Once the chemical reaction is complete and the spray foam is fully cured, the material becomes chemically inert and no longer emits any gaseous emissions. This stability results from an irreversible chemical reaction.
Spray Foam Chemistry
Polymerization Reaction
Spray foam is created by the reaction of two components: a polyol and an isocyanate. When these two substances are mixed, an exothermic chemical reaction occurs, creating a stable, cross-linked molecular structure.
Complete and Irreversible Reaction
This polymerization reaction is complete and irreversible. Once all reactive groups have been consumed in the reaction, no volatile components remain that could evaporate or release gases.
Stable Molecular Structure
Strong Chemical Bonds
The structure of cured spray foam is composed of extremely stable urethane bonds. These chemical bonds are so strong that they don't break under normal use conditions, even over decades.
Solvent-Free
Unlike some products that use solvents for application, spray foam contains no volatile solvents. The foam is formed by a direct chemical reaction, without diluting agents that could evaporate later.
Curing Duration
Initial Drying Time
Spray foam cures quickly, generally within minutes after application. However, complete curing, also called cure, can take up to 24 hours depending on ambient conditions.
After Curing
Once fully cured, the spray foam is completely stable and can be covered with finishing materials. There is no risk of subsequent off-gassing, even after years of use.
Safety Guarantee
This chemical stability is why spray foam is approved for use in residential and commercial buildings. Rigorous tests have confirmed the absence of emissions after curing, guaranteeing healthy indoor air quality.