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FAQs

Intumescent Mastics & Sealants

Can I add architraves over FAS Fire Door Intumescent Acrylic Sealant?

Architraves are optional, FAS Fire Door Intumescent Acrylic Sealant has been tested with and without.

What is fire mastic used for?

Fire mastic seals gaps in walls and joints to prevent fire and smoke spreading. Always check your certfcation and use tested solutions suiatble for your application.

Does FAS Fire Door Intumescent Acrylic Sealant have a shelf life?

FAS Fire Door Intumescent Acrylic Sealant has an 18-month shelf life whilst stored unopened in temperate conditions (5°C > 30°C).

How long does fire mastic take to cure?

Depending on product and conditions, curing usually takes 24 to 48 hours.

How much will a 310ml cartridge or 600ml foil sausage seal?

310ml cartridge will produce approximately 1m using a 20mm x 15mm bead.
600ml foil sausage will produce approximately 1.8m using a 20mm x 15mm bead.

Is fire mastic waterproof?

Some fire mastics may be water-resistant once cured, however, it is always recommended to check the datasheet. Where high levels of moisture are anticipated or the installationis external, we would recommend using a silicone based sealant.

Does FAS Fire Door Intumescent Acrylic Sealant have an acoustic rating?

Yes, FAS Fire Door Intumescent Acrylic Sealant has sound reduction capabilities of up to 55dB Rw.

Can I paint over fire mastic?

Yes, once dry, most fire mastics can be painted over, check your product datasheet for further information.

Can I use FAS Fire Door Intumescent Acrylic Sealant when doorsets are required to have smoke control?

Yes, FAS Fire Door Intumescent Acrylic Sealant has smoke leakage evidence to BS EN 1634-3: 2004.

Why use Fire Door Foam™ instead of stone mineral fibre wool as backing for FAS Fire Door Intumescent Acrylic Sealant?

Fire Door Foam™ installation saves time and money against traditional mineral fibre wool methods.

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