KASTAR 988 High Tack MS Polymer Sealant

Extremely high initial adhesive strength.

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KASTAR 988 is a special formula in super tough, stainless, elastic and versatile construction and installation adhesive, with extremely high initial adhesion and high hardness for heavy-duty, instant and permanent adhesion, that is based on hybrid technology and moisture-cures sealant.


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Product Specification

Chemical BaseSilane Modified Polymer
Curing MechanismMoisture Curing
ColorWhite/Black/Grey or customized
Density 1.58±0.1 gr/ml
Tack Free Time 10-15 min (23°C and %50 R.H.)
Cured depth (24hours) >3mm (23°Cand %50 R.H.)
Tensile Strength ≥2.9MPa
Elongation at break ≥250%
Shear stress 2.7MPa
100% Tensile Modulus ≥1.65MPa
Shore A Hardness 65A
Solvent content0 (%)
Isocyanate content 0 (%)
Application Temperature +5°C to +35°C
Temperature resistance -50°C to +120°C
UV – and weather resistance Excellent
Colours (standard) White Grey, Black

*Curing condition of the sample :23℃×50%RH× 14 days

Product Features

  • Extremely high initial adhesive strength.
  • Versatile both indoors and out, super strong, fast and user-friendly.
  • Excellent adhesion without primer on practically all surfaces, even moist ones.
  • Rapidly strengthens, cures and reaches ultimate strength.
  • High ultimate strength and mechanical resistance, for heavy-duty adhesive connections.
  • Superb paintability.
  • Thixotropic, no sagging, ideal for overhead applications.
  • Non-corrosive to metals.
  • Compatible in direct contact with the silver coating on mirrors and PVB-laminated glass.
  • Odourless, adhesive-free, bubble-free and non-shrink curing hybrid system.
  • Good resistance to UV, weather, water, moisture and ageing.
  • Free of isocyanate, solvents and silicone.
  • No staining or bleeding, no edge contamination.


  • Adhere and install mirrors, natural and hard stone, marble, granite, concrete and other critical/porous materials.
  • Installation and construction adhesive for sections, panels, skirting board, mouldings, insulation and panelling materials, slats, beams, stones, tiles and more.
  • Adhere and install metal parts in the construction of roofs, façades, containers, air ducts, trailers, bodywork and ships

Consumption (approx.)

Joint width12mm20mm24mm
Joint Depth6mm10mm12mm
Joint length / 600 ml8 meters3 meters2 meters

Surface Preparation

Brush and remove dust before applying on concrete and other alkaline surfaces.


Meets or exceeds the requirements of the following specifications:
CE marked for EN 15651 for façade applications.


  • Avoid application below +5 °C and above +35 °C.
  • Do not apply on curing silicones.
  • Minimum depth for working joint is 6 mm.
  • Maximum expansion and contraction should not exceed 25% of average joint width.

Storage and shelf life

12-18 months if stored in its original package, away from direct sunlight and moisture, between+10⁰C and +25 ⁰C


Those who are in contact with the product, including the use, storage and transportation, must read the “chemical safety technical instructions” and product labels of the product carefully in advance, and use the product according to the regulations. More product information can be obtained from the seller.

Packing Specification

Product TypeVolumePackage
White,Grey,Black280ml, 300ml24