MicroBreath PP by Kae Hwa Industrial is a high-strength polypropylene breathable film engineered for industrial, agricultural, and protective applications. Offering superior tensile strength, thermal resistance, and chemical durability, it delivers stable microporous breathability and long-lasting waterproof protection.
MicroBreath™ Pure, developed by Kae Hwa Industrial Co., Ltd., is a filler-free microporous polypropylene film designed for applications requiring clean converting, stable mechanical performance, and controlled moisture-vapor transmission.
Unlike conventional breathable films that use calcium carbonate (CaCO₃) particles to create microvoids during stretching, MicroBreath™ Pure develops its breathable structure through a controlled crystalline stretching process within a PP-based matrix. This approach creates a uniform microporous structure without conventional mineral-filler loading.
The resulting membrane allows moisture vapor to pass through while helping resist liquid water penetration. Its filler-free composition also avoids the chalky mineral residue commonly associated with calcium-carbonate-filled films, supporting cleaner handling during slitting, lamination, sealing, and other downstream converting processes.
With its balance of breathability, liquid resistance, mechanical stability, and low mineral residue, MicroBreath™ Pure is suitable for medical protective laminates, technical apparel, outdoor materials, PP nonwoven composites, and other high-performance applications where material cleanliness and processing consistency are important.
Compared with many conventional PE-based breathable films, the polypropylene structure provides enhanced thermal stability and dimensional control, helping expand the processing options available for selected lamination and fabrication conditions.
When paired with compatible PP nonwovens and carefully selected bonding systems, MicroBreath™ Pure can also support mono-material-oriented laminate development and more material-compatible product design.
MicroBreath™ Pure features a microporous structure formed through controlled polypropylene crystalline stretching rather than conventional calcium-carbonate filler loading.
During the stretching process, fine micropores are developed within the PP-based matrix. These pores provide pathways for moisture vapor transmission while helping prevent liquid water from passing through the membrane.
This controlled structure allows MicroBreath™ Pure to balance breathable comfort with liquid resistance, supporting applications where moisture management and barrier performance must work together.
Because the formulation does not rely on CaCO₃ particles to create its pore structure, it avoids filler agglomeration and mineral-related residue. This provides a cleaner material platform for sensitive laminate structures and technical converting environments.
Controlled Microporous Structure
Stretch-formed micropores support consistent moisture-vapor transmission.
Liquid Water Resistance
The membrane helps resist liquid penetration while allowing moisture vapor to escape.
No CaCO₃ Mineral Filler
The filler-free formulation avoids chalky residue associated with conventional mineral-filled breathable films.
Balanced Barrier Performance
Film properties can be adjusted to meet target MVTR, hydrostatic resistance, and mechanical requirements.
PP-Based Material Structure
Provides a stable platform for integration with compatible polypropylene nonwovens and technical substrates.
MicroBreath™ Pure can be customized according to target basis weight, thickness, pore structure, tensile performance, elongation, surface appearance, and converting requirements.
When used in medical, protective, or other regulated applications, final barrier performance and compliance must be verified using the complete laminate or finished-product construction.
MicroBreath™ Pure is engineered to provide stable film formation and reliable mechanical performance without the mineral-filler residue commonly associated with calcium-carbonate-filled breathable films.
Quality control focuses on critical film characteristics such as basis weight, thickness, surface quality, mechanical consistency, and breathable performance. Controlled manufacturing conditions help maintain stable film properties across production batches.
Because the formulation contains no conventional CaCO₃ filler, it prevents calcium-carbonate-related chalky residue from being released during film handling and converting.
This helps create a cleaner processing environment and reduces the potential for mineral deposits to accumulate on rollers, guides, inspection surfaces, and other converting equipment.
The crystalline PP-based structure also provides a reliable balance of tensile strength, flexibility, and dimensional stability. Under properly controlled converting conditions, MicroBreath™ Pure is designed to maintain stable web handling and pore performance during unwinding, tension control, lamination, slitting, and fabrication.
No Mineral-Filler Dusting
Avoids calcium-carbonate-related powder and chalky residue.
Cleaner Converting Conditions
Helps reduce filler-related deposits on rollers and processing equipment.
Stable Pore Structure
Controlled film formation supports consistent breathable and barrier performance.
Reliable Mechanical Integrity
Provides a stable balance of tensile strength, flexibility, and dimensional control.
Consistent Web Handling
Supports controlled unwinding, transport, lamination, and slitting.
Controlled Quality Inspection
Film specifications can be verified according to basis weight, thickness, surface quality, and target performance criteria.
Final mechanical and barrier performance depends on the selected film grade, basis weight, processing conditions, substrate structure, and finished-product design.
MicroBreath™ Pure is designed for technical converting environments where thermal stability, web control, and clean processing are important.
