KASTAR 119 Low modulus PU sealant for construction joints

Low modulus, Flexibility, Construction joints, Excellent Anti-movement

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KASTAR119 Polyurethane Construction Sealant is a one-component gun-grade polyurethane-based construction sealant, it is of low modulus and cures by reaction with atmospheric moisture to form a soft rubber-like material with excellent elastic and adhesion strength.


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Technology datasheet

Testing Items Performance
AppearanceBlack/white/Gray homogeneous paste
Density (g/cm³)1.35±0.05
Sagging properties (mm)≤1
Elongation at break (%)≥600
Volatile contents (%)≤4
Stretch modulus (Mpa)≤0.04
Touch Dry time  (min≤180
Elastic recovery (%)≥80
Extrudability (ml/min)80
Pollution propertiesNon
Application temperature  (ºC)+5~+35
Shelf life (month) 9


  • Mildew proofing, Meeting national standards for sealing drinking water pipes.
  • One component, no need of mixing.
  • Easy for applying.
  • Highly elasticity and low modulus.
  • Excellent durability, and weathering resistance.
  • Self-bonding, easy for repairing.
  • Three kinds of colors are available.
  • 600, 400 cc aluminum foil packaging, 310 cartridge package for choice.
  • Can be painted.


  1. KASTAR119 is suitable for most building joints, including perimeter caulking of doors and windows.
  2. Expansion joints.
  3. Joints in pre-cast panel.
  4. External walling, curtain wall joints.
  5. Skylights, smoke vents.
  6. Other structural sealing for areas with structure movement.

Clean up

Clean and dry all surfaces by removing foreign matter and contaminants such as oil dust, grease, frost, water, dirt, old sealants and any protective coating. Dust and loose particles should be cleaned.


310ml cartridge, 20 pcs/carton
600ml/400ml sausage, 20 pcs/carton


Minimum application temperature: 5℃.

It should be dispensed from either the cartridge or sausage by means of a caulking gun. Pierce the membrane at the top of the cartridge and screw on the nozzle. Cut the nozzle to give the required angle and bead size. Place the cartridge in an applicator gun and squeeze the trigger. For sausages, a barrel gun is required, clip the end of the sausage and place it in the barrel gun. Screw end cap and nozzle on to barrel gun. Using the trigger extrude the sealant, to stop depress using the catch plate.


  • For common occasions, after cleaning out the surface with the organic solvent, this product can be used directly.
  • Please construct by application instructions strictly, failure of stickiness may be caused by any operation disobeying construction techniques.
  • This product is innocuous after curing completely, but before set, please avoid contacting with eyes and skin. In case of eye and skin contact, wash immediately and thoroughly with soap and water. See a doctor immediately if it is serious.


Activators and/or primers is not required.