP Class VI Plastics requirements
  6. Parylene conformal coating is both MIL-I- 46058C and IPC-CC-830B listed.
  7. Parylene has achieved FDA approval of when used on devices and is well-documented.
  8. Parylene has good thermal endurance: Parylene C performs in air without significant loss of physical properties for 10 years at 80°C and in the absence of oxygen to temperatures in excess of 200°C
  9. Parylene coating completely penetrates spaces as narrow 0.01mm (10 microns)giving you a complete coverage of a circuit board.
  10. Parylene is unique in being created directly on the surface at room temperature. Room temperature formation means the conformal coating and the parts are effectively stress-free.

For further information on Parylene Coatings click

Or, contact us here at +44 1226 249019 or email sales@schservices.com

Masking for the Parylene Application Process. Why is it important?

The goal of parylene is to protect the product from the environment in which it is wherever it is. This applies to all whether they are medical devices, printed circuit boards (PCB) or LEDs. However, the actual parylene material can cause failures of the product if it gets in the wrong place. In fact, masking the product for the parylene coating process is one of the most critical stages.

Why can Parylene cause failures in the product?

Some of the parylene’s properties can be a problem depending on where the conformal coating is applied. For example, parylene is an excellent dielectric which means it is a poor conductor of electricity. Therefore, if the connector contacts on the PCB are coated then may not work. Also, moving parts if coated will also be compromised and freeing the component could damage the coating itself.

Therefore, parylene masking solves this problem by allowing the board to be selectively coated in order to gain the benefits of parylene without destroying the product in the process.

The Parylene Masking ProcessCompletely masked PCB ready for conformal coating 3 close up

Although the masking process in the parylene coating is one of the most time-consuming and labour-intensive steps in the parylene conformal coating process it is also one of the most important. Improper or poor parylene masking, after all, can compromise the coating or cause failure of the finished part.

To ensure the process is completed correctly it is important to clearly identify the areas of the product that should not be coated during parylene deposition. Once this is done, the conformal coating masking materials can be applied to the areas that must not be coated.

After the masking stage, the product is placed into the vacuum chamber for parylene deposition. During this stage of the process, parylene vapour completely coats the entire product, covering any surface of the substrate that is exposed to air. On the masked areas, however, the parylene is deposited on the masking materials instead of on the actual substrate. The masking material is then removed when the product is dry, taking the parylene coating with it.

Depositing and masking parylene conformal coating is a complicated process with many variables and challenges. But when performed correctly, parylene coating offers a degree of protection and performance that few other types of conformal coatings can match.

Click Parylene Coating Machines or Parylene Coating Services for further information or Contact Us now to discuss your Parylene needs.