Contact Us


The Flexitallic isolation system, an insulation gasket to provide electrical and thermal insulation using Sigma® and Thermiculite® technology.

Flexitallic provides a complete product range to limit corrosion in pipeline systems, using modified PTFE material Sigma® and their unique high temperature material Thermiculite® - both giving unrivalled performance. The insulating sets are designed to electrically isolate flanges and bolts in cathodically protected piping systems or whatever dissimilar metals are present.

The specially engineered materials used in the I-Flex isolation system are also able to extend traditional operating temperature pressures and chemical compatibility, seen with current insulation technology.

Engineered and manufactured in the UK
Available as individual gaskets and full isolation set
Widest possible temperature range -200°C to 1000°C
Service pressure range from vacuum, to class 2500
Can be used on all types of flanges
Used for both cathodic and galvanic corrosion

Return to Flexitallic Products >

Contact William Johnston & Company Limited

For more information about our Flexitallic products and services that are available world wide, contact us on +44 (0)141 620 1666, Email us or simply complete our online Enquiry Form.

Failure to select the correct materials or products can result in damage to plant and equipment and personal injury. In specific applications, particularly where critical conditions exist, we suggest you contact us and we will consider with you the most suitable material or product. However, information supplied by William Johnston & Company Limited is intended only as technical co-operation and as a guide to the various uses of different products. No warranty is given in respect of information or recommendations by William Johnston & Company Limited which are only given for guidance and without any guarantee. The customer must satisfy themselves on the suitability of the material or product for the intended purpose. The correct fitting of products is the responsibility of the customer.

William Johnston Accreditation