Elastic and flexible protection
Polyurethane raw materials for sealant solutions
Sealants need to be flexible and durable. Polyurethanes and silicones are widely recognized to provide flexibility and durability, but with different sets of properties. With silane-terminated polyurethane raw materials, long-lasting, elastic sealant formulations are possible.
Desmoseal® polyurethane and silane-terminated polyurethane (STP) prepolymers from Covestro can be formulated into sealants with low volatile organic compound (VOC) content, excellent elasticity, adhesion and physical properties. They provide:
- Low VOC content
- No shrinkage
- Flexibility, even at low temperatures
- Excellent physical properties
- High reactivity
- Easy application
Desmoseal® STP prepolymers combine the cohesive properties of polyurethanes with the adhesive properties of silanes.
Based on polyurethane prepolymers terminated by specific and unique trifunctional alkoxy-silane end-groups, hybrid Desmoseal® S prepolymers are used for the formulation of one-component (1K) moisture curing elastic adhesives and extremely flexible one-component (1K) sealants. Two-component (2K) formulations are possible. The formulated sealants do not foam when applied to a wet substrate.
The outstanding flexibility and durability of Desmoseal® polyurethane prepolymers make them ideal for use in sealants for construction, automotive, marine, industrial and do-it-yourself applications.
Desmoseal® M polyurethane prepolymers contain only a small percentage of polyisocyanate groups, leading to bubble-free curing.
Arcol® and Acclaim® polyol raw materials can be used to manufacture prepolymers used in moisture curing 1K and 2K sealants.
Desmophen® NH aspartic ester amines are used in 2K polyurea sealants to control reactivity and eliminate/reduce foaming. Polyurea sealants based on aspartic esters increase productivity by curing quickly and cure at low temperatures allowing for extension of the outdoor working season.
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Product Overview, Products for reaction with polyisocyanates