100% pure borosilicate glass microfibers; contains no binders or additives
- High loading capacity
- Consistent uniformity and excellent weight repeatability
- Rapid flow rate
- Particle retention range: 0.7 - 3.1 µm
- Chemical and thermal resistance (up to 550°C)
- Long shelf life
GRADE 141 (3.1 µm): Must faster filtration speed with higher loading capacity than cellulose analytical papers with similar particle retention. Widely used as a depth type pre-filter ahead of final membrane filters. Sometimes used in combination with grade 121 as a graded porosity protective and retentive pre-filter for highly-efficient protection of membrane filters.
GRADE 131 (1.0 µm): Binder-free grade, found in many environmental applications, offers more retention than grade 111 with slightly lower filtration speed and loading capability. It is used in Method 2530, B (Particulate Floatables); and Method 3500-Al, E (Aluminum- Automated Pyrocatechol Violet/ PVC Method). Recommended for the collection of suspended solids in potable water and industrial wastes. In biochemical tests, grade 131 is suited for cell harvesting, liquid scintillation counting and the analysis of carbohydrates.