Interdens 1mm AV2/AV3 Multi-Point Lock Protection Kit is a pre-cut intumescent protection system designed for compatible AV2 and AV3 multipoint locks and their associated keeps in fire-resisting timber doorsets.
The kit provides intumescent material around the recessed lock and keep locations, helping protect areas where timber has been removed to accommodate the multipoint locking system.
Each product is supplied as one complete kit in a fixed specification:
A multipoint lock requires recesses and routing within the edge and face of the door leaf. Additional recesses may also be required in the frame for the associated keeps.
These machined areas can reduce the amount of timber surrounding the locking system and create vulnerable locations within a fire-resisting doorset.
The Interdens kit is intended to provide protection around the compatible lock and keep components where required by the doorset or hardware evidence.
During fire conditions, the intumescent material expands to help:
Norseal describes the product as an AV2/3 universal kit for locks and keeps.
The term universal relates to the supported AV2 and AV3 lock family. It must not be interpreted as meaning that the kit is suitable for every multipoint lock from every manufacturer.
Before ordering, confirm:
The kit is manufactured from 1mm Interdens, a low-pressure intumescent material used to protect ironmongery within fire-resisting doorsets.
Interdens remains thin and discreet during normal use. When exposed to elevated temperatures, it expands into available spaces around the protected components.
Norseal describes Interdens as activating at approximately 180°C and expanding substantially under fire conditions.
The low-pressure expansion characteristic makes it suitable for closely fitted hardware locations where controlled intumescence is required around metal lock components and timber recesses.
The individual kit sections incorporate self-adhesive backing to assist positioning during installation.
The adhesive helps hold each section in its intended location while the lock, forend and keep components are refitted.
The adhesive is an installation aid only. It does not replace:
The kit is supplied with pre-cut intumescent sections for the compatible AV2/AV3 lock and keep arrangement.
Using a prepared kit helps:
Identify and dry-position every section before removing the adhesive release liners.
Do not discard, trim, overlap or substitute pieces unless this is expressly permitted by the current fitting instructions or supporting doorset evidence.
Norseal identifies its Interdens lock kits for lock and latch locations within fire-resisting doorsets, with fire resistance in accordance with BS 476-22.
The kit does not independently provide an FD30, FD60 or other fire-resistance classification.
Performance depends on the complete assembly, including:
The exact kit arrangement used during testing or assessment must be reproduced on the installed doorset.
Where an AV2 or AV3 lock is removed for maintenance or replacement, inspect the existing intumescent protection before refitting the hardware.
Replace the kit where the material is:
Changing the multipoint lock without reinstating the required intumescent protection can affect the evidence for the complete fire door.
This kit is designed to provide intumescent fire protection around compatible multipoint lock hardware.
It should not be assigned:
Before ordering, confirm:
| Product Name | Interdens 1mm AV2/AV3 Multi-Point Lock Protection Kit |
| Product Code | INT/1/AV2/3KIT |
| Manufacturer Description | AV2/3 Universal Kit for Locks and Keeps |
| Product Type | Pre-cut intumescent multipoint lock protection kit |
| Application | Compatible AV2 and AV3 lock and keep locations within fire-resisting doorsets |
| Material | Interdens |
| Thickness | 1mm |
| Colour | White |
| Fixing | Self-adhesive backing, retained behind the mechanically fixed lock and keep components |
| Expansion Characteristic | Low-pressure intumescent expansion |
| Published Activation Temperature | Approximately 180°C for Interdens material |
| Fire-Test Standard Referenced | BS 476-22 |
| Unit of Sale | One complete kit |
| Lock Included? | No |
| Keeps Included? | No |
| Fixing Screws Included? | No |
| Standalone Fire Rating? | No — performance belongs to the complete tested or assessed lock and doorset arrangement |
| Standalone Smoke Rating? | No |
| Standalone Acoustic Rating? | No |
| Lock Type | Thickness | Material | Product Code |
|---|---|---|---|
| AV2/AV3 multipoint lock and keeps | 1mm | Interdens | INT/1/AV2/3KIT |
| Lock Options | Thickness Options | Material Options | Total Variations |
|---|---|---|---|
| AV2/AV3 | 1mm | Interdens | 1 |
The kit should only be selected where the supporting evidence permits:
The phrase “universal kit” applies to the supported AV2/AV3 arrangement. It does not indicate compatibility with all multipoint locks.
One ordered item contains one complete AV2/AV3 protection kit.
Normally, one complete kit is required for each compatible lock installation, subject to the applicable hardware and doorset specification.
Do not divide one kit between multiple doors or omit sections that appear unnecessary without supporting evidence.
Do not install a kit where any section is:
The AV2/AV3 protection kit must be installed in accordance with the current lock-manufacturer instructions and the evidence for the complete fire-resisting doorset.
The exact number, shape and position of the supplied sections must be reproduced as specified. Do not rely on a generic multipoint-lock installation where project evidence requires another arrangement.
Before installation, confirm:
Do not replace the specified kit with loose intumescent sheet or a differently shaped lock kit without supporting evidence.
Lay out all supplied sections on a clean surface.
Check that:
Machine the door and frame only in accordance with the lock and doorset instructions.
The recesses should be:
Do not enlarge or deepen the recesses beyond the permitted dimensions.
Remove all machining dust and loose material with a suitable brush or vacuum.
The surfaces receiving the adhesive-backed Interdens must be clean and dry.
Do not install the material over:
Dry-position the supplied sections against their corresponding lock and keep locations before removing any release liner.
Confirm that each section:
Do not assume that visually similar pieces are interchangeable.
Remove the release liner from the relevant lock-side section without touching or contaminating the adhesive.
Align the material within the specified recess and press it firmly into position.
Ensure that:
Repeat the process for the remaining lock-side sections in the arrangement required by the current fitting instructions.
Position the AV2 or AV3 multipoint lock over the installed protection.
Insert the lock carefully so that the Interdens sections are not:
Secure the lock using the fixings specified by the lock manufacturer and doorset evidence.
Identify the intumescent sections intended for the frame keeps.
Dry-fit each piece before removing its adhesive liner, then press it into the required keep recess.
Confirm that:
Install the keeps using the specified screws and alignment procedure.
Operate the lock carefully and confirm that all locking points enter their keeps without:
Operate the door and multipoint lock several times.
Confirm that:
Verify that:
Inspect the multipoint lock as part of the routine fire-door inspection programme.
Check for:
Whenever the lock or keeps are removed or replaced, inspect and reinstate the complete specified intumescent kit.
The Interdens AV2/AV3 kit does not independently provide a fire-resistance period.
Performance depends on the complete approved doorset, compatible multipoint lock, keep arrangement, Interdens kit, mechanical fixings and installation quality.
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