 |
|
| | |
 PREFILTERS & DEPTH MEDIA |
Prefilters are often prepared from depth-type media, a random matrix of material which may or may not contain binder. These filters trap particles within the matrix and therefore have a high loading capacity. But because of this design, these filters do not have a clearly defined pore size, only a nominal rating.
These filters have applications outside of prefiltration, such as air and water pollution analysis, liquid clarification, and cell harvesting.
Advantec MFS prefilters are made of a variety of materials. Click on one of the following links for more information:
|
|  SEM Image: PTFE Fiber
 SEM Image: Glass Fiber |
If used as a prefilter, the filter should have a slightly smaller diameter than the filter membrane it precedes:
Filter Holder Model
(Vacuum Type) |
Recommended Prefilter Diameter (mm) |
If preceding final filter |
If used as final filter |
| 25mm models |
KG 25, KGS 25 |
16 |
25 |
| 47mm models |
KG 47, KGS 47, KSF 47, KGS 47 TF |
35 |
47 |
| 90mm models |
KG 90, KGS 90 |
70 |
90 |
 top of this page
|
|
Filter Holder Model
(Positive Pressure Type) |
Recommended Prefilter Diameter (mm) |
If preceding final filter |
If used as final filter |
| 13mm models |
KS 13 |
8 |
13 |
| 25mm models |
KS 25, LS 25, LP 25, KS 25F, PP 25 |
21 |
25 |
| 47mm models |
KS 47, KST 47, KS 47F, LS 47HP |
35 |
47 |
| PP 47, PFA 47 |
42 |
47 |
|
|
| |
 |
Glass Fiber Prefilters |
| |
| Prefilters made of dense borosilicate glass fibers: |
| Biologically inert with high chemical and thermal resistance |
| Unaffected by humidity and can be stored indefinitely |
| Can be easily sterilized by autoclave or baking |
| Contact us for more information on this line of products. |
|
Type |
Applications/Comments |
Weight (g/m2) |
Thickness (mm) |
Nominal Rating (μm) |
Binder |
Max. Temp. (°C) |
| GA-55 |
General purpose paper; suitable for air pollution monitoring |
55 |
0.21 |
0.6 |
None |
500 |
| GF-75 |
Most retentive grade; suitable for collection of IgC or other very fine protein precipitates; use to clarify aggressive chemical solutions; suitable for TCLP (EPA Method 1311) when used with KST142. |
75 |
0.35 |
0.3 |
None |
500 |
| GA-100 |
General purpose paper; suitable for filtration of precipitated cells or proteins, and air pollution monitoring |
110 |
0.44 |
1.0 |
None |
500 |
| GA-200 |
Thick paper; suitable for filtering viscous fluids such as liquid sugars and gels |
175 |
0.74 |
0.8 |
None |
500 |
| GB-100R |
Has low trace metal content; suitable for DNA?RNA and protein precipitates |
95 |
0.40 |
0.6 |
None |
500 |
| GB-140 |
Thick with moderate wet strength and loading capacity; suitable for industrial waste analysis |
140 |
0.56 |
0.4 |
None |
500 |
| GC-50 |
For use with 0.45μm or smaller membrane filter; suitable for scintillation counting and filtration of suspensions in industrial and waste water |
48 |
0.19 |
0.5 |
None |
500 |
| GC-90 |
High wet strength; suitable for clinical screening |
100 |
0.30 |
0.5 |
Organic |
120 |
| GD-120 |
High wet strength and high loading capacity |
123 |
0.51 |
0.9 |
None |
500 |
| GS-25 |
High wet strength with moderate loading capacity |
70 |
0.22 |
0.6 |
Organic |
120 |
| DP-70 |
High wet strength and loading capacity; suitable for dust mearurement |
170 |
0.52 |
0.6 |
Organic |
120 |
|
| *For additional specifications, click here. |
| top of this page |
| |
|
Quartz Fiber Prefilters |
| |
| Prefilters made of silica quartz fibers: |
| Biologically inert with highest chemical and thermal resistance |
| Unaffected by humidity and can be stored indefinitely |
| High purity prefilters contain low trace metal content |
| Can be easily sterilized by autoclave or baking |
| Contact us for more information on this line of products. |
|
Type |
Applications/Comments |
Weight (g/m2) |
Thickness (mm) |
Nominal Rating (μm) |
Binder |
Max. Temp. (°C) |
| QR-100 |
Suitable for high temperature filtration |
85 |
0.38 |
N/A |
None |
1000 |
| QR-200 |
Suitable for high temperature filtration |
200 |
1.0 |
N/A |
Inorganic |
1000 |
|
| *For additional specifications, click here. |
| top of this page |
| |
|
Cellulose Fiber Prefilters |
| |
| Prefilters made of high quality cellulose fibers - contain no binder: |
| Inert to organic solvents |
| Use as a prefilter to prolong membrane filter life |
| Contact us for more information on this line of products. |
|
Type |
Applications/Comments |
Weight (g/m2) |
Thickness (mm) |
Nominal Rating (μm) |
Binder |
Max. Temp.
(°C) |
| No. 27 |
Suitable for clarifying beverages and non-viscous oil and petroleum products |
N/A |
0.68 |
N/A |
None |
120 (180 in oil) |
| No. 1640 |
Suitable for removing fine particles, such as activated charcoal from alcoholic beverages |
N/A |
0.40 |
N/A |
None |
120 (180 in oil) |
| No. 1650 |
Similar to No. 1640, but withstands higher pressure and has faster flow rate |
N/A |
0.57 |
N/A |
None |
120 (180 in oil) |
|
| *For additional specifications, click here. |
| top of this page |
| |
|
PTFE Fiber Prefilters |
| |
| Prefilters made of pure PTFE fibers: |
| PTFE fibers are sintered to minimize fiber slough-off |
| Hydrophobic filter suitable for venting gasses |
| Thermostable to 260°C |
| Contact us for more information on this line of products. |
|
Type |
Applications/Comments |
Weight (g/m2) |
Thickness (mm) |
Nominal Rating (μm) |
Binder |
Max. Temp. (°C) |
| PF020 |
Suitable for venting air and gas or filtering hot acids/strong solvents; works well for both aqueous and non-aqueous filtration |
500 |
0.54 |
2 |
None |
260 |
| PF040 |
500 |
0.95 |
4 |
None |
260 |
| PF050 |
210 |
0.36 |
5 |
None |
260 |
| PF060 |
240 |
0.50 |
6 |
None |
260 |
| PF100 |
500 |
1.00 |
10 |
None |
260 |
|
| *For additional specifications, click here. |
| top of this page |
| |
|
Polyester Mesh Separators |
| |
| Separation sheets used to increase preformance in serial stack filtration: |
| Prevent pore binding by placing separator between two membrane filters in series |
| Increase flow rate and filtrate throughput |
| Contact us for more information on this line of products. |
| top of this page |
| |
|
Membranes
Glass Fiber Filter