Norsound NOR789 Acoustic Flex PVC Hytrel Seal – 2100mm is a flexible acoustic door-sealing profile designed to help restrict airborne sound, draughts, light and uncontrolled airflow through gaps around a suitable doorset.
The product combines a flexible PVC profile with a resilient Hytrel sealing element.
When correctly positioned, the flexible sealing element contacts the opposing door or frame surface as the door closes. This helps reduce the open air path through which sound and air can pass.
Each seal is supplied as one fixed 2100mm black length.
The NOR789 is listed within the acoustic perimeter-seal range and is intended to form part of a complete door-sealing system.
Depending on the approved profile arrangement, an acoustic perimeter seal may be used around:
The precise installation position must be confirmed from the applicable product information and doorset specification before fitting.
A door leaf may provide substantial resistance to airborne sound, but gaps around its perimeter can create direct leakage paths.
Sound can pass through relatively small openings between:
The NOR789 helps treat the specified perimeter gap by creating flexible contact between the moving door and the opposing sealing surface.
For an effective acoustic arrangement, the complete perimeter should be considered rather than treating only one section of the door.
The PVC component provides a flexible body capable of following the door or frame perimeter.
Depending on the manufactured cross-section, the PVC section may act as:
The physical profile should be inspected before installation to establish its correct orientation and fixing arrangement.
Hytrel is a thermoplastic copolyester elastomer designed to combine flexibility with mechanical durability.
Within a door-sealing profile, a Hytrel element can provide resilient contact that flexes as the door closes and recovers when the door opens.
Material characteristics associated with Hytrel include:
The specific performance of the NOR789 depends on the grade, profile geometry and complete product construction selected by the manufacturer.
The sealing element is positioned so it contacts an opposing surface when the door reaches its closed position.
Depending on the profile design, the element may work through:
The exact action should be identified from the physical profile before installation.
Correct contact helps restrict the air path around the door without creating excessive resistance to opening or closing.
The NOR789 is intended for acoustic perimeter-sealing applications.
An individual strip does not have a universal standalone decibel rating.
Final acoustic performance depends on the complete door assembly, including:
Any numerical sound-reduction rating should be attributed only to the complete tested doorset arrangement to which it applies.
The NOR789 should generally be treated as one component within a complete acoustic door system.
An appropriate system may include:
Leaving the threshold or another section of the perimeter untreated can significantly reduce the performance of the overall system.
The flexible contact created by a perimeter seal may help reduce airflow around a closed door.
However, no current NOR789-specific smoke-test report or certification has been located.
The product should not be described as a certified smoke seal unless current evidence confirms:
Where certified smoke control is required, obtain current evidence before specifying or installing the product.
The NOR789 should not be treated as an intumescent fire seal.
No NOR789-specific fire-resistance evidence has been identified within the currently available technical information.
Where installation is proposed on a fire-resisting doorset:
The NOR789 does not independently provide an FD30, FD60 or other fire-resistance classification.
The current supplied NOR789 range contains one colour:
Black
The black finish can provide a discreet appearance against:
No Brown, Grey or White NOR789 product codes are listed within the supplied range.
Each seal is supplied as one:
2100mm length
The profile may be cut to the required doorset dimensions, subject to the manufacturer’s cutting and fitting guidance.
The quantity required depends on:
Measure the complete doorset before calculating the number of lengths required.
Subject to confirmation of the profile arrangement, potential applications can include:
The product must be compatible with the door construction and performance specification for the project.
Before ordering or installing, confirm:
Do not substitute the NOR789 for another perimeter profile solely because its length or colour appears suitable.
Norsound NOR789 Acoustic Flex PVC Hytrel Seal is a black, flexible acoustic door-sealing profile combining PVC with a Hytrel sealing element.
| Product Name | Norsound NOR789 Acoustic Flex PVC Hytrel Seal – 2100mm |
| Brand | Norsound by Norseal |
| Product Reference | NOR789 |
| Product Type | Flexible acoustic door-sealing profile |
| Product Category | Acoustic perimeter seals |
| Primary Intended Function | Restricting airborne sound and airflow through specified gaps around a doorset |
| Profile Material | Flexible PVC |
| Sealing Element | Hytrel thermoplastic copolyester elastomer |
| Standard Length | 2100mm |
| Available Colour | Black |
| Number of Stocked Options | One |
| Exact Profile Dimensions | Not stated in the supplied price list and not confirmed by a current public NOR789 datasheet |
| Fixing Method | Not confirmed by currently available NOR789-specific technical information |
| Kerf or Groove Dimensions | Not confirmed — establish from the physical profile and current manufacturer guidance before machining |
| Required Compression or Deflection | Not confirmed — determine from the supplied profile and approved fitting arrangement |
| Standard Installation Position | Must be confirmed from the doorset specification and current product guidance |
| Acoustic Test Standard | No NOR789-specific test report has been identified within the currently available product information |
| Smoke Test Standard | No NOR789-specific smoke-test evidence has been identified |
| Fire Test Standard | No NOR789-specific fire-resistance evidence has been identified |
| Intumescent Material | Not stated; the product must not be treated as an intumescent fire seal |
| Cycle-Test Rating | No NOR789-specific cycle-test rating has been confirmed |
| Current Public Manufacturer Page | No dedicated current NOR789 page was located |
| Standalone Acoustic Rating? | No — performance depends on the complete tested doorset arrangement |
| Standalone Smoke Classification? | No classification should be assigned without current NOR789-specific evidence |
| Standalone Fire Rating? | No — the product does not independently provide a fire-resistance period |
| Colour | Length | Material Description | Product Code |
|---|---|---|---|
| Black | 2100mm | Flexible PVC with Hytrel seal | NOR789/2100/BLK |
The stocked code can be interpreted as:
The complete stocked product code is:
NOR789/2100/BLK
Hytrel is a thermoplastic copolyester elastomer.
