1)Parylene provide environmental and dielectric in medical substrates, electronic circuits 2)There is parylene C,D,N powder

Poly-para-xylylene Versions There are three common forms of the Parylene polymer:Parylene C, Parylene N, and Parylene D, each with unique properties that suit it to particular insulation applications. For example, Parylene N provides particularly high dielectric strength and a dielectric constant that is independent of frequency.Because of its high molecular activity in the monomer state, Parylene N has the highest penetrating power of the Parylenes, with the ability to coat deep recesses and blind holes.Parylene N has a very low dissipation factor, a low dielectric constant, and is ideal for high frequency applications where the coating is in the direct RF field.Unlike liquid coatings, the Parylene deposition process does not entrap air that can lead to high frequency corona problems.Parylene C has a chlorine atom on the benzene ring, and this results in modified electrical and physical properties including very low permeability to moisture and corrosive gases.The Parylene C deposition rate is substantially faster than that of Parylene N, resulting in reduced crevice penetration ability.Parylene D, with two chlorine atoms on the benzene ring, has the highest degree of thermal stability of the Parylenes and also possesses superior physical and electrical properties at high temperatures compared to Parylenes C and N.The bulk electrical properties of the Parylenes make them good candidates for electrical and electronic applications. Dielectric constants and dielectric losses are low and unaffected by absorption of moisture, and the polymer's high purity, low moisture absorption and freedom from trace ionic impurities yield high bulk resistivities.

Parylene C