Polyurethane Sealants Uses and Characteristics

What Is A Polyurethane Sealant? Where And How To Use?

Sealants are applied in the residential, commercial, and industrial sectors. It makes a vast difference to its overall strength and longevity. Polyurethane sealant has earned a standard material designation across an extensive range of applications. Over the years, PU has evolved into resilient and binding sealants in the construction sector. 

Uses of polyurethane sealant

PU sealant is widely used in new as well as renovation building projects. Quicseal is a well-establish brand manufactured in Singapore. You can see Quicseal products in solo and multiple formulations. PU sealants are generally applied in non-sagging vertical applications or horizontal joints. It includes –

  • Isolation joints
  • Gutters
  • Roofing
  • Foundation
  • Expansion & control joints

Several additives or raw materials are added to the PU polymer for creating a finished sealant different in performance, functionality, and quality. 

Characteristics of PU sealants

  • Moisture-resistant
  • Corrosion-resistant
  • Scuff-resistant
  • Chemical-resistant
  • Crack-resistant
  • Abrasion-resistant
  • Easy application and cleanup
  • Heavy-duty durable adhesive
  • Flexible [adjusts well to contraction and expansion due to temperature fluctuations]
  • Low VOC content
  • Available in latex or water-based compounds

Limitations of PU sealants

There are some limitations you need to consider before choosing it for your project.

  • PU is suggested for dry substrates.
  • White construction PUs is prone to potential discoloration when exposed to severe sunlight.
  • There is a possibility of mold and dirt attraction.
  • Can have limited joint movement capabilities.

Variations in formulations can lead to performance differences. If you fail to understand the specific PU sealant’s formulation then there can be unanticipated performance concerns. The different configuration of sealants has different uses and application. Therefore, carefully read the labels.

  • Polyurethane construction sealants
  • Standard PU sealants
  • UV-resistant PU sealants
  • Non-staining PU sealants

The methods used for applications are pressing, brushing, spraying, and layering. You will generally find these sealants in 10-ounce tubes but for extra precision, while sealing tight joints and corners use a caulking gun.