All ironmongery installed on a fire door must be fitted without compromising the integrity of the complete fire door assembly. This is of particular importance where ironmongery is rebated into the doorset such as hinges, locks, latches and concealed door closers.

Interdens® is a phosphate based fire protection that has gained a first-class reputation through the outstanding expanding capabilites and the excellent insulating properties of the resultant foam. Foam expansion occurs without pressure.

Interdens® has been tested extensively to protect rebated ironmongery in fire doors for over 30 years, this includes testing to both BS476 & EN1634 to 30 & 60 minute fire rating. Typically 1mm material is used for 30 minute applications and 2mm material for 60 minutes however always refer to the manufacturers test evidence or Certifire certification for reference.

For data sheets, test reports and more information please copy and paste this link into your browser: https://www.astroflame.com/interdens.html