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Donseal® PU440
One component, non sag, elastomeric polyurethane sealant with high tear and weather resistance (Formerly known as Flexseal PU440)
  • Very easy and economical to use.
  • One component.
  • Excellent aging resistance.
  • Paintable.
  • Excellent acoustic properties.
  • Remains elastic at temperatures down to -40oF (-40oC).
  • Good resistance to microorganisms and a variety of chemicals.
  • Good adhesion to most surfaces without the need for priming.

Donseal PU440 is a one-component non-sag polyurethane sealant that cures by reacting with air humidity to form a tough and highly elastic low modulus sealant. Donseal PU440 has a very wide service temperature range. Suitable for vertical and horizontal joints.

  • General sealing of construction and expansion joints.
  • Basement walls.
  • Precast concrete elements.
  • For concrete, wood, marble, aluminium, steel, ceramic, gypsum boards, etc.

Donseal PU440 is available in 20.2 fl . oz. (600 ml) sausages, and in 10.1 fl . oz. (300 ml) moisture proof cartridges.


Donseal PU440 complies with:

  • ASTM C920, Type S, Grade NS, Class 25, Use NT, T1, A, M and I.
  • Federal specification TT-S-00230C, Type II, Class A. 
  • EN 15651-1:2012, F-EXT-INT-CC.


  • LEED® EQc 4.1 SCAQMD.
  • Rule 1168.
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Donseal® PU440
Donseal® PU440
Donseal® PU440