KASTAR 965 Construction Joints MS Polymer Sealant

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Features & Benefits

KASTAR965 is an extremely elastic moisture curing sealant designed for use in cementitious siding, metal architecture, curtain wall construction, and joints subject to movement. KASTAR965 adhesion to difficult surfaces permits its use on anodized metal and coatings. KASTAR965 will not stain absorbent stone substrates like limestone or marble. Kastar965’s unique polyether chemistry eliminates out-gassing on green concrete and protects against “sun tanning” or discoloration when exposed to ultraviolet light discolor.

Application Areas

It has a good adhesive strength without primer on most common materials including: wood, EPS Foam, Metal such as: aluminum, zinc, galvanized steel,stainless steel, copper, natural stone, concrete, brick, PVC plastic, ABS etc.

Chemical Base

Typical Physical Properties

Chemical BaseModified Silane Polymer
Curing SystemMoisture
Density1.41 gr/ml
Tack free time22 mins (23°C and %50 R.H.)
Curing rate>3.0mm/ 24 hr (23°C and %50 R.H.)
Hardness Shore A25
Elongation at break≧400%
Tensile strength0.51Mpa
100% Tensile Modulus0.25Mpa
UV resistantNo change.
Service Temperature-50°C to +70°C
Application Temperature+5°C to +35°C
Shelf life12 months


  • Before the application, the tip of the cartridges is cut and a plastic cap is fixed.
  • The tip of the cap is cut according to the width of the surface and fixed to the cartridge gun.
  • For bonding application: Apply the adhesive in strips or dots to the base or on the element to be bonded. The strips must be applied in vertical rows. Bring together the parts to be joined as quickly as possible, at least within 5 minutes (this depends on the temperature and relative humidity level).
  • For sealing application: The surface of KASTAR clear applied in the joints should be smoothened with a dampene.


  • Solvent free, 100% solids will not shrink
  • Non-slump, applies vertically and overhead
  • No outgassing on damp surfaces
  • Available is a wide range of roofing & siding colors
  • Color stability, will not suntan
  • Paintable within 24 hours (See limitations)
  • +/- 25% joint movement
  • Application Dimentions

Application Dimentions

  • Minimum width for bonding is 1 mm.
  • Maximum width for bonding is 3 mm.
  • Minimum width for joints is 5 mm.
  • Maximum width for joints 10 mm.
  • Minimum depth for joints 5 mm.
  • Consumption (approx.)

Surface Preparation

Following cleaning procedure and materials are recommended:

  • Glass Degrease with alcohol or MEK
  • Aluminium, light alloys and stainless steel Degrease with alcohol or MEK
  • Other Metals Lightly abrade then degrease as above
  • Wood Lightly abrade surface then remove dust
  • Plastics Degrease using an agent recommended by plastics manufacturer
  • Concrete and other alkaline Surfaces Brush and remove dust


Meets or exceeds the requirements of the following specifications:

  • The requirements of VOC content specifications in LEED credit EQc4.1
  • “Low-emitting products” of SCAQMD rule 1168.
  • The French VOC requirements for class A+
  • CE marked for EN 15651 for façade & glazing applications (DOP NO: 2016-0004).


It must not be used in totally confined spaces where sealant cannot cure due to lack of atmospheric moisture.

Cannot be used on natural stone. Because the adhesion surface will discolor under influence of the sealant (looks wet) and also this is visible through the sealant due to its clear look.

Do not use in applications where continuous water immersion is possible.

Prolonged exposure to direct sunlight can cause discoloring, Joint Width 5mm 10mm Joint Depth 5mm 5mm

Efficiency /310 ml 12 meters 6 meters

Storage and shelf life

  • They should be protected from water, frost and adverse air conditions.
  • They should be kept dry and cool on wooden pallets at between +10 °C and +25 °C in moisture free conditions.
  • The opened products should be consumed immediately.
  • Shelf life is maximum 9 months conditional to complying with the aforementioned storage conditions.

Safety & Disposal

For information and advice on the safe handling, storage and disposal of chemical products, users shall refer to the most recent Material Safety Data Sheet containing physical, ecological, toxicological and other safety-related data.

The technical data contained herein is based on our present knowledge and experience and we cannot be held liable for any errors, inaccuracies, omissions or editorial failings that result from technological changes or research between the date of issue of this document and the date the product is acquired.

Before using the product, the user should carry out any necessary tests in order to ensure that the product is suitable for the intended application.

Moreover, all users should contact the seller or the manufacturer of the product for additional technical information concerning its use if they think that the information in their possession needs to be clarified in any way, whether for normal use or a specific application of our product.

Our guarantee applies within the context of the statutory regulations and provisions in force, current professional standards and in accordance with the stipulations set out in our general sales conditions. The information detailed in the present technical data sheet is given by way of indication and is not exhaustive. The same applies to any information provided verbally by telephone to any prospective or existing customer.

Chemical Base

Product TypeVolumePackage
White, Black, Grey300ml24
White, Black, Grey600ml20