What Is Air Permeability?
Direct Answer
Air permeability is how easily air passes through a nonwoven or film, indicating breathability that reduces heat and moisture buildup in diapers and pads.
Key Takeaways
- Air permeability is how easily air passes through a nonwoven or film, indicating breathability that reduces heat and moisture buildup in diapers and pads.
- How it works: Air permeability measures the air volume passing through a material per time/area under pressure difference.
- Breathable backsheets show high air permeability while blocking liquid
- Myth: Air permeability equals WVTR. Air flow and vapor transmission are related but measured differently
How Air Permeability Works
Air permeability measures the air volume passing through a material per time/area under pressure difference. Higher values mean better airflow, helping keep skin cooler and drier. Breathable backsheets combine air permeability with liquid barrier. It complements WVTR (vapor transmission) in breathability assessment.
Examples and Applications
- Breathable backsheets show high air permeability while blocking liquid
- Air permeability testing measures airflow through the material
Air Permeability vs. Related Terms
| Term | What it is | Key difference |
|---|---|---|
| WVTR | Air Permeability | WVTR measures water vapor passage; air permeability measures air flow — both indicate breathability |
Limitations and Common Misconceptions
- Myth: Air permeability equals WVTR. Air flow and vapor transmission are related but measured differently
- Myth: Higher is always better. It must balance with liquid barrier and strength
What is air permeability?
How easily air passes through a material, indicating breathability that keeps skin cooler.
How is it measured?
By measuring air volume passing through per area and time under a pressure difference.
References
- Pampers Official - What's in a Pampers diaper (component materials) — 品牌官方 (accessed 2026-08-02)
- JP CIA (industry) - Baby diaper material: key components and their functions — 行业媒体 (accessed 2026-08-02)