General material characteristics associated with Hytrel include:
These are general characteristics of the Hytrel material family.
The precise performance of the NOR789 depends on the selected Hytrel grade, profile geometry and complete seal construction.
Before specifying the NOR789, obtain or confirm:
Do not base machining or certification decisions solely on the product name or order code.
The NOR789 is supplied as an acoustic sealing profile, but no universal decibel value should be applied to the strip itself.
Final acoustic performance depends on:
Only a rating supported by evidence for the complete tested door assembly should be quoted.
Do not claim a smoke-control classification for the NOR789 without a current supporting report or certificate.
Where smoke control is required, confirm:
The NOR789 must not replace a required intumescent seal unless current doorset evidence specifically permits that arrangement.
Before using it on a fire-resisting door:
The number of 2100mm lengths required depends on the intended sealing arrangement.
A three-sided single-door perimeter may require separate sections for:
One 2100mm length may cover one standard-height jamb, but additional material will normally be required for the opposite jamb and head.
Measure all required sections before ordering.
Store the NOR789:
Do not place heavy materials on top of the flexible sealing element.
Inspect the installed profile regularly.
Replace the specified seal where it is:
Use the same confirmed profile when replacing damaged sections.
Norsound NOR789 Acoustic Flex PVC Hytrel Seal must be installed using the fixing arrangement, orientation and door gap intended for the supplied profile.
Before machining or applying the seal, inspect the physical cross-section and obtain the latest available manufacturer or supplier fitting information.
Do not copy the groove dimensions or installation method used for another Norsound perimeter seal.
The tools required depend on the confirmed fixing method.
Typical equipment may include:
Confirm:
Do not begin production machining until a short sample has been trial fitted successfully.
Inspect the door leaf, frame, stops, hinges and threshold.
Confirm that:
Correct substantial doorset defects before fitting the acoustic profile.
Inspect the physical NOR789 cross-section and identify:
Do not assume that the Hytrel element should face a particular direction without checking the manufactured profile.
Determine whether the supplied profile is intended to be:
Use only the fixing method stated for the NOR789.
Do not add unapproved screws, staples, adhesives or sealants that may prevent the profile from flexing correctly.
Identify the position required by the doorset specification.
This may be around:
The flexible sealing element must face the opposing surface it is intended to contact.
Before cutting or machining the complete doorset, trial fit a short sample.
Close the door slowly and check that the Hytrel element:
Adjust the proposed position only in accordance with the manufacturer’s guidance.
Where the NOR789 is confirmed as a kerf-fit or push-fit profile, establish the groove dimensions from:
The groove should:
Test the tool setting on a suitable offcut before machining the doorset.
Before machining a fire-resisting door or frame:
Do not proceed where the required evidence is unavailable.
Measure each required section separately.
Typical sections may include:
Do not assume that both jambs are exactly the same length.
Record each measurement clearly.
Transfer the measurements onto the NOR789.
Do not stretch the flexible PVC or Hytrel element while measuring.
Mark each piece according to its intended position, such as:
Retain the correct orientation when marking every section.
Cut the NOR789 cleanly using a tool suitable for the profile construction.
Support the profile during cutting to prevent:
Remove loose cutting debris and inspect the end before installation.
The installation area must be:
Where a groove is used, remove all machining debris before inserting the profile.
Where adhesive fixing is confirmed, allow the cleaned surface to dry completely before exposing the adhesive.
Position the first cut section without completing the permanent fixing.
Check that:
Correct the section before permanent installation where necessary.
Install the first vertical section using the confirmed fixing method.
Work progressively along the length while maintaining alignment.
Do not:
Repeat the process on the second jamb.
Maintain:
Measure the final distance between the installed jamb pieces.
Cut and dry fit the head section.
Install it using the confirmed fixing arrangement.
The head and jamb pieces should meet closely without:
Inspect every joint.
The profile should provide continuous sealing contact through the head-to-jamb junctions.
Where the manufacturer specifies mitred joints, cut the ends to the required angle.
Where butt joints are specified, make them closely fitted and square.
Do not choose a joint method without checking the profile guidance.
Close the door while observing the Hytrel element.
Check that it:
Stop and correct any section that folds, twists or pulls out of position.
Open and close the door several times.
Confirm that:
Do not leave the doorset in service where the seal prevents correct closing or latching.
The perimeter seal does not automatically treat the gap beneath the door.
Where acoustic control is required, confirm that the doorset includes a suitable:
Ensure the lower ends of the perimeter seals meet the threshold-sealing zone without leaving significant corner gaps.
Inspect the entire installation for:
Record the product reference and installation arrangement where the doorset is subject to an inspection or maintenance programme.
Inspect the NOR789 regularly.
Check for:
Clean the profile using a soft cloth and a mild cleaning product compatible with PVC and thermoplastic elastomers.
Avoid:
Replace damaged sections using the same confirmed NOR789 profile.
Correct profile identification, orientation, fixing and sealing contact are essential.
The NOR789 does not independently create an acoustically rated, smoke-control or fire-resisting doorset.
Final performance depends on:
For certified or performance-rated doorsets, use the NOR789 only where supported by current product and doorset evidence.
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