Sodium silicate-based adhesive CP-97 is used for fabricating fitting covers with which material?

• A. Fiberglass
• B. Mineral wool
• C. Calcium silicate
• D. Concrete

Answer: (C)

The key idea is adhesive-material compatibility for high-temperature, inorganic insulation applications. Sodium silicate–based CP-97 bonds most effectively to calcium silicate because calcium silicate has a ceramic-like, silica-rich surface that readily bonds with an inorganic binder. This combination creates a durable, heat-resistant joint suitable for fabricating fitting covers that must withstand elevated temperatures and thermal cycling.

Fiberglass and mineral wool are fibrous insulations with different surface chemistries, and they usually require other types of adhesives or mechanical methods to achieve a reliable bond. Concrete presents a very rough, alkaline substrate and generally isn’t the intended matched material for this specific adhesive system in fabricating fitting covers. So the material that CP-97 is best used with in this context is calcium silicate.