Binder free glass microfiber filters are made of 100% borosilicate, are highly pure and extremely white. They continue to perform over long periods unlike cellulose filters whose rate of filtration drops off rapidly as the particulate load increases. They are ideal for critical analyses in which impurities can be washed out of the filter. Moreover, binder free glass microfiber filters are temperature resistant up to 500°C or 550 °C (grade MG 550-HA ). They are available in different formats as in rolls, discs and sheets.