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1. What is PE Film and How Does It Work?
Definition of PE Film
Polyethylene (PE) film is a plastic material made from polyethylene resin, known for its durability, flexibility, and moisture-resistant properties. In diapers, PE film is primarily used as a backsheet material, acting as the outermost layer that provides a waterproof barrier. Its versatility and protective capabilities make it a popular choice across industries like medical, packaging, and hygiene products.
Functionality in Diapers
In diapers, PE film functions as a moisture barrier, preventing liquid leaks while keeping the absorbent core intact. It also offers flexibility, allowing the diaper to conform to the wearer's body. Additionally, PE film maintains the diaper's shape and structure, ensuring the product performs well throughout use. The material's durability and flexibility contribute to the overall comfort of the diaper, making it lightweight and protective.
2. Breathable PE Film: Features and Benefits
Structure and Design
Breathable PE film incorporates a microporous structure created by adding inorganic fillers (such as calcium carbonate) to the PE resin and stretching the film during manufacturing. These micropores are approximately 0.01–10 microns in size—smaller than liquid water droplets (minimum ~20 microns) but larger than water vapor molecules (~0.0004 microns). This precise pore size allows water vapor to pass through while blocking liquid water, achieving both waterproofing and breathability simultaneously.
Advantages
- Enhanced Skin Comfort: The breathable nature of this PE film allows water vapor to escape from the diaper's microclimate, helping maintain a drier skin surface. Breathable backsheets are associated with lower skin hydration increase, which may contribute to reduced incidence of diaper rash.
- Water Vapor Transmission: Breathable PE film allows water vapor (not liquid) to pass through, reducing humidity buildup inside the diaper. Breathable backsheet samples demonstrate significantly higher water vapor permeability than non-breathable ones.
- Suitable for Extended Wear: By facilitating water vapor transmission, breathable PE film helps maintain a more comfortable microclimate during prolonged use.
Application in Diapers
Breathable PE film is commonly used in modern premium diaper designs to balance protection and comfort. It is frequently found in the backsheet layer, allowing manufacturers to create diapers that offer breathability without sacrificing leak protection. This type of material is suitable for diapers designed for babies or adults who need extended wear, providing comfort over prolonged periods while maintaining a slim profile.
3. Non-Breathable PE Film: Features and Benefits
Structure and Design
Non-breathable PE film is produced using a continuous, non-porous layer of polyethylene without the stretching process that creates micropores. This structure restricts the flow of water, air, and water vapor equally. It provides a reliable waterproof barrier but does not allow water vapor transmission.
Advantages
- Reliable Waterproof Barrier: Non-breathable PE film provides consistent protection against liquid leaks. Both breathable and non-breathable PE films are designed to be fully waterproof—the key difference lies in water vapor permeability, not liquid barrier performance.
- Cost-Effective Production: Due to its simpler manufacturing process (no filler addition or stretching required), non-breathable PE film can be more economical for budget-oriented products.
- Consistent Performance: The continuous structure offers uniform barrier properties without variability introduced by micropore distribution.
Application in Diapers
Non-breathable PE film is used in diaper types where basic leak protection at a lower cost is the primary consideration. It is suitable for short-term use products or markets where breathability is not a priority. However, for extended wear or sensitive skin applications, breathable alternatives are generally preferred.
4. Comparing Breathable vs. Non-Breathable PE Film
Performance Differences
| Parameter | Breathable PE Film | Non-Breathable PE Film |
|---|---|---|
| Waterproofing | Fully waterproof (blocks liquid water) | Fully waterproof (blocks liquid water) |
| Water Vapor Transmission | Significantly higher | Minimal to none |
| Air Permeability | Higher | None |
| Skin Hydration Impact | Typically lower | Typically higher |
| Manufacturing Complexity | Higher (requires fillers + stretching) | Lower (simple extrusion) |
| Typical Cost | Higher | Baseline |
Data represents typical industry ranges for illustrative purposes. Actual values vary by manufacturer and testing conditions.
Target Market Considerations
- Breathable PE Film: Preferred for premium baby diapers, sensitive skin products, and extended-wear adult incontinence products where skin health and comfort are priorities. Recommended for humid climates where moisture management is critical.
- Non-Breathable PE Film: Suitable for budget products, short-term use items, or markets where cost is the primary driver. May be used in products where extended wear comfort is less critical.
