Overview

Antarisz™ cellulose filter papers are manufactured for laboratory, environmental, industrial, food, beverage, and general filtration applications. Understanding common filter paper specifications helps users select the most appropriate grade for particle retention, flow rate, sample preparation, and analytical procedures.

This guide defines the most commonly referenced filter paper specifications and explains the performance characteristics of CFP1 filter media.

Understanding Filter Paper Specifications

Filter Media

The filter media designation is a serialized nomenclature used to identify a specific filter paper product. The designation itself does not indicate relative quality, grade, or performance.

Furnish

Furnish refers to the raw materials used in manufacturing the wet-laid filter paper product.

The furnish composition influences:

• Filtration performance
• Mechanical strength
• Chemical compatibility
• Flow characteristics

Ash Content

Ash content is determined using a dry combustion method by exposing the material to approximately 900°C in a muffle furnace.

Ash content is often evaluated when:

• Purity is important
• Gravimetric analysis is performed
• Residue testing is required

Lower ash levels are generally preferred for analytical applications requiring minimal residual contamination.

Retention

Retention describes the nominal particle size removed by the filter media.

For Antarisz™ filter papers, retention specifications typically indicate:

• Particle size captured
• Approximately 98% filtration efficiency in liquid applications

Retention is one of the primary factors used when selecting a filter paper.

Flow Rate

Flow rate refers to the relative speed at which liquids pass through the filter paper.  Flow characteristics are typically compared against other filter media within the same product family.

Flow rate selection often involves balancing:

• Filtration speed
• Particle retention
• Sample throughput

Basis Weight

Basis weight represents the nominal weight of the filter paper per square meter.

This specification is reported as:  grams per square meter (g/m²)  at approximately 8% moisture content.

Basis weight often influences:

• Strength
• Thickness
• Handling characteristics

Thickness

Thickness is measured under controlled conditions using:  TAPPI Method T411  with approximately 4 psi applied pressure.

Thickness can influence:

• Flow properties
• Loading capacity
• Mechanical durability

Flat and Fluted Configurations

Antarisz™ filter papers are supplied in multiple formats.

Flat

Available as:

• Sheets
• Rolls
• Die-cut components

Fluted

Available as pre-folded:

• 1/4 quadrant
• 1/2 quadrant

Fluted papers are commonly used to increase filtration surface area and improve filtration speed.

Surface Characteristics

Surface characteristics describe the relative smoothness or texture of the paper compared to similar filter media within the product family.

Surface properties can influence:

• Particle capture
• Sample distribution
• Filtration consistency

Brightness

Brightness is a relative measure of the paper's appearance and whiteness when compared with similar materials.

Higher brightness may be advantageous for:

• Visual inspection
• Stain intensity measurements
• Optical detection methods

CFP1 Filter Paper Characteristics

General Purpose Laboratory Filter Paper

CFP1 is one of the most widely used Antarisz™ filter media grades because it provides an effective balance of particle retention and filtration speed.

Typical Performance

• Nominal particle retention: approximately 11 µm
• Medium flow rate
• Bright white appearance
• Broad application versatility

Common Applications for CFP1

CFP1 is frequently used for the filtration of:

• Lead sulfate precipitates
• Calcium carbonate precipitates
• Calcium oxalate precipitates

It is also commonly selected for:

• Agricultural testing
• Soil analysis
• Seed testing
• Environmental laboratories
• General laboratory filtration

Food and Beverage Applications

CFP1 is often used to separate liquids from solids in:

• Food testing laboratories
• Beverage analysis
• Process quality control

The balance of retention and flow makes it suitable for routine filtration applications where sample throughput is important.

Air Monitoring and Optical Methods

The consistent bright white appearance of CFP1 makes it useful for:

• Air sampling applications
• Photometric stain measurements
• Optical reflectance testing

The media may also be impregnated with chemical reagents for specialized detection methods involving:

• Gas monitoring
• Air quality testing
• Colorimetric analysis

Key Takeaways

• Antarisz™ filter paper specifications help define retention, flow rate, thickness, and performance characteristics.
• Retention values indicate nominal particle capture efficiency.
• Flow rate describes liquid filtration speed relative to comparable products.
• CFP1 provides approximately 11 µm particle retention with medium flow characteristics.
• CFP1 is widely used in laboratory, environmental, agricultural, food, and beverage applications.
• The bright white appearance of CFP1 also supports optical and photometric testing procedures.