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wedi Joint sealant

wedi Joint sealant

"Glue and apply 100% seal at the same time.“

Product information

wedi Joint Sealant is a single component Silyl Modified Polymer (SMP) for use in wedi product system installations as specified in installation manuals. The product is especially formulated for high green strength (high internal strength), adhesion in wet and alkaline environments, and permanent flexibility. The product forms watertight seals on and in joints and in seams, and allows for dissipation of stress caused by shock, vibration or thermal movement.

Particularly in comparison to traditional sealing tape and reinforcing mesh solutions applied in thinset mortar, the wedi Joint Sealant performs better in terms of water protection and stress and movement protections. Thinset mortar bonded tape applications will naturally allow water to migrate below the tape while wedi Joint Sealant seals to surfaces without the thinset mortar as an absorbing layer in between. Where assemblies are exposed to normal movement, traditional thinset bonded tape or mesh can only protect or add reinforcing strength up to the performance of the thinset mortar embedding it. If the thinset mortar fails, and they are not designed a crack isolation products, the tape will naturally fail with it.

wedi Joint Sealant with its direct and tenacious adhesion, yet an elongation potential of 220% provides added protections against movement. The same formulation of product was originally formulated , and is today used to seal assemblies in US military vehicles utilized in difficult terrain and exposed to sudden shock and vibration. On this basis, wedi added specific performance attributes to benefit the wedi installation performance.

However, if movement or settling exceeds what a typical tile as the surface finish can tolerate as per ANSI 118.12, which is exposure up to 1/16”, no sealant or tape or even shower liner can protect. It is therefore imperative to follow structural building codes (IRC and IBC) to install tile and underlayment product only over structurally sound and service condition acclimated ( wood) and cured ( concrete) substrates. Excessive movement may be tolerated initially as long as the substrate regains its original setting ( no excessive permanent settling can be protected against). The wedi Joint Sealant is of high viscosity and exhibits excellent non-sag properties.

Basic material Silyl Modified Polymer (SMP)
Colour light grey
Curing Method Moisture
Green Strength 1400 Pa (Physica Rheometer MC100)
Specific Gravity 1.5 g/ml
Skin forming time (70°F/50% R.H.) approx. 20 min.
Through hardening (70°F / 50% R.H.) approx. 3 mm/24 hours
Volume change < 3% (DIN 52451)
Tensile strength (100 %) 350 psi (DIN 53504/ISO 37)
Elongation at break 400% (DIN 53504/ISO 37)
Shore on hardness 50 (DIN 53505)
Shear Strength 350 psi (DIN 53283/ASTM D1002) (adh. thickness 2 mm, test speed 50 mm/min)
Temperature resistance approx. -40°F to 25°F (-40°C to 121°C)
Application Temperature 41°F to 95°F (5°C to 35°C)

Product sizes

Order no. Designation Quantity
US5000013 wedi Joint Sealing, MS polymer sealant 10 oz. 1 Cartridge
US5000010 wedi Joint Sealing, MS polymer sealant 20 oz. 1 Sausage
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Areas of use wedi Joint sealant

  • Recommended application temperatures: 41°F – 95°F (5°C – 35°C)
  • For cold weather application, condition units to 70°F prior to use.
  • For best performance, sealants and adhesives should be applied to a joint at the midpoint of its designed expansion-contraction cycle.
  • Place nozzle/tip into joint and fill as required in installation manuals. Maintain consistent and continuous beads.
  • Compress internal joint applications between wedi products to be sealed. Tool topically applied sealant over seams using a putty knife.


  • Alcohol must not be used in preparation for bonding as it will stop the curing process.
  • Do not apply on surfaces below 40° F (4°C).
  • Not recommended for direct glazing of glass, acrylic or polycarbonate windows.
  • Relevant testing should always be performed by the user as wedi does not recommend wedi Joint Sealant as fit for any particular use besides the wedi product systems installations as specified in applicable wedi product literature.

Surface requirements:
For use as specified in wedi product system installations. General requirements: For reliable, repeatable and durable results, wedi joint sealant must be applied to clean, dry, sound and frost free surfaces, free of contaminants including, but not limited to paints, oils, oxide films, mold release agents, and dirt. wedi Joint sealant offers high green strength (internal strength) and permanently flexible adhesion in wedi construction joints and when exposed to alkaline environments.

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