Overview
Melt-blown polypropylene (MBPP) is a non-woven fabric produced by extruding molten polypropylene through fine nozzles, followed by high-speed air blowing to create microfibers. The process results in a material with exceptional filtration properties due to its randomly arranged, ultra-fine fibers (typically 1–5 microns in diameter). MBPP gained prominence during the COVID-19 pandemic as a critical component in surgical masks and N95 respirators. Its hydrophobic nature and electrostatic charge enhance particle capture without compromising breathability, making it indispensable in healthcare and industrial filtration.
Physical and Chemical Properties
MBPP exhibits a low density (0.91–0.94 g/cm³) and a melting point of 160–170°C, typical of polypropylene. Its fibers are hydrophobic, repelling water while allowing air passage, a key feature for filtration applications. The material is chemically inert to most acids, alkalis, and organic solvents at room temperature. The fabric's filtration efficiency depends on fiber diameter, layer thickness, and electrostatic treatment. Standard MBPP for masks has a basis weight of 25–50 g/m² (GSM) and achieves >95% bacterial filtration efficiency (BFE). Higher GSM variants (e.g., 150 GSM) are used for oil absorption due to their porous structure.
Main Applications
The primary use of MBPP is in medical and protective equipment, including face masks, surgical gowns, and sterile wraps. Its ability to block airborne particles (≥0.3 microns) makes it ideal for N95 respirators and HEPA filters. Industrial applications include air conditioning filters, automotive cabin filters, and oil-absorbent materials for spill cleanup. MBPP is also used in hygiene products like diapers and sanitary napkins for its softness and liquid barrier properties. Emerging uses include battery separators and geotextiles.
Safety and Storage
MBPP is generally non-toxic and safe for skin contact, but inhalation of loose fibers during manufacturing should be avoided. Processors should use ventilation or PPE to minimize exposure to airborne particulates. Store MBPP rolls in a dry, cool environment (<30°C) away from UV light to prevent degradation. Avoid contact with strong oxidizers or high temperatures (>120°C), which may compromise fiber integrity. Electrostatic-treated MBPP should be handled carefully to preserve its charge.
B2B Procurement Guide
When sourcing MBPP, prioritize suppliers with ISO 13485 certification for medical-grade material. Key specifications to verify include BFE (>95%), particle filtration efficiency (PFE), pressure drop (<5 mm H2O/cm² for masks), and grammage (GSM). For industrial applications, consider oil absorption capacity (≥10 g/g) or dust holding capacity. Bulk pricing varies with raw polypropylene costs; negotiate based on order volume (typically 1–20 tons for mid-sized buyers). Lead times range from 2–6 weeks, with longer delays during high-demand periods.
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