---
title: Barrier Properties of Parylene
description: This barrier properties table shows a list of the permeability characteristics of the Parylenes and compares other types of conformal coatings.
---

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# Barrier Properties

Due to the physical properties of Parylene and the method of deposition, Parylene forms a pinhole-free film on the subject substrate. Therefore, it provides an excellent barrier to both liquids and gasses. The table below lists the permeability characteristics of the Parylenes C and N.

Moisture vapor permeability values have been measured at thickness below 0.1 micron. Normalized to equivalent thickness, the values are the same for all thicknesses. Assuming that Parylene C at 0.001 inch is pinhole free, then Parylene C films at 0.1 micron (~ x 10-6 inch) are also pinhole free.

| **POLYMER**  | **GAS PERMEABILITY** **cm3 - mil/100 in2 - 24 hr - atm (23°C) ** | **MOISTURE VAPOR TRANSMISSION** **g - mil/100 in2 - 24 hr - 37°C - 90% RH** |  |  |  |
| --- | --- | --- | --- | --- | --- |
| ** ** | **N2** | **O2** | **CO2** | **H2S** | ** ** |
| **Parylene C** | 0.95 | 7.1 | 7.7 | 13 | 0.50 |
|  **Parylene N** | 7.7 | 30 | 214 | 795 |  1.50 |

 

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