Whatman™ Environmental Monitoring Filters
By Whatman/CytivaFor PM 2.5 ambient air monitoring
A new, high purity, thin PTFE membrane in a sequentially numbered chemical resistant polypropylene support ring. These filters are manufactured under the requirements of 40 CFR Part 50, Appendix L. Whatman certifies that the required number of filters (0.1 percent or 10, whichever is greater) from each lot offered for sale have been tested as specified for the following tests and meet each of the design and performance specifications. These include trace metal analysis by XRF and visual inspection for defects such as pinholes, support ring separation, chaff or flashing, loose material, discoloration, filter nonuniformity and any other obvious filter defect. Whatman hereby states that each manufacturing lot that is offered for sale, and is identified for use with the PM 2.5 or TSP reference methods, conforms to EPA acceptance criteria.
Specifications:
| Filter Medium | PTFE |
| Filter Thickness | 40µm |
| Filter Diameter | 46.2mm |
| Filter Pore Size | 2µm |
| Support Ring Media | Polypropylene |
| Total Support Ring Thickness | 0.38mm |
| Particle Retention (0.3µm) | 99.7% |
| Pressure Drop (0.3µm) @ 16.67 liters/min. | 30cm H20 |
| Alkalinity | <25µeq/g of filter |
| Temperature Wt. Loss Stability | <20µg |
| Drop Test Wt. Loss Stability | <20µg |
| Moisture Wt. Gain Stability | <10µg |