The CleanAir Yellow Pages
Particulate Sampling Supplies - Filter Media
All of these filter are available as either un-tared or tared.
We have pre-weighed filter media ready for shipping today.
All of these items can be ordered pre-weighed to any published method.
We also offer pre-weighed beakers and post weighing services.
Glass, Quartz, Teflon or Alundum Media Preweighed Ready to Ship Organic Filter Media Particles in: Ambient Air 8" x 10" Whatman 8" x 10" Whatman Various, please call 800-223-3977 Various, please call 800-223-3977 Not Recommended Stack Emissions Whatman 934-AH Whatman 934-AH Various, please call 800-223-3977 Anderson Not Recommended HF in Stack or Process Not recommended Not recommended Teflon Filter please call 800-223-3977 Not Recommended Process with High Loading Alundum Thimble Alundum Thimble Various, please call 800-223-3977 Various, please call 800-223-3977 Alundum Thimble Engine Exhaust Various, please call 800-223-3977 please call 800-223-3977 please call 800-223-3977 please call 800-223-3977 Not Recommended Residence Acetate Membrane
Acetate Membrane please call 800-223-3977 Not Recommended Not Recommended Bridge work 8" x 10" Whatman please call 800-223-3977 please call 800-223-3977 please call 800-223-3977 Not Recommended Demolition 8" x 10" Whatman please call 800-223-3977 please call 800-223-3977 please call 800-223-3977 Alundum Thimble Asbestos Various, please call 800-223-3977 please call 800-223-3977 please call 800-223-3977 please call 800-223-3977 Not Recommended Other Technical Notes.
The method calls for the filter to be used "coarse side up." The new 934-AH filters look pretty much the same on both sides.What side is up?
The Whatman glass microfiber filters (except for the Multigrade 150) are bi-directional and can be placed in a filter holder with either side facing up or down. Older lots of 934-AH paper, which were manufactured in a different location and on a different paper-making machine, did show different surface textures on each side, but they too, were bi-directional. The test protocol should not have specified that the filter be used with a particular side up.What is the best way to mark filters for identification purposes?
This depends on the intended filter use. All marking materials add substance to the filter. Some inks contain metals and organics. It is recommended that the marking method be specified after considering all the possible analysis that may be performed on the filter and filtrate. If it is not possible to limit the possible analysis options consider making very small notches on the outer edge before taring filters. In all cases we recommend marking the petri dish with a complete description of the filter including the filter ID.
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