Gas Filter Sleeves Resist Mechanical Fatigue
Porvair Polypropylene Gas Filter (PPGF) sleeves are made from proprietary binder-free, polypropylene fibre filter media, designed to provide a highly permeable matrix with low resistance to gas flow. According to Porvair Filtration Group, the filtration efficiency of the PPGF sleeves has been extensively tested and confirmed to be fully compliant with the requirements of T-SP-E-13. This standard requires a gas filter to achieve 95 per cent efficiency at the required particle size stated.
The PPGF material has a gravimetric efficiency of 99.95 per cent when tested over a size range of 0.75 to 10 micron. PPFG filter sleeves are manufactured in a seamless circular method using a mandrill former, upon which the needling is performed. This process enables a filter media with a high void fraction of approximately 75 per cent to be produced, which provides the benefit of a high relative dirt capacity. Porvair claims the material's compressive nature enhances filtration because, as it nears its end-of-life condition (determined through differential pressure), the material closes up and strengthens to prevent breakthrough of the retained solids.
According to the company, the use of polypropylene in its PPFG sleeves provides a material with an inherently high resistance to chemicals; a broad thermal operating range; and the ability to resist mechanical fatigue. Polypropylene has a relatively low surface energy of approximately 30mN/m and therefore has a tendency towards hydrophobicity. This enables it to repel water that may be present in droplet forms in gas flows. Because the material is regarded as recyclable, Porvair claims it poses a minimal environmental risk.
The PPGF material has a gravimetric efficiency of 99.95 per cent when tested over a size range of 0.75 to 10 micron. PPFG filter sleeves are manufactured in a seamless circular method using a mandrill former, upon which the needling is performed. This process enables a filter media with a high void fraction of approximately 75 per cent to be produced, which provides the benefit of a high relative dirt capacity. Porvair claims the material's compressive nature enhances filtration because, as it nears its end-of-life condition (determined through differential pressure), the material closes up and strengthens to prevent breakthrough of the retained solids.
According to the company, the use of polypropylene in its PPFG sleeves provides a material with an inherently high resistance to chemicals; a broad thermal operating range; and the ability to resist mechanical fatigue. Polypropylene has a relatively low surface energy of approximately 30mN/m and therefore has a tendency towards hydrophobicity. This enables it to repel water that may be present in droplet forms in gas flows. Because the material is regarded as recyclable, Porvair claims it poses a minimal environmental risk.
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