PTCA - About Us

Our People

Andrew Chalmers - Managing DirectorPhoto of Andrew Chalmers

Filter Integrity Ltd. was formed in 2010 and is headed by Andrew Chalmers.

A Physicist by profession and Engineer by training, Andrew has over 25 years experience in the development and validation of compressed air treatment products and systems gained at World leading manufacturers. As both a leader and member of product development teams at;

  • Process Scientific Innovations Ltd. (now PSI Global Ltd.)
  • domnick hunter Ltd. (now part of the Parker Hannifin Group)
  • Most recently, as Group Technical Manager at Walker Filtration Ltd.

Andrew was responsible for the development and launch of a wide range of treatment products and systems including:

  • Award winning and market leading PSA, membrane and catalytic conversion based gas drying and gas separation products for industrial and laboratory use.
  • Microporous membrane and microfibre based liquid and gas filtration products.
  • Filter Housings and other hardware meeting global pressure vessel certification requirements to 350bar (5000psi).
  • PEM based hydrogen generating systems.
  • Ranges of integrity test equipment for in–situ validation of sterilising grade pharmaceutical filtration products.

Andrew has also been a member of key industry technical committees, including the International Standards Organisation´s ISO TC118 SC4, responsible for Compressed air purity specification and compressed air treatment equipment. Standards developed by this committee include the ISO 8573 series relating to compressed air quality, ISO 12500 series relating to compressed air treatment equipment performance testing and the ISO 7183 standard specifically relating to compressed air dryer performance testing.

The Pharmaceutical and Medical sectors have very specific requirements for sterilisation of air and gases used in manufacture and treatment. Andrew was a member of the PDA Technical Committee reviewing guidlines for sterile air filtration and was an inaugural member of the UK Parenteral Society´s Sterile Filtration standards committee.

Stephen Smith - Technical DirectorPhoto of Stephen Smith

Stephen joined FIL in January 2014 bringing over 30 years of experience gained operating with a major multi-national where he lead a team in the specification, development and testing of filter medias and filtration products. In May 2016 Stehpen accepted the role of Technical Director at FIL.

Currently holding the position of Convenor of the ISO Technical Committee TC118 responsible for the development and maintenance of quality standards associated with compressed air filtration, Stephen will be well known to the filter development community and is looking forward to engaging with development colleagues.

He can be contacted on direct dial +44 1740625283 or

Other Partners and Contacts

Filter Integrity is linked with leading scientific organisations and consulting partners based in the North East of England, including five local universities and test equipment suppliers.

With compressed air industry contacts located around the world, Filter Integrity can call on personnel and organisations to support its activity in a wide range of areas and locations.