🔍 Key Concepts

• Refractory materials used for high-temperature insulation on ships • Difference between fiber-based insulation and dense castable refractories • Role of binders (like clay or cement) that hold insulation fibers or grains together

💭 Think About

• Think about which option specifically mentions or implies a material that would be made from fibers held together by a binder, rather than a dense poured or troweled mix • Ask yourself: which of these products is commonly supplied as a lightweight, low-density insulation rather than a heavy, structural refractory? • Consider where on a vessel you would want a wool-like, blanket-type insulation versus a solid cast shape

✅ Before You Answer

• Identify which choice(s) are typically fiber/blanket-type insulation versus cast/poured refractories • Recall that wool fibers suggest a soft, lightweight, highly insulating product, not a heavy brick-like material • Verify whether any option is clearly a generic category that could include fiber-and-binder mixtures, and whether that would logically apply to all three choices or only one