Waterproofing band in Hypalon, 25 cm, for expansion joints

Code: PRS.0037

Components: 1

Appearance: Tape

Strap with high resilience and resistance, with an overall width of 25 cm, consisting of a special elastomeric layer in Hypalon, resistant to raging and wear and tear, for use in combination with the epoxy resins paste SYNTECH AS 21 or SYNTECH AS 31, for waterproofing watertight expansion joints in buildings, works and structures below the aquifer level or to ensure the water sealing of structural connections even off the ground. Specific applications for industrial or infrastructural use.

Linee di appartenenza

Certification obtained and Standards

Flexible membranes for waterproofing

EN 13967:2012

Flexible membranes for waterproofing

General characteristics


Shelf-life: 12 months


Temperature of use: -30 / +90 °C


Width: 250 mm

Technical specifications

Breaking load lateral

221.8 N / 15 mm _

Breaking load longitudinal

241.4 N / 15 mm _

Extension break lateral

900 %

Extension break longitudinal

900 %

Fire resistance

B2 _


87 _

Power absorption at 25% elasticity lateral

42.7 N/mm

Power absorption at 50% elasticity lateral

49.2 N/mm

Resistance to tearing

100 N

Resistance to water pressure

>4.0 bar

Tensile adhesion with gluing using SYNTECH AS 21

> 7 N/mm²


1.0 mm

Unit weight

988 g/m²

UV resistance

6500 h

Available colours

- Gray

Packaging and dimensions

- Roll 20 m


The excellent adhesion with epoxy adhesives such as SYNTECH AS 21 (AS 31) is greatly improved thanks to the perforated edges that allow a collaboration between the lower layer and the upper layer of resin. SYNTECH AS epoxy fillers allow the gluing of the ELASTOTEX 250 COMBI strip on various types of substrates (see paragraph "Preparation of substrates") including pvc supports (see technical document "Adhesion test on pvc sheath").
The strip is flexible and deformable (even at low temperatures) and extremely resistant to traction, root aggression, atmospheric agents and many chemicals. It is easy to lay and this allows for quick, safe and non-hazardous applications for the applicator.


1 metre of ELASTOTEX 250 COMBI for each linear metre, being careful to overlap the rolls of approximately 5-10 cm in correspondence with the edges of the band to guarantee the permanent water tightness of the system. Consumption of epoxy resin for bonding about 1.5 kg / m.

Use fields

Waterproofing expansion joints, including large ones, subject to considerable work movements, and of natural joints and fissures, also in conditions of hydraulic counter-thrust, in tunnels, silos, tanks, pools, basements, roofing, prefabricated coverings, road joints and hydraulic works in general.

Preparation of supports

The concrete surfaces must certainly be free of incoherent parts, traces of grease, release agent, paints by sandblasting, shot peening, grinding or milling, followed by careful removal of dust. The cement conglomerates must have a minimum tensile strength of 1.5 N / mm2. The curing of the concrete must be at least 3 - 6 weeks depending on the climate. The metal surfaces must be perfectly clean and free from rust, calamine or lamination residues, by sandblasting or equivalent mechanical treatment followed by careful removal of dust (on metal surfaces pay maximum attention to the dew point). The polymeric surfaces must be roughened by sanding. Work areas, edges, etc. they must be delimited with adhesive tape.

Use method

Mix the epoxy resin SYNTECH 21 (AS 31) thoroughly in the pre-determined amount as required (on average roughly 1 kg per meter). Spread the epoxy adhesive prepared as described above, on the sides of the joint to be waterproofed by toothed adhesive spreader, kept constantly clean, taking care to obtain uniformity of the thickness applied that must not be less than 2 mm. Unroll and apply the ELASTOTEX 250 COMBI strap, on the fresh adhesive spread, pressing it against the resin, stretching the ends by hand, taking care to avoid wrinkling and air bubbles, until the underlying resin leaks out from the holes on the strap. Apply with a metal filling knife a second layer (at least 2 mm) of SYNTECH AS 21 (AS 31) adhesive at the edges of the strap, already impregnated, in order to protect it permanently from accidental damage and to obtain certain monolithicity of the end to the support.

For the joint between two adjacent straps, weld the end flaps for overlap and solder them using a special hot air welding machine. For additional security of the seal, a small layer of SYNTECH AS 21 (AS 31) should be applied on the heated flaps.

The final system resistances will be reached after about 7 days after laying, but already after 24 hours at 20°C, values equal to 60-70% of the final performances can be obtained. In any case the performance after 24 hours will be much greater than those of a high quality concrete.

Application methods

- Apply by hand

- Spatula

- Notched finishing trowel

Permitted supports

- Concrete

- Prefabricated concrete

- Metal surfaces

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