Parylene Dimers Hub
Parylene Dimers & Chemistry
This hub brings together SCH’s complete set of Parylene dimer guides — covering Parylene N, C, D and fluorinated AF-4 dimers. These purified precursors define every Parylene coating’s performance. Explore how molecular structure, purity and substitution (chlorine or fluorine) alter dielectric strength, barrier protection and thermal limits. Learn how to select the correct dimer for your reliability, environmental or regulatory requirements in aerospace, medical, and high-performance electronics.
Each guide explains a different aspect of Parylene dimer chemistry and application — from the fundamental definition to performance comparison, purity effects, and selection strategy.
Explore Parylene Dimer Guides
- What is Parylene Dimer? – Understand the chemistry, how it converts from solid to coating, and why purity matters.
- Parylene Dimer Comparison (N, C, D & AF-4) – Compare dielectric, thermal and barrier properties with a visual summary chart.
- How Dimer Purity Affects Coating Quality – See how impurities and handling impact adhesion, yield and appearance.
- Choosing the Right Dimer for Your Application – Match coating grade to your substrate, environment and performance targets.
Commercial pages: Parylene Dimer Products
What is Parylene Dimer?
Parylene dimer is the white, crystalline solid precursor that fuels the entire Parylene deposition process. Under vacuum, the dimer sublimates, cleaves to monomer gas, and polymerises into a uniform, pinhole-free coating. Our article explains the chemistry, processing steps and how dimer quality directly affects film properties and yield.
Parylene Dimer Comparison: N, C, D & AF-4
Each Parylene dimer exhibits unique characteristics. Parylene N offers the highest dielectric strength and deep penetration, Parylene C delivers outstanding moisture and chemical barrier properties, Parylene D adds high-temperature stability, and Parylene AF-4 provides extreme fluorinated performance for demanding aerospace and medical use. Our comparison chart highlights these differences across dielectric, barrier, chemical, and thermal metrics.
How Dimer Purity Affects Coating Quality
Purity defines the consistency, colour and adhesion of the final coating. Trace moisture, catalysts or oxidation residues can cause discolouration, poor yields or film defects. Our guide explains incoming inspection, storage and process control methods to maintain >99.5% purity and ensure repeatable high-reliability coatings.
Learn about purity and process control • Consulting & Process Optimisation
Choosing the Right Parylene Dimer
Selecting the correct dimer balances dielectric performance, moisture protection, thermal endurance and cost. Our short guide maps typical use cases to each type: Parylene N for best electrical insulation, C for general electronics, D for higher-temperature stability, and AF-4 for extreme environments. It also covers compatibility, shelf life and quality assurance tips.
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