What is Parylene C?
What is Parylene C?
Parylene C, the second commercially available member of the Parylene series, is produced from the same raw material (dimer) as Parylene N, modified only by the substitution of a chlorine atom for one of the aromatic hydrogens.
How is parylene coating applied?
Parylene coatings are applied at ambient temperatures with specialized vacuum deposition equipment. A solid, granular raw material, called dimer, is heated under under vacuum and vaporized into a dimeric gas. The gas is then pyrolized to cleave the dimer to its monomeric form.
Is parylene gas permeable?
Gas permeability is a material property that defines the penetration of a gas through a solid membrane. Compared to epoxies, urethanes and silicones, parylene has considerably better gas permeability.
What is parylene used for?
Parylene serves multiple purposes including electrical insulation, moisture and chemical isolation, mechanical protection, enhanced lubricity, and surface consolidation to avert flaking or dusting.
Is parylene coating expensive?
A typical Parylene coating run uses about a pound of raw Parylene, which costs anywhere from $200 to $5,000 per pound.
How long does parylene coating take?
Parylene coating is applied through a vapor deposition process onto the substrate or material that is being coated. Depending on the coating type and required thickness, typical parylene deposition rates are about . 2/mils per hour, so machine runs can vary from as little as 1 hour to over 24 hours.
Is Parylene conductive?
Benefits of Parylene Coating Electrical insulation with low dielectric constancy and high tension strain, plus a reliable barrier against acids, caustic solutions, and water vapor. Non-conductive qualities that eliminate electrostatic, magnetic or radio frequency interference during operation.
What type of material is parylene?
Parylene is the generic name for the poly-para-xylylenes. These materials form linear, highly-crystalline polymers but can be usefully produced only as coatings and films. The most commonly used is Parylene C, the mono-chloro substituted compound.
What is parylene coating used for?
Coatings of parylene are often applied to electronic circuits and other equipment as electrical insulation, moisture barriers, or protection against corrosion and chemical attack. They are also used to reduce friction, and in medicine to prevent adverse reactions to implanted devices.
What polymer is parylene?
poly-para-xylylenes
Parylene is the generic name for the poly-para-xylylenes. These materials form linear, highly-crystalline polymers but can be usefully produced only as coatings and films. The most commonly used is Parylene C, the mono-chloro substituted compound.
Is Parylene a polymer?
Parylene is considered a “green” polymer because its polymerization needs no initiator or other chemicals to terminate the chain; and the coatings can be applied at or near room temperature, without any solvent.
What type of material is Parylene?
What are the thermal properties of parylene N and C?
Based on an Arrhenius extrapolation of these data, the temperature for 100,000 hours’ endurance is 106ºC in the case of Parylenes N and C, and 134ºC in the case of Parylene D. In inert atmospheres, the temperature for 100,000 hours endurance is greater than 200ºC for all three Parylenes.
What kind of insulation is parylene used for?
Parylene is a material with exceptional electrical insulation properties that is applied as a conformal thin film. This unique combination allows parylene to be used as a precision dielectric layer in a variety of applications.
Why does parylene have a high dielectric strength?
When compared to epoxy, silicones and urethane coatings, all parylene types have an extremely high dielectric strength. Parylene N is a unique dielectric material because of the extremely low dissipation factor which changes only slightly with frequency.
How long does parylene C last in the air?
Based on extrapolation of test data, Parylene C is expected to survive continuous exposure to air at 100ºC for ten years (100,000 hr.). In oxygen-free atmospheres, it is expected to survive the period at 220ºC.