🔍 Key Concepts

• Properties of plastic vs castable refractory materials • How refractory materials are applied in tight or irregular spaces • Differences between moldable/rammable materials and those needing forms and full casting

💭 Think About

• Think about which option can be rammed, pounded, or hand‑packed into place for a quick patch in a small, odd‑shaped area. • Ask yourself which material generally requires forms, mixing with water, and curing, making it less convenient for small spot repairs. • Consider where chrome-bearing refractories are normally used and whether they are typically chosen for simple small repairs in general service areas.

✅ Before You Answer

• Verify which material is described as plastic and can be installed by hand molding or ramming without forms. • Check which products are usually sold for patching and small-area repairs, not for lining large furnace sections. • Confirm which materials are more suitable for general fireclay service rather than specialized high‑temperature or chemical‑resistant chrome applications.