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In Stack Thimbles – 25 x 90mm

In Stack Thimbles – 25 x 90mm

Apex Instruments stocks a variety of fiber thimbles for in-stack particulate sampling. The thimbles are seamless, high purity filters, and available in two different fiber types: borosilicate glass and quartz. Borosilicate glass fiber thimbles are acid-washed to reduce the trace metal content to an absolute minimum. The quartz fiber thimbles are strengthened with alumina and are pre-fired at 900⁰C for 2 hours during manufacturing to stabilize the weight prior to use. The gas collection efficiency of the thimbles is 99.95% (0.3 micron DOP). The 25×90 mm thimbles are specially manufactured for stack sampling and tapered for easy loading. Cellulose thimbles are available upon request.

SKU: GF-2590❒ Category:


Thimble filters are seamless and made of high purity materials. Quarts thimbles are pre-fired. PTFE thimble max temperature is 260ºC.

Glass fiber retention: 99.99%
Quartz fiber retention: 99.99%
PTFE fiber retention: 99.99%