TJ Environmental is a retail business providing quality products and support to environmental laboratories and testing professionals. We offer filters and testing equipment for liquid and areosol monitoring (such as HotBlock, ghost wipes, BOD bottles, TCLP products, metals analysis products, ProWeigh filters, MaxFil, ZHE+, Digestion Vessels, flow meters, acetone vaporizers, and various filters for water and air testing) at very competitive prices.  We currently stock products by BGI, Environmental Express, J.D. Technical Services, Menzel, SPI Supplies and Technovation. Most orders received before 3 pm can be shipped to you from our office the same day that you place your order. That means no uncertain waiting time and delays, as with many suppliers. HotBlocks, BOD bottles and vessels, Microscope slides, gold filters

Preweighed Filters for European Standard EN 872- Determination of Suspended Solids in Water

ProWeigh filters ProWeigh®

ProWeigh filters, from Environmental Express, offer a timesaving, convenient way to perform Total Suspended Solids (TSS).

ProWeigh filters meet or exceed all requirements found in the 19th edition of Standard Methods for filters and their preparation for methods 2540D and 2540E and European Standard EN 872 – Water quality-Determination of suspended solids- Method by filtration through glass fiber filters February 1996.  ProWeigh filters are a duplication of the required tasks for TSS, not a new test method.  Over 5,000 ProWeigh filters are used every day!


!  PreWashed
All Proweigh filters are prewashed with three aliquots of deionized water while undergoing vacuum filtration.  The filters are then oven dried at 105oC and then stored in a desiccating cabinet.

!  PreWeighed
The filters are weighed robotically to the nearest 0.1mg with certified electronic balances.  This weighing is performed in a climate-controlled area to minimize any variations due to environmental conditions.

!  PreLabeled
The filter weights are printed on heat resistant Mylar labels that are affixed to 70mm aluminum pans.   A unique sample number and the filter weight are printed on the label. The weight appears in text and a 3 of 9 bar code.

ProWeighs for Volatile Solids
These ProWeigh filters are recommended when fixed or volatile solids are of interest.  After rinsing, they are heated to 550oC in a muffle furnace to drive off any volatile materials.  Then, they are desiccated, weighed to the nearest 0.1 milligram and quality checked for accuracy.

DoubleWeightTM Filters
These ProWeighs are 100% quality tested to double guarantee their weight stability.  After the initial weighing and labelling, each DoubleWeigh filter is redried, re-desiccated and reweighed to insure their weight stability to within 0.4 milligrams.

Other size filters can be special ordered, such as 50mm and 110mm.  Call for specific requirements and price.
Style
Catalog Number
Size
Reweigh %
Reproducibility
Accuracy
ProWeigh
F93342MM
42mm
8%
±0.2mg
±0.4mg max
ProWeigh
F93227MM
47mm
8%
±0.2mg
±0.04mg max
DoubleWeigh
F93447MM-X
47mm
100%
±0.2mg
±0.4mg max
ProWeigh for Volatiles
F93447VOL
47mm
8%
±0.2mg
±0.4mg max
ProWeigh 5 decimal
F93447MM-5
47mm
8%
±0.2mg
±0.07mg max
ProWeigh
F93455MM
55mm
8%
±0.2mg
±0.4mg max
ProWeigh
F93470MM
70mm
8%
±0.2mg
±0.4mg max
ProWeigh
F93476MM
76mm
8%
±0.2mg
±0.4mg max
DoubleWeigh
F93476MM-X
76mm
100%
±0.2mg
±0.4mg max
ProWeigh for Volatiles
F93476VOL
76mm
8%
±0.2mg
±0.4mg max
ProWeigh
F93490MM
90mm
8%
±0.2mg
±0.4mg max
DoubleWeigh
F93490MM-X
90mm
100%
±0.2mg
±0.4mg max
ProWeigh for Volatiles
F3490VOL
90mm
8%
±0.2mg
±0.4mg max


Each ProWeigh filter is washed, under vacuum, three times with 20ml aliquots of de-ionized water.
Filter drying in horizontal flow mechanical ovens insures uniform drying with no dead spots.
Cooling in a desiccators provides moisture free, stable filter weights.
All ProWeigh filters are weighed on certified, electronic analytical balances.
Each ProWeigh filter is washed, under vacuum, three times with 20ml aliquots of de-ionized water.
Filter drying in horizontal flow mechanical ovens insures uniform drying with no dead spots.
Cooling in a desiccators provides moisture free, stable filter weights.
All ProWeigh filters are weighed on certified, electronic analytical balances.