Cellulose Filter Papers for Separation Applications

Qualitative and quantitative cellulose filter paper is
available in a wide range of grades to meet different
separation applications.

Qualitative Cellulose Filters

Qualitative cellulose filter papers perform separation
by entrapping particulate within the random matrix of
cellulose fibers within the depth of the media. This
media is widely used in methods requiring the
determination and identification of particulate in both
liquids and gas. Also this natural fiber filter paper is
commonly used to clarify liquid samples.

Also available in fluted grades, which are easier to use and more
convenient than flat filters when used in a filter funnel. This format reduces your preparation
time due to its sharply creased prefolded pattern. Widely used for general laboratory separation
and clarification applications as well as for soil analysis methods.

Quantitative Cellulose Filters

Quantitative cellulose filter papers are primarily used in gravimetric analysis procedures and perform separations by entrapping particulate within the random matrix of cellulose fibers within the depth of the media. This media family is also widely used in methods to prepare samples for further testing using many types of instrumentation. These very high quality filter papers are manufactured from refined pulp and alpha linters. They are acid washed and have an extremely low ash content.

Specialty Cellulose Grades

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Material Specs

Cellulose Filter Paper Terms:

Filter Media: Nomenclature is serialized and no indication of grade or quality.
Furnish: The raw materials used in the manufacture of the wet laid product.
Ash content: Dry method, determined in exposure at 900ºC in muffle furnace.
Retention: Nominal retention of particulate at 98% efficiency in liquid.
Flow: Liquid flow rate speed relative to other comparable products listed in this product alignment.
Basis weight: Nominal weight of material per meter2 indicated “gram weight” unit of measure at 8% moisture.
Thickness: As measured under 4 psi using TAPPI method T411
Flat/Fluted: Flat stock is supplied as sheets, rolls or die cut parts. Fluted is ¼ or ½ quadrant funnel folding.
Surface: Stated as relative to comparable products listed in this product alignment.
Brightness: Stated as relative to comparable products listed in this product alignment.

Qualitative Cellulose Grades

Quantitative Cellulose Grades

Qualitative Cellulose Grades - (Technical Applications)

Click for Help to select a filter material based on your performance requirements

Products

New Catalog Number & Description List:   Downloadable Catalog List

Qualitative Grades

CFP1: Very widely used filter media demonstrating retention of approximately 11µm and medium flow rate. Used in a broad range of laboratory and environmental applications, this media is ideally suited in separating lead sulfate, calcium carbonate and calcium oxalate precipitates. This media is the standard for agricultural procedures such as soil and seed sample testing. Also, it is commonly used as a separation media in the food and beverage industry to extract liquids from solid samples.

Due to the consistent bright white color of this media, it is ideal for photometric stain intensity measurement of air samples. The media can also be impregnated with reagents for use in quantifying optical reflectance in gas detection procedures.

CFP2: A more retentive and absorbent media than CFP1, with approximately 8µm and a medium to slow flow rate. This media is ideal for general filtration and absorbent conveyance. Commonly used in plant growth trials and monitoring pre-isolated contaminants in air and gas.

CFP3: Virtually identical to CFP1, but twice as thick resulting in a significantly slower flow rate with a retention of approximately 6µm. This media does not clog as easily as the other qualitative cellulose types, which allows for much higher sample volume usage. This media also demonstrates very high levels of absorbency, permitting the media to be used as a sample conveyance substrate.

CFP4: The fastest flow rate demonstrated by any of the qualitative cellulose filter media’s resulting in a low retention rate of approximately 25µm. Very commonly used as the first media in a multi-stage filtration process. Ideally suited for use in organic extractions and biological fluid separation processes. Often specified in air monitoring applications where the entrapment of fine particulate is not required.

CFP5: Filtration of very fine particulate and clarification with applications in environmental sciences and chemical analysis.

CFP6: Very similar basis and thickness to CFP5, but with a slightly less retentive porosity. Also, due to the furnish of this paper, the ash content is higher than the balance of the qualitative line. Material is commonly specified in environmental applications.

Quantitative Grades

CFP40: Demonstrating medium retention and flow rates, this media is widely used in many general quantitative procedures in both liquid and gas. These procedures include: standard environmental test procedures such as soil sample analysis & the collection of trace elements and radionuclides in air samples. Also used in liquid food tests for determination of sediments, primary analysis of cements and slurries and sample preparation prior to spectrophotometry.

CFP41: Very fast flow rates and loose retention characteristics make this grade ideal for initial separation of gelatinous precipitates.

