Construction Joint Sealants

Excellent elasticity and cohesion

Polyurethane raw materials for high-performance joint sealants

Joint sealants are crucial to structural performance. They act as barriers to moisture, oxygen, and environmental contaminants by sealing the joints and gaps. Optimum protection is achieved through proper sealant selection for each application, yet too often sealants are given little thought.

Construction Joint Sealants
Structural performance with joint sealants using Covestro raw materials

Joints can be static or moving. For the latter, elastic sealants that can change their shape and size as the joints move are needed.

A sealant’s properties, such as modulus of elasticity, stress/strain recovery characteristics, tear strength and fatigue resistance must be considered. Other properties to consider are durability and resistance to moisture, UV radiation, heat, microbial degradation and cyclic joint movement.

Solvent-free 100 percent solids polyurethane and silane-modified polyurethane raw materials from Covestro allow formulations with excellent elasticity and superior cohesion.

In addition, PU-based joint sealants offer:

  • High adhesive strength, adhesion to different substrates
  • Good extrudability
  • Weather-resistance
  • Good elastic recovery
  • Low shrinkage during curing
  • Bubble-free curing due to low NCO content or silane crosslinking
  • Fast curing

One-component (1K), low modulus polyurethane sealants based on Desmodur® polyisocyanate polyurethane and Desmoseal® S silane-terminated polyurethane (STP) prepolymers are easy to apply and they are also paintable.

STPs also offer the best of both worlds. Desmoseal® S grades combine the outstanding properties of a polyurethane backbone with a silane-based curing mechanism and adhesion profile.

Desmoseal® M prepolymers have minimal bubble formation during curing.

We also offer other well-known and proven polyurethane raw materials for the production of construction sealants. 

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