What does heat damage do?

• A. Causes rust on metal fittings
• B. Jacket scorched; lining burns, hardens, and cracks.
• C. Softens the jacket for easier handling
• D. Improves heat resistance

Answer: (B)

Heat damage to a hose means the heat has altered the hose materials in a way that weakens its structure. The jacket can show scorch marks, the lining can burn and become hard, and the material can crack. This happens because the rubber and fabric reinforcement lose elasticity and become brittle when exposed to high temperatures, so the hose becomes stiff, leaks are more likely, and it may fail under pressure. It’s not about rusting metal fittings, which is a separate issue, and heat doesn’t make the jacket softer or add heat resistance—the damage described is the opposite: damage that reduces performance and safety.