KASTAR 789 Super Neutral Weather-proofing Silicone Sealant

Neutral cure, weatherproof, waterproof, Excellent UV-resistance

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KASTAR 789 is one component and medium modulus weather-proof silicone sealant. It specially designed for sealing of exterior and interior materials.


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  • KASTAR789 belongs to RTV-1, with good extrusion, and thixotropy between 40C~400C. Easy to use.
  • Neutral curing, non-corrosive to metal, coated glass, concrete, marble, and most kinds of plastic, etc.
  • Quickly speed of curing, excellent adhesion, middle modulus, excellent movement capability.
  • Excellent resistance to weather.
  • Excellent resistance to low and high-temperature change. Little changes in performance at -400C ~1500C.
  • Excellent adhesive to most common building materials, Special materials will have a better adhesive with priming.
  • Good compatibility with other neutral silicone sealants.
  • Belong to non-dissolvent products, low vulcanization shrinkage, and green environmental protection products.
  • NUSEAL789 also is A high-performance sanitary silicone sealant containing anti-fungal compounds to prevent mold growth in areas subject to high humidity levels.


* For weather sealing in glass curtain wall joints;
* For weather sealing in aluminum, enamel curtain wall joints;
* For sealing in marble (granite), concrete, tile, metal panel materials etc.;
* Many other building & Industrial uses.

Restriction of Usage

1. Can’t be used as a structural sealant.
2. Unsuitable for all kinds of material that can effuse grease, plasticizer, or solvent.
3. Unsuitable for the airproof location, because it is required to absorb moisture in the air to cure for the sealant.
4. Unsuitable for frosty or moist surfaces.
5. Unsuitable for a continually soggy or moist place.
6. Can’t be used if the temperature is below 4°C or above 40°C on the surface of the materials.


* Non-toxicity when cured.
* Avoid eye contact before curing. If this happened, rinse opened eye for several minutes under running water, then consult with a doctor.
* Keep away from children.
* Ensure adequate ventilation at the workplace or curing area.


Keep in dry place; don’t unseal it before use; keep a storage temperature below 25℃ to prolong its service life; 12 moths guarantee.

Application Standard

China GB16776-2005 Silicone Structural Sealant

Capacity movement±30%
Skin formation10-20 minutes
Drying time(2mm/h)10-14
Max. Tensile strength1.8
Hardness shore22±2
Elongation at Break(%)≥450
Modulus Mpa(100%)0.60
Application temperature-20℃ to +40℃
Temperature resistance-50℃ to +100℃
Cold-hot adhesiveOK
Under water adhesiveOK
Elastic Recovery Ratio (%)98
Mass-loss Rate (%)9.6

Skin drying time and fully drying time under: 23℃and 50% humidity

Optional Color

Black, white, grey or appointed color of clients

Packing Specification

280ml, 300ml, 310ml (net capacity) hard package or 590ml (net capacity) complex aluminum foil soft package (the actual weight is subject to final products)