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Intumescent Strips for Fire Doors
Intumescent strips, also known as fire door seals, are cleverly designed to be installed in, (via a pre-routed groove in the fire door from manufacture), or can be surface-mounted on fire-rated doors to aid the reduction of smoke and fire. When a fire occurs, smoke can ‘seep’ through the small gaps often found around the edges of the door into the adjoining escape routes reducing a safe evacuation. Some intumescent strips are supplied with an additional brush which increases the reduction of cold smoke from filling your escape routes before occupants have a chance to evacuate.
All our fire door seals are available in kits for single and double fire doors, and resist fire for up to either 30 or 60 minutes (FD30 or FD60 fire doors). The seals can either be fitted in the frame, or direct application to the door leaf by self-adhesive strips.
Surface-Mounted Fire Door Seal Kits - 25mm - Fire and Smoke
- Retrofit fire door seals
- Suitable if no rebate for seals exists in the fire door
- Intumescent strip plus smoke brush
- 1050mm long in packs of 5 (single door) or 8 (double door)
- 30 minute fire and smoke (FD30s)
Rebated Fire Door Seal Kits - 10x4mm - Fire Only - Astroflame
- For rebated fire doors and frames
- Non-brush fire only seals (4mm x 10mm)
- 30 minute fire rating (FD30)
- 1050mm lengths in packs of 5 (single door) or 8 (double door)
Rebated Fire Door Seal Kits - 15x4mm - Fire Only - Astroflame
- Designed for rebated fire doors and frames
- Non-brush fire only seals (4mm x 15mm)
- 30 minute fire rating (FD30)
- 1050mm lengths in packs of 5 (single door) or 8 (double door)
Rebated Fire Door Seal Kits - 20x4mm - Fire Only - Astroflame
- Non-brush fire only seals (4mm x 20mm)
- 60 minute fire rating (FD60)
- 1050mm lengths in packs of 5 (single door) or 8 (double door)
- For rebated fire doors and frames
Rebated Fire Door Seal Kits - 25x4mm - Fire Only - Astroflame
- Non-brush fire only seals (4mm x 25mm)
- 60 minute fire rating (FD60)
- 1050mm lengths in packs of 5 (single door) or 8 (double door)
- For rebated fire doors and frames
Rebated Fire Door Seal Kits - 10x4mm - Fire and Smoke - Astroflame
- For rebated fire doors and frames
- Fire and Smoke Seals (4mmx10mm)
- 30 minutes fire and smoke (FD30)
- 1050mm lengths in packs of 5 (single door) or 8 (double door)
Rebated Fire Door Seal Kits - 15x4mm - Fire and Smoke - Astroflame
- For rebated fire doors and frames
- Fire and Smoke Seals (4mmx15mm)
- 30 minutes fire and smoke protection (FD30)
- 1050mm lengths in packs of 5 (single door) or 8 (double door)
Rebated Fire Door Seal Kits - 20x4mm - Fire and Smoke - Astroflame
- Fire and smoke seals (4mm x 20mm)
- 60 minute fire rating (FD60 / FD60S)
- For rebated fire doors and frames
- 1050mm lengths in packs of 5 (single door) or 8 (double door)
Rebated Fire Door Seal Kits - 25x4mm - Fire and Smoke - Astroflame
- Fire and smoke seals (4mm x 25mm)
- For rebated fire doors and frames
- 1050mm lengths in packs of 5 (single door) or 8 (double door)
- 60 minute fire rating (FD60 / FD60S)
Surface Mounted Drop Down Smoke Seal
- Suitable for gaps of up to 14mm
- No rebating necessary - ideal for retrofitting
- Available in a range of lengths: 330mm - 1030mm
- Supplied complete with fixing screws
Rebated Drop Down Smoke Seal
- Suitable for gaps of up to 14mm
- Lightweight aluminium and PVC construction
- Available in a range or lengths: 330mm - 1230mm
- Pre-fitted with fixing screws
Astroflame Door Edge Guards - Rounded
- 30 and 60 minute fire rated versions
- Impact tested to 200kg at 3.5mph
- Tested to BS 476-22:1987
Astroflame Door Edge Guards - Flat
- 30 and 60 minute fire rated versions
- Impact tested to 200kg at 3.5mph
- Tested to BS 476-22:1987
Intumescent Ironmongery Protection for Fire Door Hinges - Astroflame
Intumescent backing material for use when fitting fire rated hinges to your fire doors and frames, sealing any gaps to help prevent the spread of fire and smoke.
- Dimensions (L x W x D): 100 x 30 x 0.8mm
- Suitable for use on FD30 and FD60 fire doors
- Supplied in packs of 6 (single door) or boxes of 300
- Available with square or rounded corners to match most hinges
Fire Door Gap Gauge
- Check your Fire Door installations for compliance
- Lightweight construction
- Durable design
- Easy to use
What are intumescent strips?
How intumescent strips work
Types of intumescent strips
What are intumescent strips?
Fire doors are designed in such a way that it creates a barrier, compartmentalising a section or part of a premises, preventing smoke and fire from travelling though one part of the building and quickly onto another. When fire doors are installed correctly, small gaps can be seen between the door and frame which could impair the fire door’s ability to prevent the spread of fire and smoke. Intumescent strips, or intumescent seals, are heat activated seals that are placed on either the edge of the door or the frame to essentially fill these gaps for the event of a fire.
How intumescent strips work
Intumescent strips contain a heat reactive chemical that causes it to swell up when exposed to these conditions, typically in the event of a fire. Activating at around 200°C, the intumescent strips expand to many times its original size, in order for it to “seal” the gap around the door. This in turn, ensures that fire and smoke cannot lip itself around the door and occupy the escape route, making it difficult to escape.
Smoke seals, also known as cold smoke seals, have a distinctive feature of an additional brush that fits around the edges of the door and is usually combined with an intumescent strip. The brush is designed in such a way that even when the fire has not reached the intumescent seals activation temperature, the brush will reduce the amount of smoke that can lip itself around the door, keeping the escape route as clear as possible for as long as possible to not hinder evacuation.
Types of intumescent strips
Intumescent strips are often supplied in either rebated or surface mounted options. Rebated strips can often be found in brand new doors, as a channel is often routed out during manufacture to allow for the strip to be installed when it is being fitted. As the routing is done at the manufacturing stage of the door, it does not void its fire rating. Surface mounted intumescent strips are a solution to replace damaged strips on older fire doors or to be retrofitted on doors that did not originally have seals installed. Intumescent strips are only installed on the top and sides of fire doors, different seals can be fitted to the bottom of the door, should these be required.
Intumescent seals prevent the spread of fire but you may also need smoke seals, in addition to also prevent the spread of toxic smoke. Your fire door inspector, or fire risk assessor, will be able to advise you on which type or types of seals you require for your fire door needs.
Fire Only – Intumescent seals are for use where no smoke seals are required. These are likely to be used for doors that are for a small side room, such as a broom cupboard without a fire alarm, which in turn leads to a corridor with automatic fire detection. On this occasion, it is important that the door allows for the cold smoke to leak from the cupboard into the corridor so that the fire alarm is able to be activated and alert the occupants to the fire.
Fire and Smoke – Fire and smoke seals create a safe and effective barrier against fire, cold smoke, and hot gases produced in a fire. The smoke seal, in particular provides a permanent barrier to toxic smoke, which may impede an individuals’ ability to effectively escape via the emergency routes. This is particularly important as it is key to know that smoke fumes travel faster and further than the fire itself, causing more harm to an individual.