The PP-based structure provides higher temperature resistance than many conventional PE breathable films, supporting a broader processing window for selected lamination, thermal bonding, sealing, and fabrication operations.
This enhanced thermal stability helps the film maintain dimensional control under properly managed heat, pressure, tension, and line-speed conditions.
MicroBreath™ Pure can be evaluated for integration with compatible PP nonwovens and other technical substrates in two-layer or three-layer laminate constructions.
The final operating window must be confirmed according to the specific film grade, basis weight, thickness, laminate construction, adhesive or bonding system, temperature, pressure, web tension, and production speed.
MicroBreath™ Pure is particularly suitable for converters developing medical protective laminates, technical apparel materials, PP-based composite fabrics, and other applications where clean processing and stable fabrication are required.
The filler-free PP-based construction of MicroBreath™ Pure supports simplified material design and compatibility with polypropylene-based substrates.
When combined with compatible PP nonwovens and carefully selected bonding systems, the film can support mono-material-oriented laminate structures. Using materials from the same polymer family may simplify material recovery compared with composite structures containing multiple incompatible polymer types or high levels of inorganic mineral filler.
Actual recyclability depends on the complete finished-product construction, including the membrane, substrate, adhesive, printing ink, masterbatch, surface treatment, sewing components, accessories, and available recycling infrastructure.
Kae Hwa also integrates casting-film control with in-line lamination capabilities, allowing breathable films to be combined with compatible nonwovens and fabrics for customized multilayer structures.
MicroBreath™ Pure is suitable for breathable film and laminate development in applications such as:
Medical, viral-barrier, blood-barrier, sterilization, chemical-resistance, or other regulated claims apply only to specific final constructions that have been tested according to the relevant standards. Company records identify certain PP non-filler medical laminate series as having passed ASTM F1671, but this should not be presented as a blanket certification for every standalone MicroBreath™ Pure film grade.
| Brand | MicroBreath™ Pure |
| Product Form | Roll |
| Material | 100% High-Purity Polypropylene (PP) — 100% Filler-Free |
| Structure | Single Layer Crystalline Microporous Film |
| Breathability Mechanism | Pure Crystalline Stretching Technology (Non-Mineral, Zero-Dusting Network) |
| Barrier Properties | High Hydrostatic Pressure Resistance & Excellent Chemical Inertness |
| Surface Treatment | Smooth / Embossed / Corona Treatment / Rotogravure Printing (1–4 Colors) / Custom Colors |
| Weight | 10 - 100 gsm |
| Overall Width | 80 - 2000 mm (Customizable) |
| Length | 1000 - 6000 M |
| Application | Cleanroom-grade protective apparel, high-temperature sterilizable medical drapes & packaging, mono-material recyclable technical textiles, industrial filtration media |
With more than 60 years of expertise in polymer engineering and breathable membrane development, Kae Hwa is a trusted global supplier of high-performance waterproof & breathable materials. From hygiene and medical to industrial and packaging applications, our products are engineered to deliver durability, comfort, and long-term consistency under demanding conditions.
As one of the earliest companies in Asia to commercialize breathable PE films, we continue to advance film technology through material innovation, structural engineering, and precise process control.
Your Choice, Our Responsibility
Conventional breathable films (such as our Classic series) rely on blending Calcium Carbonate ($CaCO_3$) mineral fillers with polyolefins and stretching them to create pores around the particles. In contrast, MicroBreath™ Pure is 100% filler-free. It utilizes advanced polypropylene crystalline stretching technology to form a highly stable micro-network without any inorganic additives, delivering absolute polymer purity.
Traditional mineral-filled films carry an inherent risk of "mineral dusting" or shedding chalky residues under mechanical stress or high-speed converting. MicroBreath™ Pure completely eliminates this risk. This zero-dusting structural integrity makes it the definitive choice for sensitive environments where particle contamination is strictly prohibited, such as semiconductor cleanroom apparel, critical medical PPE (surgical gowns), and high-purity technical packaging.
Because MicroBreath™ Pure is formulated from 100% pure polymer without inorganic filler contamination, it offers a perfect Mono-Material recycling profile. When laminated onto Polypropylene (PP) nonwovens, the entire composite material can be directly re-granulated and recycled together without material degradation, aligning seamlessly with strict global circular economy standards.
Yes. Pure polypropylene has a naturally higher melting point and superior thermal resistance compared to Polyethylene (PE). While it resists thermal shrinkage and pin-holing much better under high web tension, it requires a higher processing temperature window during hot-melt adhesive bonding, extrusion coating, or ultrasonic welding. It provides exceptional bond strength when paired with PP nonwovens.
Absolutely. Through our precision casting and controlled stretching technology, we can precisely engineer the crystalline pore distribution to achieve consistent Moisture Vapor Transmission Rates (MVTR) ranging from low to high permeability, matching or exceeding industry standards for conventional breathable membranes while providing significantly higher mechanical tensile strength.
