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  Expension Sealant:

Construction & Repair Swelling Hydrophilic Mastic



TamSeal SM is a one component hydro reactive expansion sealant for waterproofing joints in concrete. It is applied using a skeleton gun. TamSeal SM expands up to 100% when in contact with fresh water to create a durable waterstop with long- lasting adhesive and hydro-swelling properties. When in contact with sea water, TamSeal SM expands between 50 - 70%.

TamSeal SM has excellent adhesive properties on different surfaces such as concrete, steel, glass, PVC, HDPE etc. The surface can be rough, smooth, damp or dry.

Key Benefits


Single component, direct application.

A problem solving hydrophilic in difficult access areas

Fast curing, enable early concrete pour and rapid return to service.

Excellent seal on rough concrete and plugging up irregular surfaces

Durable - excellent wet/dry cycle, retaining elastic character and swelling performance


Typical Applications


Construction joints

Pipe penetrations (concrete, PVC etc).

Waterproofing of joints between precast concrete elements (e.g. inspection manholes, box culverts, sewer systems etc).

Waterproofing of H-beam penetration through floor slabs

Adhesion of TamSeal R, BR and BBR on an irregular surface.

Sealing around conventional PVC waterstop providing a belt seal prior to concrete pour


Technical Data 





Elastic paste

Specific gravity


Solids (min.)


Application limits

20 C - 70 C

Tack-free time

1 hour

Approx. dry time

10 hours

Shore A Hardness


Tear resistance


Set time (3 mm thickness)

24 hours

Expansion volume (%) Water

Sea water


50 - 70

Concrete pour

Allow 4 to 8 hours

All technical data stated herein is based on tests carried out under laboratory conditions.

Application Guidelines


TamSeal SM should not be used for expansion joints or for joints subjected to significant repetitive movement.

TamSeal SM should be positioned to ensure that there is a minimum of 70mm concrete cover to accommodate the swelling caused by pressure.

TamSeal SM will establish a firm bond to concrete. However, as with any hydrophilic waterstop, care should be taken during concreting directly onto the seal.



TamSeal SM should be stored at room temperature (min 10 C and max 35 C), kept dry and off the ground. If these conditions are maintained and the product packaging is unopened, then a shelf life of 1 year can be expected.

Health & Safety


TamSeal SM should only be used as directed. We always recommend that the Health & Safety data sheet is carefully read prior to application of the material. Our recommendations for protective equipment should be strictly adhered to for your personal protection 


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