Astro FRA Socket Box Inserts (35mm Deep)

The Astro FRA Socket Box Insert from Astroflame (Fireseals) Ltd is a pre-formed mineral fibre liner that drops into a single or double electrical back box to reinstate the fire and acoustic performance of a plasterboard partition. It is sold as an alternative to intumescent putty pads, fitting in seconds with no assembly, adhesive or mess, and it suits both plastic and metal back boxes. The 35mm deep version is the standard size, with a 47mm extra deep version available for deeper boxes.

• Halogen free, low smoke, fire resistant mineral fibre, nominally 4mm thick
• Single 35mm insert is 70mm wide x 70mm high x 35mm deep; the double is 140mm wide x 70mm high x 35mm deep
• Suitable for retrofit as well as new work, with a declared 48 year working life