Parylene Coating
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HZO produces pinhole-free and ultra-thin Parylene coatings for electronics within drones and robotics, providing exceptional dielectric strength and superior resistance to chemicals and corrosion.
Parylene coatings‘ superior moisture impermeability ensures complete coverage, even on complex substrates. These advantages stem from Parylene’s chemical deposition process and material characteristics.
On the HZO resource page ‘Parylene Coating Properties: Tables of Values, Types, & Technical Data Sheets’ the parylene coatings specialists take an in-depth look at the electrical, mechanical, optical, thermal, and corrosion resistance properties of parylene coatings.
There is also a detailed explaination of parylene types:
Parylene coatings come in several types, including Parylene C, N, and F (VT-4) and high-purity. No sodium, ammonium, or chloride ions are generated from or inherent in the coatings.
Parylene N is purely a hydrocarbon polymer. Parylene C is identical to N except for chlorine atoms covalently bonded along the polymer chain. However, these chlorine atoms are not easily ionized or ionic.
Fluorinated dimers like VT-4 offer greater UV and thermal resistance than N and C, but are costlier to manufacture. VT-4’s CF2 groups replace CH2 connections, increasing oxidation resistance.
Parylene starting materials polymerize through free radical addition, producing no reaction byproducts.
Types of Parylene Compared
Parylene C Properties
Both Parylenes C and VT-4 contain flame-retardant halogens (chlorine and fluorine), and so these materials self-extinguish almost immediately after a flame is removed. UL 94 HB and UL 94 V tests assess flammability.
Parylene F Properties
Parylene F (VT-4) is free from bromine and chlorine halogens and contains fluorine. It exhibits the highest resistance to heat and UV when compared to C and N.
Parylene N Properties
Halogen-free Parylene N offers unique dielectric properties with a low, frequency-stable dissipation factor.
