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Polyurethane (UR) Conformal Coatings

MG Chemicals offers a polyurethane conformal coating product which provides enhanced PCB protection from harmful solvents and corrosive gases compared to other coating chemistries. This 1-part coating is certified to both the UL 746E and IPC CC 830 standards for conformal coatings and is available in both liquid and aerosol formats.

We also offer acrylic, silicone, and UV conformal coatings.

 

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Polyurethane Conformal Coatings
4223F – Urethane Conformal Coating

4223F – Urethane Conformal Coating

4223F is a 1-part, heat curing, UL 746E and IPC-CC-830B certified, thermoset urethane (UR) conformal coating. It cures to a durable, flexible, scratch resistant and smooth finish. It is easy to apply and can be handled in 15 minutes. It cures in only 2 hours at 100 °C (212 °F). It may be removed with appropriate strippers, or soldered through for repair or rework.

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4223F – Urethane Conformal Coating

4223F – Urethane Conformal Coating

4223F is a 1-part, heat curing, UL 746E and IPC-CC-830B certified, thermoset urethane (UR) conformal coating. It cures to a durable, flexible, scratch resistant and smooth finish. It is easy to apply and can be handled in 15 minutes. It cures in only 2 hours at 100 °C (212 °F). It may be removed with appropriate strippers, or soldered through for repair or rework.

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  • Certified UL and IPC – UL746E and IPC-CC-830 certified
  • Withstands harsh environments – Includes salt fog, hydrogen sulfide and mild chemicals
  • Electrically insulating – Allows for miniaturization
  • Easy to inspect – Contains UV trace to inspect coverage
  • PCBs in marine electronics – holds up well against salt fog
  • Dielectric barrier of high-voltage parts – Insulates between traces, preventing arcing
  • Farm equipment – Resists fungal attack

The coating is dispensing as white strands

This is a known phenomenon called cobb webbing or spider webbing. Here, the polymer is essentially drying as it’s dispensed resulting in strands. There are a few things you can do to correct this. The first is to lower the pressure of the spray gun. You can also add more solvent to the coating mixture. A third consideration is the relative humidity in the room where application is occurring which ideally is 30-60% R.H.

Why is applying 1 heavy coat not recommended?

Applying a single, heavy coat can lead to solvent entrapment and under curing of the film. Here, the surface hardens and entraps solvent within the bulk often leading to a tacky surface. To achieve thicker coats, apply multiple thin coats instead.
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What is the chemical resistance of polyurethane?

Cured polyurethane holds up well to aqueous chemicals like acids and bases but also holds up well to mild chemical solvents like oils, and alcohols. Strong chemicals like acetone and toluene will break down polyurethane shortly after exposure.

How can I measure dry film thickness?

There are different tools available to measure the dry film thickness. The easiest is the micrometer where the applicator can simply measure substrate thickness before and after coating with the difference being the dry film thickness. If the underlying substrate is electrically conductive, you can use a Positector which is a non-destructive test method.

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