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| > Whatman PM 2.5 air
monitoring filters |
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A new, high purity, thin PTFE membrane in a sequentially numbered
chemically resistant polypropylene support ring has been developed for
PM 2.5 Ambient Air Monitoring. Whatman PM 2.5 membranes have low tare
mass for accurate gravimetric determinations. The unique thermally
stable design eliminates curling, keeps the membrane flat and makes the
filter robot-friendly.
The PM 2.5 PTFE membranes are manufactured under clean-room
conditions. These chemically resistant, low chemical background filters
permit sensitive, interference-free determinations. No glues or
adhesives are used in making these 46.2 mm diameter products.
Statement of Conformance
PTFE Filters for EPA PM 2.5 Reference Method.
Under the requirements of 40 CFR Part 50, Appendix L, shown below,
the manufacturer must perform the following tests as listed.
Any filter manufacturer or vendor who sells or offers to sell filters
specifically identified for use with this PM 2.5 reference method shall
certify that the required number of filters from each lot (0.1 percent
or 10, whichever is greater) of filters offered for sale have been
tested as specified for the following tests and meet 90 percent of each
of the design and performance specifications:
- Loose, Surface Particle contamination. (Drop Test - Weight Loss
Stability)
- Temperature Stability. (Temperature - Weight Loss Stability)
Any filter manufacturer or vendor who sells or offers to sell filters
specifically identified for use with this PM2.5 reference method shall
certify that a minimum number of 50 filters from each lot of filters
offered for sale have been tested as specified for the following tests
and meet 90 percent of each of the design and performance
specifications:
Filter Type
Filter Diameter
Filter Thickness
Filter Pore Size
Support Ring Width
Support Ring Thickness (Total)
Maximum Pressure Drop (Clean Air)
Maximum Moisture Pick-up
Collection Efficiency
Alkalinity
Special Requirements
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 non-uniformity, or any other
obvious filter defect.
Whatman, hereby states that every manufacturing lot that is offered
for sale, and is identified for use with the PM2.5 reference method,
conforms to EPA acceptance criteria as listed on the back of this
document.
| Technical Specifications -
PTFE Filters for Use in US EPA PM 2.5 Ambient Air Monitoring |
| Property |
Test Method |
Unit of Measure |
Value |
Range |
| PTFE Filter Media |
n/a |
n/a |
PTFE |
— |
| Filter Thickness |
micrometer |
µm |
40 |
±10 |
| Filter Diameter |
mm |
template |
46.2 |
2.5 |
| Filter Pore Size |
ASTM F 316-94 |
µm |
2 |
maximum |
| Support Ring Media |
n/a |
n/a |
Polypropylene |
— |
| Total Support Ring Thickness |
mm |
mm |
0.38 |
±0.04 |
| Support Ring Width |
mm |
template |
3.68 |
+0.00 –0.51 |
| Particle Retention (0.3 µm) |
ASTM D 2986-91 |
% |
99.7 |
minimum |
| Pressure Drop (0.3 µm) @ 16.67
liters/min. |
ASTM D 2986-91 |
cm H20 |
30 |
maximum |
| Alkalinity |
Section 2.12 |
|
|
|
| |
EPA/600/R-94/038b |
µeq/g of filter |
<25 |
maximum |
| Temperature Wt. Loss Stability |
as above |
µg |
<20 |
average |
| Drop Test Wt. Loss Stability |
as above |
µg |
<20 |
average |
| Moisture Wt. Gain Stability |
as above |
µg |
<10 |
average |
| Maximum Trace Element
Concentration by X-Ray Fluorescence |
| Ion |
ng/cm2 |
Ion |
ng/cm2 |
Ion |
ng/cm2 |
Ion |
ng/cm2 |
Ion |
ng/cm2 |
Ion |
ng/cm2 |
| Al |
94.4 |
Sc |
7.2 |
Ni |
3 |
Br |
2 |
Pd |
9.6 |
Cs |
25 |
| Si |
32.8 |
Ti |
13.8 |
Cu |
2.8 |
Rb |
2 |
Ag |
9.6 |
Ba |
32.2 |
| P |
22.6 |
V |
4.8 |
Zn |
2.2 |
Sr |
2.2 |
Cd |
10.8 |
La |
87.6 |
| S |
13.4 |
Cr |
2.2 |
Ga |
1.8 |
Y |
14.6 |
Sn |
15.2 |
W |
5 |
| CI |
9.4 |
Mn |
2.2 |
Ge |
3 |
Zr |
13.2 |
Sb |
14.4 |
Au |
4.4 |
| K |
5.6 |
Fe |
5.8 |
As |
2.8 |
Mo |
11.6 |
Te |
16.2 |
Hg |
4.4 |
| Ca |
8.2 |
Co |
4 |
Se |
1.6 |
Rh |
9.4 |
I |
18.6 |
Pb |
4.8 |
| Ordering Information - PM 2.5
Air Monitoring Filters |
| Diameter (mm) |
Product Description |
Catalogue Number |
Quantity/Pack |
| 46.2 |
PTFE Membrane with Polypropylene
Support Ring, Sequentially Numbered |
7592-104 |
50 |
|
+32 (0) 16
58 90 45 
+32 (0) 16
50 90 45