5. How to Choose the Right Backsheet Material for Your Brand
Understanding Your Brand's Needs
To select the right backsheet material for your brand, assess the specific needs of your target consumers:
- Comfort & Skin Health: If your target audience includes babies or individuals with sensitive skin, breathable PE film is recommended. Industry research suggests that breathable backsheets may help maintain a drier skin microclimate, potentially reducing the risk of skin irritation during extended wear.
- Budget-Conscious Markets: If your target market is highly price-sensitive, non-breathable PE film offers a cost-effective solution with equivalent liquid leak protection.
- Regulatory & Market Requirements: Some markets have guidelines recommending minimum breathability standards (e.g., ≥1,800 g/m²/24h WVTR) for infant care products. Ensure compliance with regional regulations.
Material Selection
- Breathable PE Film: Choose when comfort, potential skin health benefits, and premium positioning are primary concerns. The higher material cost is offset by improved user experience and market positioning.
- Non-Breathable PE Film: Choose when cost efficiency is the top priority and the target use case does not require extended wear comfort optimization.
Customization and Innovation
Brands can innovate in backsheet material design:
- Enhanced Breathability: Develop micropore designs that optimize water vapor transmission rates while maintaining mechanical strength.
- Eco-friendly Materials: Explore biodegradable PE films, bio-based polymers (e.g., PBAT), or recycled materials to appeal to environmentally conscious consumers.
- Skin-Friendly Features: Incorporate soft-touch coatings or skin-safe additives into the backsheet to enhance comfort.
- Laminated Textile Backsheets: Combine PE film with nonwoven fabric to achieve a cloth-like feel with breathable or non-breathable properties.
FAQs
Both are fully waterproof against liquid water. The difference is that breathable PE film allows water vapor transmission through micropores, while non-breathable PE film blocks all moisture transmission. Neither allows liquid water to pass through.
Breathable PE film is generally recommended for sensitive skin, as it allows water vapor to escape, helping maintain a drier skin microclimate. Research indicates that breathable backsheets are associated with lower skin hydration increase, which may contribute to reduced incidence of diaper rash.
Non-breathable PE film can be used in various diaper types and provides equivalent liquid leak protection. However, for extended wear or sensitive skin applications, breathable alternatives are typically preferred.
No. Breathable PE film is designed to be fully waterproof against liquid water. The micropores are sized to block liquid water droplets while allowing water vapor molecules to pass. Leak protection is comparable to non-breathable film when properly manufactured.
No. This is a common misconception. Both film types are equally waterproof against liquid water. The micropores in breathable film are too small for liquid water to penetrate. The difference is only in water vapor transmission, not liquid barrier performance.
Conclusion
In conclusion, both breathable and non-breathable PE films offer distinct advantages for different applications. Breathable PE films are optimal for consumers who prioritize comfort and potential skin health benefits, as they allow water vapor transmission that helps manage the diaper's internal microclimate. Non-breathable PE films provide equivalent liquid leak protection at a potentially lower cost, making them suitable for budget-conscious markets or short-term use products.
The choice between them should be based on your target audience's needs, regional market requirements, and product positioning strategy—not on the misconception that one is "more waterproof" than the other. By understanding the actual scientific differences and aligning your material selection with customer priorities, brands can optimize both product performance and market appeal.
References & Scientific Sources
- Uyanık, S. & Kaynak, H. K. (2017). "A Comparative Study on the Performance Properties of Breathable and Non-Breathable Baby Diaper Back Sheet." Journal of the Textile Institute (via Semantic Scholar). https://pdfs.semanticscholar.org/d749/5c2d69e7796fa9269f5fdf9fc30bb360eb38.pdf
- Sabancı University / ITU. (2025). "Developing a Method for Measuring Breathability of Baby Diapers." Proceedings of the 16th ULPAS Conference, Istanbul. https://research.sabanciuniv.edu/51866/1/Book_of_Proceedings_of_the_16th_ULPAS__ITU_May_2025_V2-compressed.pdf
- EDANA — European Disposables and Nonwovens Association. (2026). Nonwoven Industry Standards & Technical Guidelines for Hygiene Applications. https://www.edana.org/
- INDA — Association of the Nonwoven Fabrics Industry. (2026). Market Insights & Testing Standards for Absorbent Hygiene Products. https://www.inda.org/
- ASTM International. (2018). ASTM E96/E96M-16: Standard Test Methods for Water Vapor Transmission of Materials. West Conshohocken, PA: ASTM International.
- ISO 15496:2004. Textiles — Measurement of water vapour permeability of textiles for the purpose of quality control. International Organization for Standardization.
