All gases, such as oxygen, moisture, carbon dioxide, and nitrogen, can diffuse through walls of just about all hoses and plastics. Permeation is absent only in all metal all welded pipes. All gases, such as oxygen, moisture, carbon dioxide, and nitrogen, can diffuse through walls of just about all hoses and plastics. Permeation is absent only in all metal all welded pipes.

Permeation is Primarily Dependent Upon:

1. Exposed Surface Area: The longer the hose or the bigger the hose OD, the greater the permeation.

2. Length of Diffusion Path: The longer the path to diffuse, the less the permeation. Thick walled hoses are preferable.

3. Material of Construction: Most important criteria.

4. Nature of Containment: Except for Teflon and polypropylene, most plastics allow a much bigger degree of moisture permeation than oxygen permeation.

5. Temperature & Humidity: The higher the humidity, the greater the moisture permeation. Also, the moisture permeation rate is Higher at higher temperatures but at the same relative humidity. E.g. Moisture permeation at 95° F is approximately double than at 75° F

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