MultiDensity™ Disks

Introducing the IW Tremont MultiDensity™ filter disk. This exciting new product is a 100% borosilicate binderless glass microfiber filter which demonstrates several layers of density along with a unique surface formation that speeds and optimizes filtration. These filter disks can handle sample preparation tasks typically considered too challenging for other analytical filter products. This unique product bridges the gap between macro and micro analytical filtration.

Using a newly developed production method Tremont produces this filter with a final retention stage selection of <0.5μm to 2.7μm (the same as Tremont’s binderless glass microfiber line of products). The unique filter has a robust prefilter built-in which captures particulate from >300μm and binds typically difficult to filter substances without clogging such as:

• Lipids (natural oils and waxes)
• Petrochemical oils, tars
• Cellular matter
• Proteins
• Irregularly granular matter

Viscus suspensions and slurries The filter has been optimized to meet the extreme demands of high fluidic volume:

• Manifold vacuum filtration
• Short path extraction methods
• Positive pressure devices
• Structured devices such as inline filters & capsules

The flow and drainage rate is exceptionally rapid via its highly irregular surface formation which has high and low points that aid in the reduction of surface loading.

The unique fibers which sit on the outermost surface of the pre-filter side are designed to extend up and add further prefiltration structure similarly to glass floss. In standing solutions the prefilter side resists compaction causing surface plugging found in other common filter configurations.

The filter is free of binders, glues and resins which ensure a higher purity filtrate. These filters demonstrate very low extractables. This filter replaces multi pre-filtration stage products In applications where a series of prefilters are used to prepare sample prior to membrane filtration, saving time and reducing variability in extract signature upon analysis methods.

The borosilicate glass is highly resistive to aggressive solvents, acids* and base with a usable range of 0-14pH and a wide effective temperature range of -200 to 500 °C. **

The final filtration stage is available in the same porosity range of IW Tremont’s binderless glass line, including the newly introduced Grade A-83 Nano-Scale filter.

Fluidic volume capacity to diameter relationship example…food sciences: (H2O + 20% tomato paste solution homogenized, 1.5 μm final retention, 2-3bar vacuum, 15 °c)

This is the top side of a MultiDensity™ after filtering 300ml of a homogenized food sample (tomato paste) for analysis. Note the heavily solids laden surface. A sample of this type would have required several filters, possibly a funnel change and significantly more time in the work flow.

This is the bottom side of a MultiDensity™ after the filtration process. Notice the lack of sample coloring. This is due to the capture of all of the solids on the top surface and within the zones of density within the depth of the filter. This effect is very different from a traditional filter.