Ahlstrom-Munksjö is a manufacturer of laboratory filter paper and other fiber-based materials, supplying innovative and sustainable solutions to customers worldwide in a variety of industries, recognized for providing superior service, reliability and high quality products. Production facilities in North America allow for easy access to custom sizes in addition to standard offerings.

Qualitative Filter Paper

Qualitative filter papers are often used in routine separation work that requires high purity and consistent performance.

These filter papers cover a wide range of laboratory applications, such as: liquid clarification, qualitative analytical separation for precipitates and buffer filtration, soil analysis, and food and beverage testing.

  • High content of alpha-cellulose providing high purity
  • Circles, folded filter and sheets forms with various sizes are available
  • Custom cuts available

Standard qualitative filter papers are suitable for quadrant folded or gravity flow applications. Wet-strengthened grades are also available.

Popular Alternate Options
Competitor GradesAhlstrom-Munksjo Grade 
619 de610


Quantitative Filter Paper

Our quantitative filter papers are manufactured from high quality cotton linters using pure water and are further treated with dilute acid to remove any remaining organic and inorganic impurities.

Our filter papers are suitable for routine gravimetric analysis and typical preparation of samples for use in analysis involving instrumental techniques.

All Ahlstrom-Munksjö quantitative grades are manufactured in a strictly controlled environment that ensures high uniformity and high purity from filter to filter.

  • High wet-strength
  • Consistent performance
  • Custom cut
Popular Competitive Grades
Competitor GradesAhlstrom-Munksjo Grade 
640 d391
640 m392
640 w388

Total and Volatile Solids Testing

Ahlstrom-Munksjo offers binder-free microfiber glass filters suitable for use in gravimetric analysis involving ignition of the sample. These filters are also effective for measuring solids in water. Grade 169 is an alternative to Whatman 934-AH that is designed for Volatile Solids Testing and formulated specifically to maintain a stable weight at 550 deg C and show similar handling characteristics before and after 30 minutes in a 600 deg C furnace. Grade 161 is an economical alternative for Total Solids Testing that was previously known as E-D 161.

  • Recommended for Standard Test Methods 2540C, 2540D, and 2540E
  • Fine particle retention with high sample loading
  • Customizable sizes and packaging
STM 2540
TSS < 550°CGrade 161
VSS > 550°CGrade 169
Also try Grade 169 in 47mm pre-washed and pre-weighed

Quartz Filter Paper

Ahlstrom-Munksjo offers two quartz products for a complete offer for airborne particulate monitoring in high temperature and aggressive atmospheres or for high purity in analysis.

Grade MK 5 - Air Monitoring Quartz Filter
Ahlstrom-Munksjo offers a new grade of high-purity binder-free quartz suitable for air monitoring applications in high temperatures and aggressive atmospheres or when low levels of trace elements are required. Grade MK 5 can be used up to 500°C.

Grade MK 360 - 100% High Purity Quartz Filter
This 100% quartz microfiber filter is available for applications requiring extremely low levels of trace elements or media that can withstand temperatures between 500°C and 900°C.

Popular Competitive Grades
Maximum TemperatureAhlstrom-Munksjo Grade 
500°CMK 5
900°CMK 360