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Gasket of Flexitallic Sigma 511 PTFE (FJ-2912D)

Sigma® 511 by Flexitallic® is made of biaxially-orientated PTFE containing silica. Colour: Pink

  • Standard compressibility
  • Strong acids (except hydrofluoric) to general chemicals
  • Can be used for all concentrations of sulfuric acid
  • Not suitable for molten alkali metals, fluorine gas or hydrogen fluoride

Sigma® 511 is suitable for sealing most chemicals across the whole pH range (0-14) with the exception of molten alkali metals, fluorine gas, hydrogen fluoride or materials which may generate these. FJ2912D is particularly suitable for use in applications involving strong acids.

  • Recommended temperature range: -250ºC to 260ºC
  • Recommended pressure range: Vacuum to 85 bar (1230 psi)        


  • WRAS Approved for use with potable water: Approval No. 1206528
  • TA-LUFT approved
  • BAM Oxygen
  • Tested in accordance to EC Regulation No. 10/2011*

*being the specific testing requirements of EN Regulation 1935/2004

Brand   Type / Style   Betech mat.ID  

Betech is Allied Distributor and solution partner for Flexitallic.

Flexitallic   Sigma 511   FJ 2912D


Typical Applications

(Application cannot be disclosed)

Quality (QA) & Pre-qualification

ISO 9001:2008
JQS Achilles (Oil & Gas)
Sellihca (Utillities)