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.
Engineered by Kae Hwa Industrial Co., Ltd. — a filler-free microporous polypropylene film for clean, high-performance converting.
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 rely on 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 — creating a uniform microporous network without conventional mineral-filler loading.
The resulting membrane allows moisture vapor to pass through while helping resist liquid water penetration. Its filler-free composition avoids the chalky mineral residue commonly associated with calcium-carbonate-filled films, supporting cleaner handling during slitting, lamination, sealing, and other downstream converting processes.
Compared with many conventional PE-based breathable films, the polypropylene structure provides enhanced thermal stability and dimensional control. When paired with compatible PP nonwovens and carefully selected bonding systems, MicroBreath™ Pure can also support mono-material-oriented laminate development for 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 develop within the PP-based matrix — providing pathways for moisture vapor transmission while helping prevent liquid water from passing through the membrane.
Because the formulation does not rely on CaCO₃ particles to create its pore structure, it avoids filler agglomeration and mineral-related residue, offering a cleaner material platform for sensitive laminate structures and technical converting environments.
Stretch-formed micropores support consistent moisture-vapor transmission.
The membrane helps resist liquid penetration while allowing moisture vapor to escape.
The filler-free formulation avoids chalky residue associated with conventional mineral-filled breathable films.
Film properties can be adjusted to meet target MVTR, hydrostatic resistance, and mechanical requirements.
Provides a stable platform for integration with compatible polypropylene nonwovens and technical substrates.
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. Because the formulation contains no conventional CaCO₃ filler, it prevents chalky residue from being released during film handling and converting — helping keep rollers, guides, and inspection surfaces cleaner.
Quality control focuses on critical characteristics such as basis weight, thickness, surface quality, mechanical consistency, and breathable performance, with controlled manufacturing conditions maintaining stable film properties across production batches. The crystalline PP-based structure also provides a reliable balance of tensile strength, flexibility, and dimensional stability during unwinding, tension control, lamination, slitting, and fabrication.
Avoids calcium-carbonate-related powder and chalky residue.
Helps reduce filler-related deposits on rollers and processing equipment.
Controlled film formation supports consistent breathable and barrier performance.
Provides a stable balance of tensile strength, flexibility, and dimensional control.
Supports controlled unwinding, transport, lamination, and slitting.
Film specifications can be verified according to basis weight, thickness, surface quality, and target performance.
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, and can be evaluated for integration with compatible PP nonwovens in two-layer or three-layer laminate constructions.
The filler-free formulation helps reduce CaCO₃-related residue and mineral deposits on lamination rollers.
Supports selected higher-temperature bonding and converting conditions compared with many conventional PE-based films.
Controlled dimensional stability helps reduce excessive shrinkage, curling, wrinkling, and edge deformation.
Compatible material structures can be evaluated for thermal sealing, heat bonding, and ultrasonic joining.
Suitable for development with PP nonwovens and other compatible technical substrates.
Controlled film formation supports clean cutting and consistent edge quality during customized roll conversion.
The final operating window must be confirmed according to the specific film grade, basis weight, 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, and PP-based composite fabrics.
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 mineral-filler levels. Kae Hwa also integrates casting-film control with in-line lamination capabilities, combining breathable films with compatible nonwovens and fabrics for customized multilayer structures.
Can be paired with compatible polypropylene nonwovens for more material-compatible composite structures.
Specifications can be adjusted according to target breathability, barrier performance, strength, and converting requirements.
PP-compatible masterbatch systems can provide functional shading, product identification, or customized brand appearance.
Embossing patterns can adjust grip, gloss, and tactile quality while meeting target barrier requirements.
Corona treatment and other surface modifications can be evaluated for printing, bonding, and lamination needs.
Film width, roll length, winding condition, and core specifications can be adapted to customer production lines.
MVTR, hydrostatic resistance, tensile properties, flexibility, color, and opacity can be developed for the intended application.
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.
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.
