Cellulose Filter Pads for Depth Filtration

Filter Sheets

ErtelAlsop has been manufacturing cellulose based depth filter pads, or sheets for a wide range of applications in the pharmaceutical, chemical, cosmetic, electric utility and food and beverage markets since 1920. Formulations for these filter pads have evolved over time to suit the changing demands of our customers and the increasing need for low cost, highly efficient filter media. By using a unique blend of cellulose pulp and various filter aids, ErtelAlsop is positioned to offer the widest variety of filter media grades available.

Specifications & Features

Materials of Construction
Cellulose wood pulp, Perlite, Diatomaceous Earth, Activated Carbon, and Wet Strength Resin.

Depth Particle Retention
From 15 microns nominal down to 0.25 microns nominal with the ability to retain smaller than 0.25 micron particles.

Sizes Available

Over 300 precision dies are available to fit virtually any filter press.

High Solids Loading
Filter pads provide high solids loading due to the large internal surface area and void volumes present within the matrix of fibers and filter aid which comprise the filter pad. This extends filter life and provides greater throughput.

High Efficiency and Zeta-Potential
Zeta-Potential allows for the retention of negatively charged particles smaller than the rated pore size of the filter media over a wide pH range.

The matrix of fibers and filter aids can be manipulated so as to improve the retention qualities of the filter sheet, thereby prolonging membrane life when media selection is optimized. This, in combination with the positive charge inherent in ErtelAlsop's Micro-Media®, provides excellent particle retention efficiency.

Wide Compatibility
The basic components of filter pads, cellulose and/or filter aid, are natural products which have a wide range of compatibility. Therefore, the need for various product formulations is minimized, and limited to only those which provide specialized separation qualities. Additionally, ErtelAlsop uses only formaldehyde free wet strength resins.

Filter Press Compatibility
With over 300 precision dies to choose from, ErtelAlsop filter sheets can be cut to fit virtually any filter press.

Consistency
ErtelAlsop filter media are manufactured in our state of the art automated manufacturing facility. We also have full lot traceability, and every lot manufactured is subjected to our strict quality control requirements. With all of the process controls in place in our manufacturing stream, ErtelAlsop provides consistent product from batch to batch.
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Available Products

Alpha-Media™ Filter Pads
Alpha-Media™ Filter Pads are made with 100% cellulose Alpha Filter Media fibers. No fillers, no resins, just pure cellulose fibers. These grades, 140, 160 and 175 are used for intermediate to coarse filtration, in such applications as edible oils, insulating oils, cough syrups, plating solutions, fruit juices and others. Alpha-Media™ can also be supplied with wet strength resins for those applications where wet strength is important.

Micro-Media® Filter Pads
The addition of filter aids and wet strength resin differentiates the Micro-Media® Series from the Alpha-Media™ Series. But that is not where the differences end. The addition of these ingredients improves retention efficiencies by adding internal surface area and the positive charge known as Zeta-Potential. Zeta-Potential is the positively charged site within the matrix of fibers and filter aid which attracts negatively charged particles which may be smaller than the pore sizes available in the filter pad.

Wet strength resins are capable of being steam sterilized and are all free of formaldehyde. Filter aids used are Perlite and/or Diatomaceous Earth which also help to improve filtration efficiencies. Grades include: M-05, M-054, M-10, M-104, M-40, M-404, M-45, M-454, M-50, M-504, M-504T, M-70, M-704, M-85, M-854, and M-90.

Micro-Media® L Series Filter Media
Micro-Media® Filter Pads can be formulated using high purity cellulose to reduce the occurrence of false positives caused by 1,3 beta D glucans in cellulose pulp. This media was designed specifically designed for use by blood product manufacturers where specific controls on pyrogens and extractables are critical.

Micro-Media® XL Series Filter Pads
ErtelAlsop Micro-Media® XL Series Filter Media is impregnated with Celpure. ErtelAlsop is proud to have been chosen by Advanced Minerals, Inc. as their exclusive supplier in the Western Hemisphere of media formulated with this high quality Diatomaceous Earth. XL Series Media provides improved clarity and greater throughput. In independent testing, ErtelAlsop XL Series Media out performed competitor's standard grades by over 500%.

Micro-Media® LXL Series Filter Media
For the ultimate in quality assurance, ErtelAlsop LXL Series Media is formulated with both high purity cellulose and Celpure® high quality Diatomaceous Earth. High purity cellulose significantly reduces the amount of extractables released while Celpure® ensures higher flow rates.

Micro-Clear™ Carbon Filter Pads
Carbon has been used for many years in loose form to remove color and odor from liquids. In certain Microclear Filter Pads

applications the loose carbon can be replaced with a carbon impregnated filter pad. When using loose carbon, it is necessary to remove the carbon with some means of filtration. If that includes a plate and frame filter press, then the press can be dressed with Micro-Clear™ carbon filter pads, eliminating the need for dumping loose carbon into a mixing tank, and then scraping the carbon off of a filter paper or cloth.

ErtelAlsop offers its Micro-Clear™ series in four different grades, the MC-30, MC-35, MC-50, and MC-70. Each grade can be manufactured with various different grades of carbon, allowing ErtelAlsop to help optimize your filtration.

Pharmaceutical Grade Filter Pads
The pharmaceutical and biotech markets require a high level of functional consistency from filtration products. To provide a higher level of confidence for these customers, ErtelAlsop drafted its Drug Master File and submitted it to the FDA Center for Drug Evaluation and Research. ErtelAlsop manufactures all filter pads to very high standards, and the Drug Master File provides the documentation to ensure consistency in manufacturing and raw materials. All filter pads manufactured by ErtelAlsop are fully lot traceable back to the raw material suppliers, and their suppliers, where applicable and are supplied with a "P" certificate. The low extractables, low LAL concentrations, and highly consistent manufacturing process, make ErtelAlsop filter pads the ideal choice for your critical application.

ErtelAlsop also offers a Validation Guide to assist in the validation of its filter pads in your process. The Validation Guide contains information regarding raw materials, extractables, and general information about the product. The combination of ErtelAlsop "P" grade filter pads and ErtelAlsop's BioClean™ plate and frame filter press design, can help to simplify your depth filtration validation now more than ever.