Impregnation Services Ltd

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Established in 1964, Impregnation Services Limited has over 50 years’ experience in impregnating porous castings.  

Impregnation Services Limited is a family-run business, specialising in the vacuum impregnation process. The business was purchased in February 2008 by husband and wife team Justin and Rachael Benson, who led a management buy-in of the company from its previous owners.

For the past 15 years, ISL has seen a major re-investment in people, plant, and machinery, which has resulted in an improved casting porosity sealing service and overall quality. Through continual investment, coupled with a highly qualified and skilled team, ISL has been able to consistently provide its customers with an outstanding vacuum impregnation service.

With over 50 years’ experience in this specialist field of vacuum impregnation, ISL is able to offer both in-house and on-site porosity sealing services to a client base across the UK and globally.


ISL has worked with a range of sectors including automotive, marine, defence as well as valve manufacturers; using specialist resins to seal casting porosity. Whether it’s a single part, a production run of many thousands, or a specific application, ISL can solve your porosity problems.  For more information please contact a member of our team today.

Celebrating over 50 years of manufacturing excellence.


2021 – Impregnation launches Dot Peen Marking. Find out more here 

Winners of the Manufacturing category in the Made in the North West Awards 2019