PVA Pro Tip #7: Smart Strategies for Optimal Conformal Coating – Frequently Asked Questions
Smart Strategies for Optimal Conformal Coating Thickness
Applying the right amount of conformal coating is key to balancing protection, performance, and cost-efficiency. Below, we answer frequently asked questions to help you apply coatings with precision and avoid common pitfalls.
Q: Is it generally better to apply a thicker layer of conformal coating for better protection?
Not necessarily. Applying excessive conformal coating can lead to issues such as cracking, increased weight (added mass), and higher production costs.
Q: What is a typical dry film thickness range for solvent-based acrylic or urethane conformal coatings?
For solvent-based acrylic or urethane coatings, an average dry film thickness is typically between 25 and 75 microns.
Q: What is a typical dry film thickness range for solvent-less or UV cure conformal coatings?
Solvent-less coatings or UV cure products generally aim for a dry film thickness in the range of 75 to 200 microns.
Q: How can I check the thickness of the conformal coating before it’s fully cured and in mass production?
You can perform a thickness check prior to production using a wet film gauge.
Q: How do you use a wet film gauge to measure conformal coating thickness?
To use a wet film gauge, place it directly onto a flat area of the freshly coated substrate. The notches on the gauge will indicate the thickness of the wet coating.
Q: What are some other methods for measuring the thickness of conformal coatings?
More precise measurements can be obtained using laser, ultrasonic, or eddy current meters.
Q: What is a potential limitation of using laser, ultrasonic, or eddy current meters for thickness measurement?
These methods may require the conformal coating to be fully cured before an accurate measurement can be taken.
