Selleys FlameFlex High Performance Sealant can be used for construction joints & gaps where a fire rated seal is specified*, and can be used for construction joints for walls, windows & doors in bushfire prone areas^.  It can be used where an acoustic rated seal is needed.  


  • Fire rated up to 4 hours*(AS1530.4)
  • Fire rated up to BAL-FZ^ (AS3959)
  • Complies with BCA acoustic requirements*
  • No primer required on most surfaces~
  • Adhesion to wet or damp surfaces
  • Low VOCΔ
  • Sandable when fully cured
  • 10 year water tight seal guarantee**

Where can this product be used?

  • Construction joints & gaps 
  • Construction joints for walls, doors & windows
  • Doors

What materials is this product suitable for?

  • Concrete
  • Brick
  • Timber
  • Plaster
  • Cement sheeting
  • Metals
  • Most plastics (Pre-test before use. Not for polyethylene, polypropylene or Teflon.)

Please contact your store to confirm avaliability, as some stores may have a limited range.

Size 435g Cartridge
Colours Grey
Technology Sil-X®
Use  Interior 

 FlameFlex is not suitable for use in applications exposed to continous temperatures greater than 80 degrees celcius.  DO NOT use to seal around ovens, chimney flues, pizza ovens etc.

  1. Ensure substrates are clean and free of oil, grease or loose particles by wiping with a cloth dampened with mineral turps.
  2. Cut seal and nozzle and fit to cartridge, then place in caulking gun, such as Selleys Light Speed caulking gun.
  3. Hold caulking gun at 45° angle and gun sealant ahead of nozzle ensuring product is pushed into joint.
  4. Tool with a soapy solution before skinning occurs. For optimal joint design, use non-absorbent backing material (e.g. polyethylene backer rod) and appropriate joint width/depth. See technical data sheet for more information. 


  • Not suitable for PE, PP or PTFE 


  • In dry conditions, surfaces can be misted with water to speed up cure.
  • Paintable with water-based paint, after product skins.  Solvent-based paints may be used after first painting with a water-based paint.  Some paints may require sealant to be sanded lightly before painting.

       Warranty Information

  • **Refer to product label for full conditions. This guarantee does not limit and may not necessarily exceed your rights under the Competition and Consumer Act 2010

         Additional Information

  • * Fire rating depends on substrate & joint dimensions - contact Selleys for more specific information on fire and acoustic rated installations.
  • ^ Fire rated up to BAL-FZ for walls/windows/doors in in properly configured joints as specified in the TDS - contact Selleys for more specific information on BAL rated installations.
  • ~ Prime cement sheeting before applying Selleys FlameFlex.
  • ΔMeets GBCA limits for general purpose and architectural sealants.



  • Uncured product can be removed with mineral turps.
  • Cured product can be removed with Selleys Silicone Remover or by mechanical action.

Related Products

Selleys Butyl Mastic

Selleys Butyl Mastic is a synthetic resin, butyl rubber based mastic which forms a smooth tough skin, but remains permanently plastic underneath.

Selleys FlameFlex

Selleys FlameFlex High Performance Sealant can be used for construction joints & gaps where a fire rated seal is specified*.

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