Whatman Cellulose Ester Membrane Filters ‒ MembraClear

Description

Mixed cellulose ester membranes designed for use with the ‘hot block method’
White with black grid for high contrast during asbestos testing using microscopy
Becomes transparent with acetone vapor treatment, distinguishing fibers from crystalline artifacts
0.8 μm pore size, with three filter diameter options

High-contrast black grid, clear filter background

GE’s MembraClear mixed cellulose ester membranes are designed for quick and clear fiber counting. Acetone vapor treatment renders the PCM filter clear, preventing confusion between asbestos fibers and crystalline artifacts. The black grid on the filter’s white surface enhances contrast.

Asbestos testing using the membrane filter method

The membrane filter method is used to assess the risk of potential asbestos contamination. First, sample air is pumped through mixed cellulose ester membranes to extract airborne fibers. The asbestos concentration is analyzed with phase contrast microscopy, and asbestos fibers are analyzed in line with set rules that determine if a space is within airborne exposure limits.