Parylene Coating Blog by Diamond-MT

Parylene and Hydrofluoric Acid

Posted by Sean Horn on Fri, Sep 18, 2020 @ 08:00 AM

Parylene is a chemically inert conformal coating [1]. It has a well-established chemical vapor deposition process and patterning methods. It is a great candidate for use in various application areas (health, aerospace, oil and gas, microelectronics, and so on.) due to its mechanical, physical, optical and chemical properties. Parylene is known to withstand highly corrosive environments and it can be utilized as a barrier material against various etchants in different processes (e.g. Hydrofluoric acid (HF), nitric acid, and acetic acid; potassium hydroxide; and tetramethylammonium hydroxide).

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Tags: parylene, parylene properties, medical parylene

What Types of Materials can be Parylene Coated?

Posted by Sean Horn on Fri, May 29, 2020 @ 08:00 AM

At Diamond MT we often get the question: “Can my xxx be parylene coated?”  The number of substrate surfaces that can be coated with parylene is plenty. In the table below a number of industrial applications that using Parylene conformal coatings are listed. The examples can be extended.

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Tags: parylene, parylene conformal coating, parylene applications

How Long Will Parylene Coating Last?

Posted by Sean Horn on Fri, May 22, 2020 @ 08:00 AM

The stability and insulation property of Parylene conformal coating is critical for the reliable operation of electronic devices throughout their lifetime (PCBs, MEMS, sensors, implants and so on.). The failure mechanism of the conformal coating layers is known to be due to pore formation, blistering, delamination and thinning or pinhole formation due to dielectric breakage of the coating over time [1], [2]. Therefore, the surface where the interface between the conformal coating and the substrate will be formed is of high importance. The cleanliness of this surface has a great impact on the final results of the conformal coating process and the coatings durability. At Diamond MT we provide professional surface cleaning services ensuring the long lasting results for your components. Also, the parylene conformal coating thickness and parylene varieties required for different service are considerations to take into account. We offer our professional services to direct our customers. Some of the variables of different service conditions can be listed as:

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Tags: parylene conformal coating, parylene coating process, parylene properties

How Can You Validate Parylene Coverage?

Posted by Sean Horn on Fri, May 15, 2020 @ 08:00 AM

Parylene XY is a transparent, thin (hundreds of nanometers to a few micrometers), well adhering, pin-hole and defect free conformal coating. They are coated uniformly on flat surfaces and component configurations with sharp edges, points, flat surfaces, crevices or exposed internal surfaces are coated uniformly without voids.

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Tags: parylene, conformal coating inspection, parylene inpsection

Conformal Coatings for Oil & Gas Sensors

Posted by Sean Horn on Fri, May 08, 2020 @ 08:00 AM

Oil & Gas industry makes use of sensors which face extremely high temperature and high pressure (HTHP) environments as in downhole drilling (>200°C and 30 kspi). In US natural gas supply lie in reservoirs below 15,000 ft. Wells at these depths pose environmental challenges of drilling due to the temperature, pressure and gasses. Increasing the lifetime of drilling equipment and possibility for recalibration of sensors that drift at such depths would save millions of dollars if they can be preserved under these HTHP environments. The packaging of sensors is a key element in providing this kind of protection.

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Tags: parylene, conformal coating applications, oil and gas, polyurethane conformal coatings

What Happens to Parylene when the Dielectric Voltage is Exceeded?

Posted by Sean Horn on Fri, Apr 24, 2020 @ 08:00 AM

Poly(para-xylylene) derivatives (parylenes) are used as conformal coatings in a wide range of applications in the automotive, medical, electronics, military and semiconductor industries. They are inert, transparent and have excellent barrier properties as dielectric thin films. Because their deposition takes placeunder vacuum sub-micron range crevices can be coated leading to excellent barrier properties (void free) and they have extraordinary purity that is of great importance in electronic applications. Not all parylene derivatives show same dielectric properties (Table 1). It is also important to note that dielectric properties of parylenes depend on their thickness thus their %crystallinity which is explained below.

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Tags: parylene conformal coating, parylene process, parylene properties

Can I Spray Parylene Myself?

Posted by Sean Horn on Fri, Apr 17, 2020 @ 08:00 AM

The answer is “No!”

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Tags: parylene conformal coating, parylene coating process, parylene properties

5 Keys to Parylene Process

Posted by Sean Horn on Fri, Apr 10, 2020 @ 08:00 AM

Parylene Process:

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Tags: parylene, parylene coating process, parylene process, parylene inpsection

Low Outgassing Conformal Coatings

Posted by Sean Horn on Fri, Apr 03, 2020 @ 08:00 AM

Hermeticity and Outgassing:

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Tags: NASA conformal coating, NASA-STD 8739.1A, low outgassing conformal coatings

Why does the parylene process take so long?

Posted by Sean Horn on Fri, Mar 06, 2020 @ 01:38 PM

Parylene is a transparent polymer that offers uniform and pinhole-free conformal coatings for printed circuit boards, medical devices, and microelectronics. Varieties of parylene are made available through a modification of the molecular structure of para-xylylene (Parylene N, C, D, and F-AF4, and F-VT4). Each modification results in a set of material properties that are applicable in different service conditions.

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Tags: parylene, parylene coating process, parylene process