PTR Filters

For sterilizing process gas applications and tank vents.

  • Tank Vents
  • Compressed Air
  • Pressurized Gases
  • Fermentation Air
Features and Benefits

PTFEPTR Filters are a family of validated Polytetrafluoroethylene (PTFE) membrane products for the sterilization  of process gas applications and tank vents.


  • High air flow and low pressure drops
  • Individually integrity tested using the water intrusion method
  • 25+ steam sterilization cycles
  • 0.22 micron pore size
Filtration Area

PTR filtration area

View Data Sheet for further product information:
  • Integrity test specifications
  • Materials of construction
  • Operating parameters
  • Sanitization and sterilization
  • Regulatory & compliance

PTR Filters

PTR/HT Filters


PTR cartridges are validated using test procedures that comply with the intent of BFE aerosol efficiency protocols for the determination of bacterial retention in filters used for air and gas filtration. The challenge level for the 0.22µm filter membrane is 7.5 x 107 organisms per cm2 of filter media of Brevundimonas diminuta (ATCC 19146). 

PTR filters are also validated using test procedures that comply with ASTM F 838-15(ae1) protocols for the determination of bacterial retention in filters used for liquid filtration. The challenge level is a minimum of 107 Brevundimonas diminuta organisms per cm2 of filter media. CPF filters have > 7-log removal when challenged with the Brevundimonas diminuta (0.22µm meets the FDA definition of sterilizing grade filters). Validation Guides available upon request.

Quality Assurance

PTR filters are 100% integrity tested. CPF filters are developed and manufactured under an ISO 9001:2015 certified Quality Management System and designed to be used in cGMP-compliant processes. 

PTR Cartridges 

Available from 5-40 inches in length with several end connections and O-ring options. For applications using elevated temperatures,  PTR/HT Cartridges can be used in processes up to 221°F. 

PTR cartridge        Critical Process Filtration black and white capsule with etched logo 

PTR Capsules

These filters are PTR cartridges encapsulated in a polypropylene shell to minimize exposure to process fluids. A popular choice for single-use applications and can be disposed of easily. Sizes range from 2-30 inches in length. 

PTR capsule        Critical process black and white capsule with cutout to show cartridge etched logo 

Why Choose Critical Process Filters?

Quality & Performance
  • Over 20 years of engineering and manufacturing the finest filters for critical applications. 
  • Compliance with industry standards required for your operation
  • Product optimization to meet your performance goals
  • ISO 9001:2015 certified Quality Management System
  • Appropriately rated clean room environment
  • Proven success in pharmaceutical and bioprocessing applications
FAST and Reliable Delivery
  • Products ship in weeks, not months
  • Greater than 98% of products ship as promised
Price Advantage

It's simple. Our products are very competitively priced. Learn more

Services & Support
  • Presales evaluations/recommendations by highly experienced Application Engineers 
  • Post sales support and trouble shooting
  • Testing & Analysis services (our site or yours)
  • Validation Services

Made in USA 800   90012015Large-(1)

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