Glass microfiber filters are made of microfiber borosilicate and may or may not have binder. These filters have high filtration efficiency, good chemical stability, and low resistance. Glass microfiber filters can help to increase throughput by filtering out the larger particles before it reaches the main membrane.

For high efficiency air filters these become the material of choice. Glass Microfiber filter can be used to produce a separator without clapboard air filters for a variety of fields.