Norsound NOR831 Retro Fit Hinged Glass Door Bottom Auto Drop Seal

Norsound NOR831 Retro Fit Hinged Glass Door Bottom Auto Drop Seal | Glass 8–12mm | Under-Glass Mount | 15.4 × 27mm

The NOR831 is a single-actuation automatic drop seal designed for retrofit installation to the underside of hinged acoustic glass doors with glass thickness in the range of 8–12mm. It shares the same housing profile, actuation mechanism, and fixing method as the NOR830, but accommodates a wider range of glass thicknesses — making it the appropriate specification where the glass thickness falls between 8mm and 12mm, or where a single seal variant is required across a mixed-thickness project. The housing is bonded to the underside face of the glass door leaf.

The NOR831 housing is manufactured from aluminium with a silicone gasket, supplied in silver anodised (C 0) or stainless steel-coloured anodised (C 31) finish. The housing profile is 15.4 × 27mm. Standard lengths are 708mm, 833mm, 958mm, 1083mm, and 1208mm, with a 125mm cutback. Single actuation. Bonded with adhesive (not supplied). For 8mm glass only, see the NOR830; for 10mm glass with edge mounting, see the NOR832; for 20mm glass, see the NOR833.

Applications

• Hinged acoustic glass doors — 8–12mm glass, under-glass mounting — bond to the underside face of the hinged glass door leaf to seal the gap between the door bottom and the floor when the door is in the closed position. The NOR831 accommodates glass thicknesses from 8mm to 12mm, making it suitable for installations where the glass thickness is not a standard 8mm or 10mm, or where a single seal specification is required across doors of varying glass thickness within a project.
• Retrofit installation on existing hinged glass doorsets — the bonded fixing method allows the NOR831 to be installed on existing glass door leaves without drilling or screwing into the glass.

Product Benefits

• 8–12mm glass thickness range — flexible specification across mixed-thickness projects. The NOR831 accommodates glass thicknesses from 8mm to 12mm, providing a single seal specification that covers a wider range of glass door configurations than the fixed-thickness NOR830 (8mm) or NOR832 (10mm) variants. This makes it appropriate for projects where multiple glass thicknesses are present, or where the exact glass thickness is not confirmed at the time of specification.
• Under-glass mounting — suited to hinged glass doors where edge mounting is not practical. Bonds to the underside face of the glass door leaf, making it appropriate for hinged glass door configurations where the bottom edge is not accessible or where the door hardware occupies the edge position.
• Single-actuation automatic drop mechanism — consistent sealing on every close. The actuator engages the door stop on closing, driving the seal carrier down automatically. The mechanism retracts on opening.
• Bonded fixing — no drilling into glass required.
• Five standard lengths — 708mm to 1208mm. The 125mm cutback accommodates the actuator mechanism at the end of the seal.
• Two finish options — silver anodised and stainless steel-coloured anodised.

Installation

Select the appropriate seal length for the door leaf width, accounting for the 125mm cutback at the actuator end. Clean the underside face of the glass door leaf thoroughly — the surface must be dry, grease-free, and free from contamination before bonding. Apply a suitable structural adhesive (not supplied) to the housing and press it firmly onto the underside face of the glass, ensuring correct alignment along the full length of the door leaf. Confirm the glass thickness is within the 8–12mm range before bonding. Allow the adhesive to cure fully before operating the door.

Once cured, close the door and check that the actuator engages the door stop cleanly and the seal carrier drops to make full contact with the floor. Check that the carrier retracts fully on opening.

The Technical Details