• Fibers: A wiper is washed in water using a biaxial shaker for five minutes. The fibers released into the water are filtered onto a membrane and counted microscopically. The results are expressed as fibers ≥ 100µm per square centimeter of wiper. (IEST-RP.CC004.3, Section 6.2.2.2)
• Particle Generation - Biaxial Shake Test: A wiper is "washed" in water using a biaxial shaker for five minutes. The particles released into the water are counted by a liquid-borne particle counter. By dividing the total number of particles released by the area of the wiper, the results are expressed as particles ≥ 0.5µm per square centimeter of wiper. (IEST-RP.CC004.3, Section 6.1.3)

Absorbency

• Absorbency : A sample piece of material is saturated with as much fluid as it can hold. After one minute, the material is weighed, and results are expressed in cubic centimeters of fluid per square meter. (IEST-RP.CC004.3, Section 8.1 - modified)
• Specific Absorbency: This calculation indicates how well a material absorbs, relative to others. Results, expressed in cubic centimeters of liquid per gram of material, assist in comparing one raw material with another. (IEST-RP. CC004.3. Section 8.1 - modified)
• Time to Half-Sorption: This test is a measurement of the time it takes a wiper to absorb half the total liquid it can hold. Results are expressed in seconds. (IEST-RP. CC004.3. Section 8.1 - modified)

Purity

• Extractables : Berkshire generates extraction data using both deionized water and 2-Propanol. Results are expressed in percent by weight (the percent of material left behind as non-volatile residue) which is a useful guide to relative purity of wipers. (Dry wipers utilize IEST-RP.CC004.3, Section 7.1.1, presaturated wipes utilize IEST-RP.CC004.3, Section 7.1.2)
• Metallic Ions : Ions are extracted in deionized H₂O and quantitatively analyzed by Ion Chromatography . Results are stated in parts per million (ppm). .(IEST-RP.CC004.3, Section 7.2.2.)