Parylene Coating Blog by Diamond-MT

Polyurethane Conformal Coatings: When to consider an alternative

Posted by Sean Horn on Fri, Feb 07, 2020 @ 09:05 AM

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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Tags: tin whiskers, urethane conformal coating, urethane resin, polyurethane conformal coatings

When to Use Urethane Conformal Coating

Posted by Sean Horn on Tue, May 08, 2012 @ 06:46 AM

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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Tags: parylene conformal coating, conformal coating, conformal coatings, tin whiskers, tin whisker mitigation, urethane conformal coating, urethane resin

Tin Whisker Mitigation and Conformal Coating

Posted by Sean Horn on Tue, Apr 10, 2012 @ 09:35 AM


 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.  Tin whiskers typically grow from lengths of 1-2 millimeters (mm) but have been observed to lengths in excess of 10 mm.  Electronic system failures have been attributed to short circuits caused by tin whiskers that bridge closely-spaced circuit elements maintained at different electrical potentials.

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Tags: Diamond-MT, conformal coating, tin whiskers, tin whisker mitigation, urethane resin