Home > Companies > Lorient Polyproducts Ltd > LAS8012 si Drop Seal

A heavy duty automatic drop seal designed for optimum acoustic performance.

Requires no power connection. Self-levelling on uneven floors; seal height can be adjusted independently of fixing screws. Supplied with standard nylon end caps. Die cast end plates in a metallic finish for premium aesthetics are an option.

Key benefits:

  • Protects against weather, draught and light.
  • Suitable for wheeled traffic.
  • Features a parallel drop mechanism.
  • Product is self-levelling on uneven surfaces.
  • Tested for acoustic performance with BS EN ISO 10140-1:2010+A2: 2014 (Annex J).
  • Meets the performance requirements of BS 9999, and is used for sealing the threshold of door assemblies against the leakage of ambient temperature smoke.
  • During a durability test, the seal completed 1000 000 cycles without failure.

Fixing screws and pre-drilled end flanges are supplied with this product.

Standard product features


  • Gasket: Silicone rubber.
  • End caps: Nylon.


  • Die cast end plates are available in a metallic finish.
  • The non-button end is designed blank, creating an engineered smooth aesthetic.


Single swing doors. For use on both right- and left-handed doors.

Use with:

  • Any perimeter seal.
  • Any threshold plate.


42 mm high (excluding seal in dropped position) x 40 mm wide.

Minimum/ maximum gap size:

1 mm/ 15 mm.

Acoustic performance:

Weighted Sound Reduction Index (Rw): Up to 43 dB.



All lengths can be cut to the next size down.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-75-40/430 Door and window weatherstrips and seals

Product specification

An important note about specifying



Lorient Polyproducts Ltd


+44 (0)1626 834252

Product reference

LAS8012 si Drop Seal


[335 mm]
Can be cut back to 275 mm.
[435 mm]
[535 mm]
[635 mm]
[735 mm]
[835 mm]
[935 mm]
[1035 mm]
[1135 mm]
[1235 mm]

Colour/ Finish

[Silver anodized aluminium with black end caps, and black silicone rubber gasket]
[Silver anodized aluminium with grey end caps, and grey silicone rubber gasket]

Type (End Plates)


Manufacturer details

Endeavour House,
Fairfax Road,
Heathfield Industrial Estate,
Newton Abbot,
Devon, TQ12 6UD
Tel +44 (0)1626 834252
Fax +44 (0)1626 833166
NBS Plus