Overview
Parylene N is a linear, crystalline polymer belonging to the poly-para-xylylene family, first developed in 1965 by Union Carbide. It is deposited as a pinhole-free conformal coating via chemical vapor deposition (CVD) at room temperature, enabling ultra-thin (0.1–50 μm) protective layers. Unlike other Parylene types, it exhibits the lowest dielectric constant (2.65) and highest penetration into small crevices, making it ideal for delicate electronic components. As a USP Class VI and ISO 10993-certified material, Parylene N meets stringent biocompatibility requirements for implantable medical devices. Its unique polymerization process allows coating of complex geometries without liquid phase formation, distinguishing it from spray or dip coatings.
Physical and Chemical Properties
Parylene N demonstrates exceptional thermal stability with continuous service up to 80°C and short-term resistance to 125°C. Its tensile strength (45–70 MPa) and elongation at break (200%) surpass many engineering plastics. The material's moisture absorption rate (<0.1%) is among the lowest of any polymer, ensuring long-term performance in humid environments. Chemically, Parylene N resists acids, alkalis, and solvents including IPA and DMSO. However, it is susceptible to oxidative degradation above 100°C in air. Its UV transparency (90% at 400–700 nm) enables optical applications, though prolonged UV exposure requires stabilizers. The coefficient of friction (0.29) facilitates insertion of coated medical components.
Main Applications
In electronics, Parylene N protects printed circuit boards (PCBs), MEMS devices, and sensors from moisture, ionic contamination, and dendritic growth. Its uniform thickness control (±5%) is critical for high-frequency RF components where dielectric consistency impacts signal integrity. The aerospace industry uses it for conformal coating of avionics and satellite components due to outgassing levels meeting NASA ASTM E595 standards. Medical applications include coatings for pacemaker leads, neural probes, and surgical tools, where its FDA-approved biocompatibility prevents tissue rejection. Emerging uses include lithium-ion battery electrode coatings (2–5 μm) to prevent electrolyte decomposition while maintaining ionic conductivity.
Safety and Storage
While Parylene N itself is non-toxic, its precursor (dimer) requires handling in controlled environments due to pyrophoric risks during vaporization (typically at 150°C). Deposition chambers should maintain <1 mbar pressure with nitrogen purging capabilities. Finished coatings pose minimal risk but should be processed in well-ventilated areas during laser trimming or mechanical removal. Raw dimer storage demands moisture-proof containers at <25°C with desiccants. Shelf life typically exceeds 24 months when sealed under argon. Waste disposal follows local regulations for halogenated polymers, though incineration is discouraged due to potential dioxin formation above 800°C.
B2B Procurement Guide
Industrial buyers should specify dimer purity (>99.5%), as impurities like chlorine residues affect deposition quality. Key procurement metrics include coating uniformity (measured by ellipsometry) and adhesion strength (ASTM D3359). For medical applications, request USP Class VI or ISO 10993-5 cytotoxicity test reports. Leading suppliers include Specialty Coating Systems (SCS), Para Tech Coating, and KISCO. Minimum order quantities typically start at 1kg of dimer, sufficient for coating 50–100 m² at 10μm thickness. Consider turnkey coating services for prototypes, with lead times of 2–4 weeks. Pricing tiers apply at 5kg, 25kg, and bulk 100kg+ orders.
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