What are curing sealants?

What are curing sealants?

• A. Harden by chemical reaction when the catalyst is mixed with the base; after curing they are more resistant to solvents, petroleum products and high temperatures.
• B. Dry quickly when exposed to air.
• C. Are water-based.
• D. Do not harden.

Answer: (A)

Curing sealants harden through a chemical reaction between the base and the catalyst (hardener) when they are mixed. This reaction creates a cross-linked polymer network, turning the sealant into a solid that resists solvents, petroleum products, and high temperatures—qualities essential for aviation use where exposure to fuels and heat is common. If a sealant simply dried in air or was described as water-based, that indicates evaporation or moisture-curing rather than the chemical cross-linking that defines curing sealants. And of course, a sealant that “does not harden” would not provide the necessary seal and durability.

Curing sealants harden through a chemical reaction between the base and the catalyst (hardener) when they are mixed. This reaction creates a cross-linked polymer network, turning the sealant into a solid that resists solvents, petroleum products, and high temperatures—qualities essential for aviation use where exposure to fuels and heat is common. If a sealant simply dried in air or was described as water-based, that indicates evaporation or moisture-curing rather than the chemical cross-linking that defines curing sealants. And of course, a sealant that “does not harden” would not provide the necessary seal and durability.