Glass Fiber Filters, 1.0 µm, 25 mm

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Part Number: 225-702

Glass Fiber Filters, 1.0 µm, 25 mm Overview

Glass Fiber Filter, 1.0 µm, 25 mm, no support pad included, 310 to 350 µm thick, binder-free, Type A/E; recommended for use with Button Sampler, pk/500

SKC Glass Fiber Depth Filters, made of binder-free borosilicate glass fiber, provide a tortuous path of openings that allow air to pass through but trap particles throughout the depth of the filter. Glass Fiber Depth Filters are autoclavable and provide high particle retention and wet strength. Supplied in bulk or preloaded cassettes
Specified in EPA methods for environmental particulate matter gravimetric analysis

  • Filter Type : Depth
  • Filter Material : Glass Fiber
  • Filter Pore Size : 1.0 μm
  • Filter Diameter : 25 mm
  • Filter Cassette Material : Filter Only
  • Filter Support : No
  • Preweighed : No
  • Matched-weight : No
  • Autoclavable : Yes
  • Binder-Free : Yes

Product Document

Custom Filters Order Forms

Glass Fiber Depth Filter closeup of fibers

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Type A/E Glass Fiber

    • For gravimetric analysis of air pollutants and testing dissolved/suspended wastewater solids


  • High flow rates, wet strength, and dirt (solids) holding capacities

Type A/B Glass Fiber

    • High dirt-loading capacity with thicker glass


  • Manufactured of the highest quality borosilicate glass microfibers

Depth Filter Pore Size Rating
A "nominal" or approximate pore size rating is usually applied to depth filters. Unlike membrane filters, depth filters do not contain a uniformly defined pore structure, but rather fibers or sintered particles that intertwine to create a torturous path of openings that allow air to pass through, but trap particles throughout the depth of the filter. Because of this structure, depth filters are usually tested for pore size by passing liquid containing particles of a certain size through the filter. If the filter traps an acceptable amount of the specific-size particles (despite the openings in the filter being larger than the test particles), that particle size becomes the "liquid nominal" pore size rating for the filter. Nominal pore size ratings are typically stated as, "Filter removes > xx % of particles = x µm."

A typical filter will have a rough side and a shiny side. The shiny side is easier to read under a microscope, therefore, expose the shiny side to the air for microscopic analysis. The rough side holds dust more effectively; expose the rough side for gravimetric analysis.