IZOMAX®STB-SW

IZOMAX® STB-SW is a swelling waterstop based on modified hydrophilic thermoplastic. On contact with water it swells in a controlled manner, filling the joint cavity and preventing water ingress.

Fields of Application
•    Construction (cold) joints in reinforced concrete structures. Not to be used in movement (expansion) joints.
•    Foundation-to-retaining wall connections
•    Pipe and service penetrations
•    Water tanks, reservoirs and swimming pools
•    Basements, underground car parks and lift pits
•    Retaining walls and bored pile caps
•    Water treatment plants, channels and hydraulic structures
•    Precast element connections

Advantages
•    High swelling capacity; ≥ 600% by weight after 7 days in demineralised water
•    Retains swelling performance in alkaline and acidic environments
•    Dimensionally stable; the swelling–recovery cycle is repeatable
•    Applied without welding, heating or special equipment
•    Can be bonded to concrete, steel and PVC pipe penetrations
 

General Information

Material composition

Modified hydrophilic thermoplastic

Appearance

Blue tape with rectangular cross-section

Density

~ 1.28 g/cm³

Performance Data

Swelling capacity (by weight) – demineralised water, 7 days

≥ 600%

Swelling capacity (by weight) – alkaline conditions, 8 days

≥ 350%

Swelling capacity (by weight) – acidic conditions, 11 days

≥ 300%

Resistance to hydrostatic pressure

5 bar (tested up to)

Hardness

35 Shore A

Tensile strength at break

1.5 N/mm²

Elongation at break

500%

Chemical resistance

Resistant to many chemicals

Application Data

Minimum concrete cover

100 mm

Overlap at joints

Min. 80 mm

Fixing

Adhesive sealant or swellable sealant

Suitable substrates

Concrete, steel, PVC pipe

Safety Information

Toxicity

None

Hazardous substances

See SDS


The stated technical values were obtained at +23°C ambient temperature and 50% relative humidity. Swelling values vary with water quality; in saline and mineral-rich water the swelling rate decreases.