PTAS - About Us

Our People

Andrew Chalmers - Managing DirectorPhoto of Andrew ChalmersView Andrew Chalmers's profile on LinkedIn

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

A Physicist by profession (CPhys, MInstP) and Engineer (MIET) by training, Andrew has over 25 years experience in the development and validation of purification products and systems for both liquids and gases, gained at World leading manufacturers.

As long time developers of mechanical and chemical based purification products, we can bring experience of actually working with both a range of analysis technologies and number of equipment suppliers. The conversion from a process measurement requirement into an implementation of an effective robust measurement system has many potential pitfalls, which we can help minimise. Having also worked with Medical and Pharmaceutical applications such as Medical Vacuum, Medical Compressed air and sterilising grade filtration of drug products we can assist with validation of process and equipment.

Stephen Smith - Technical DirectorPhoto of Stephen SmithView Stephen Smith's profile on LinkedIn

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 Stephen accepted the role of Technical Director at FIL.

As a recent 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


PALAS GmbH LogoFilter Integrity Ltd. is a UK sales partner of PALAS GmbH and so now offers their wide range of aerosol generation, characterisation, customised test systems and aerosol science know-how into the UK aerosol science market.


Organisation Membership

Aerosol Society LogoWe also hold either corporate or individual memberships in several influential UK organisations with an involvement in particle and aerosol science such as the Aerosol Society, the Institue of Physics (IOP) and the Filtration Society and we are also a subscribing member of the British Standards Institution (BSI).


NETPark LogoAs a member of NETPark, one of the fastest growing Science Parks in the UK and through their Innovation Support Network, NETPark Net, Filter Integrity Ltd. can call on personnel and organisations to support its activity, including from the five local universities of Durham, Newcastle, Northumbria, Sunderland and Teesside which are all important stakeholders in NETPark.