Hyperseal Expert 150®


One component, polyurethane-based, low modulus joint sealant
ideal for use in high humidity conditions


HYPERSEAL®-expert is a novel low modulus expansion joint sealant, especially formulated to ensure bubble free cure even at very high temperature and humidity climatic conditions. The product displays excellent thixotropy allowing its use even in very large expansion joints. It cures by reaction with atmospheric humidity to produce a joint sealant with a 50% joint movement accommodation factor and excellent adhesion on substrates traditionally problematic for PU sealants, e.g. glass, aluminum, steel, polycarbonate, etc.. The extrusion rate and tooling of the sealant remain the same throughout a very wide range of temperature and humidity conditions.


Complies to:

  • ISO – 11600

  • Typ F – Klasse: 25LM

  • DIN 18540-F

  • ASTM C 920

  • US Federal Specification TT-S-00230C

  • Type II Class A


Recommended for:
Sealing joints in:

  • Insitu concrete,

  • expansion concrete plates,

  • glass,

  • precast panels,

  • brick and block work,

  • water tanks and swimming pools,

  • metal frames,

  • aluminum windows and panels,

  • irrigation channels, 

  • granite & marble


Shelf Life:

Can be kept for 12 months minimum in the original unopened pails in dry places and at temperatures of 5-25°C. Once opened, use as soon as possible.



300cc Cartridge

600cc Sausages




Features & Benefits

  • No bubbling/swelling upon curing in difficult
    climatic conditions.

  • Excellent Thixotropy

  • Excellent adhesion on almost any type of surface, with or without the use of special

  • Excellent extrusion, tooling and storage stability
    over wide range of climatic conditions.

  • Excellent chemical resistance, suitable for
    sealing joints in swimming pools and chemically
    treated water.

  • Low modulus, joint movement accommodation
    50% Microorganism and fungus resistant.

  • Excellent heat resistance, suitable for application where exposure to temperatures >60°C take place.

  • Resistance to cold: The sealant remains elastic even down to -40°C.



Apply backing material such as open cell
polyurethane or a closed cell polyethylene backing rod. Although both types of backing rod are recommended care must be taken when using the closed cell polyethylene rod that the outer skin not be punctured as in rising temperature conditions it may cause bubbling. Backing rod application is important as it ensures that the correct width to depth ratio is achieved provides a
firm backing against which the sealant can be tooled off.

Slide the sealant into the applicator gun, cut off the very end of the sealant packaging and fit the gun with the nozzle that has been cut to deliver the right bead size. Extrude the sealant into the joint ensuring that no air is trapped in the joint. Tooling is recommended immediately after the
application of sealant. The ratio width to depth should be 2:1 subject to a minimum depth of 10mm.


For further details please refer to the


Technical Data Sheet:

Adobe PDF file icon 32x32


Hyperseal 2