Polyurethane sealants for elastic and durable solutions in many applications

The one-component polyurethane sealants based on the Desmoseal® product range provide excellent elasticity combined with a good cohesion. Those sealants can be overcoated and are easy to apply. Desmoseal® M types contains only few isocyanate groups in order to avoid bubble-formation during the curing process.










Silane terminated prepolymer sealants - The best of both worlds: silicones and polyurethanes
The products of the Desmoseal® S range are silane-terminated prepolymers (STP) that combine the outstanding properties of polyurethanes with those of silicone based sealants. The inherent good cohesion of polyurethanes combined with the well-known good adhesion of silicones result in a unique property profile. STPs are usually formulated as one-component sealants, although they might be formulated as two-component systems to modify certain properties as well. The chemical structure is a polyurethane backbone with silane end groups.

More on silane terminated prepolymers here.

Feature: Solvent-free sealant creates smooth concrete surface for coating
One of the galling glitches of hardened concrete structures is the “bughole,” a small hollow caused by a bubble of air trapped against the side of the support form as the concrete hardens, leaving a permanent void in the finished surface. Bugholes pose a significant problem when applying high-performance coatings to concrete surfaces and need to be filled in order to achieve a smooth finished coating. Desmoseal® S XP 2636 silane-terminated polyurethane prepolymer by Bayer MaterialScience is used as a base resin in a solvent-free one component sealant ideal for eliminating bugholes in concrete surfaces..... more

Also, have a look at the section on crack-injections and pouring compounds in our coatings websites.

Get this additional information on raw materials for sealants:

Customer Presentation:	"Technical Customer Presentation Adhesive and Sealant Materials"
Presentation for FEICA, Sept. 2008	"New PU-Raw Materials for Adhesives and Sealants without R 40 labeling"
Brochure:	Prepolymers - Products & Applications