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30 Minute Acoustic Fire Barrier Curtain


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A red, reinforced glass cloth 16.5mm thick impregnated with Envirograf intumescent material.

Available in 1220mm widths up to 40 metres long. Provides 30 minutes protection.

Envirograf Product 56

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Product Info

The curtain can be fixed to truss areas both timber and steel, or between concrete soffits and suspended ceilings etc.

Overlap the joints by 50mm and adhere with the adhesive supplied (one 310ml tube is supplied with orders up to 10m of curtain plus one extra tube for every additional 10m length or part thereof). The barrier can have doors and openings fitted.

A very robust material which can be used for drop curtains up to 10m.

It meets the airborne and impact sound reduction requirements of Document E of UK Building Regulations.

FB30AC has 15mm acoustic sponge adhered to the cloth but, for greater acoustic properties, sponge up to 20mm can be used. The barrier can also be used horizontally over a suspended ceiling to give more fire protection or between floorboards and a secondary floor.


The barrier can be fixed to steel, wood, and between concrete soffits and suspended ceilings with Envirograf metal straps (FB/ C1). The straps can be cut with metal snips or use FB/FP metal washers with intumescent-coated material on top.

Joints should be overlapped by 50mm and adhered with the supplied Envirograf adhesive. FB30 can be wrapped around steel, trunking, or wood as a fire barrier. If more insulation is required, see Envirograf Product 54. Lightweight and easy to install. Can be cut with a sharp knife.

Does not shed fibres – ideal for hospitals, ‘clean’ areas, and computer rooms.

Services can be passed through in conjunction with Envirograf Products 13 and 16. Openings can be made in the barrier for access fire doors, as shown above.

Fire Performance

Tested to BS476 Part 22 (1987), achieving 36 minutes integrity and 15 minutes insulation.

Tested over Class 0 suspended ceiling horizontally, achieving 22 minutes insulation to BS476 Part 22 (1987).

Tested to BS476 Parts 6 & 7 (1987) achieving Class 0 / Class 1.

Tested to BS476 Part 23 (1987) over light fittings, achieving 46 minutes integrity.


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