CFP42: This media demonstrates an extremely high retention rate for a cellulose filter media. Its uniquely high retention rate makes it ideal for any gravimetric analysis of very fine precipitates.

CFP43: Positioned as an intermediate within the quantitative cellulose family, this grade demonstrates medium retention and flow rates. It is ideal for gravimetric analysis of soil samples, surface water testing procedures and used in air sample monitoring equipment.

CFP44: Very similar to CFP42 but demonstrating a slightly wider retention rate within a similar flow rate. Typically used in the analysis of samples requiring separation of very fine precipitates.

 CFP540: Grade CFP540 quantitative cellulose filter media is ashless and hardened with increased wet strength. Medium flow rates and retention of approximately 7 - 8 um. Extremely low ash content of <0.01%. Thickness 0.210mm..

CFP541: Grade CFP541 quantitative cellulose filter media is ashless and hardened with increased wet strength. Fast flow rates and retention of approximately 21 - 23 um. Extremely low ash content of <0.01%. Thickness 0.200mm.

CFP542: Grade CFP542 quantitative cellulose filter media is ashless and hardened with increased wet strength. Very slow flow rates and retention of approximately 2 - 3um. Extremely low ash content of <0.01%. Thickness 0.170mm.

Capabilities

Tremont offers an impressive list of manufacturing capabilities and expertise in glass microfiber and cellulose filter media.  We leverage a longstanding and contractual relationship between several mills to put 6 papermaking machines and formers into production.  With this enormous capacity at our disposal, we are able to take a project from lab bench through pilot scale and ultimately full production with ease.

Our partner mill output exceeds 120 grade variants manufactured in the USA and internationally.   With chemists and scientists of several disciplines, experienced papermakers, the finest controls-on-machine plus a rigorous QA protocol, it is not often a project challenge is beyond our capability.

Paper making capabilities:

• Paper making machines in flat bed, slant bed, high speed fourdrinier and rotary forming styles.
• Furnish capabilities of: glass blends, cotton cellulose, soft wood, cotton/wood pulp, synthetics
• Various levels of water filtration, including R.O. for superior purity in analytical and diagnostic applications.
• Web widths from 24 inch (60.9cm) to 72 inch (182.8cm).
• Basis weights from 8lb to 138lb @ 3000ft² (13g/m² to 225g/m²).
• Binder free, Binder burn off, Acrylic, PVA and hybrid chemistries.
• Gantry mounted traversing densitometry as well as most other high-resolution verification sensors.
• Static pressure, mixed and multi-stage head boxes.
• Binderless, mixed box, spray on and pulper-saturation style binder introduction.
• Single and multi-stage vacuum boxes.
• Several screen variants for very high consistency formation.
• Wet stream or dry deckle trim.
• Unique end of machine board cut-off capability for very high density, high basis weight celluloses.
• FDA grade manufacturing capabilities.
• Lot selection, furnish verification and supply chain assurance.
• Cotton batch traceability "to farm" with unique commodity procurement services.

Converting capabilities:

After the papermaking process is complete, our experienced converting staff brings your project from large master rolls down to narrow reels or sheets with ease.  Sheeting, die cutting and other unique converting operations are performed at our Hawthorne, NJ facility under our strict ISO production environments.

• High speed rotary knife sheeting (+/- 0.03125 inch).
• Low speed, multi roll CNC sheeting (+/- 0.03125 inch).
• Low tensile strength sheeting capabilities handling the most challenging binderless glass grades to 60 inch web width.
• Vacuum stack counting with laser verification and tab insertion minimum 5 sheet count.
• Narrow roll slitting down to 1/4inch web width even in low tensile glass microfiber.
• Shaftless rewind with core ID's down to 1/2inch ID.
• Die cutting in manual, semi-automatic and automatic repeating modes.  Slow speed, platen, clicker, c-frame, fixed tool and bottom-up presses.
• Tonnage from 1 to 140ton in hydraulic and mechanical types.
• Narrow web <5.125 inch (13cm) rotary die cutting with unique "zero-tensile" capabilities, inline micro perforation and rotary parts cut-off.  Vacuum in-field parts removal.
• Programmable guillotine cutters from 30 to 44 inch (76.2cm – 111.76cm) width.
• Spreading table station for woven fabrics fabrication.
• Hole drilling, slotting and complex notching.
• Heat treating processes ranging from low temp, long exposure to flash and 1100°C muffle furnace treatments.
• Laminating via heat set, single and dual surface in web widths of 60 inch.