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PropertyCast IronBrassStainless SteelCostLowest (≈$2/kg)Medium (≈$6/kg)Highest (≈$3.5/kg, 304 SS)Corrosion ResistancePoor(requires epoxy coating)Moderate(fresh water/weak acid)Excellent(seawater/strong acids)Media CompatibilityWater, oil (pH 6-8)Potable water, mild liquidsChemicals,seawater,chlorina

When you wonder if an air pump or a water pump is better, the answer really depends on what you need at home. Air pumps move air, while water pumps move water—each has its own job. Many homeowners pick a pump for reasons like energy savings, quiet operation, or year-round comfort.Reason People Choos

PropertyCast IronBrassStainless SteelDensity(g/cm³)7.28.47.9Tensile Strength(MPa)250-400 (QT500)250-350 520-800 (316L)Damping Factor0.03-0.05 (best)0.01-0.020.005-0.01 (worst)Thermal Conductivity(W/m·K)40-5510915-20Thermal Expansion(10⁻⁶/K)111816-18Corrosion ResRequires coatingResists moistureExcell

PropertyBrassStainless SteelPPO PlasticDensity(g/cm³)8.47.91.06Tensile Strength(MPa)250-400520-800 (316L)65-85 (120 w/ glass fiber)Max Temp(℃)200400 (316L)110 (peak 130)Corrosion ResWeak in S/NH₃ mediaExcellent (PREN≥35)Resists all acidsCost★★★☆☆ (≈$21/kg)★★★★☆ (≈$6.3/kg)★★☆☆☆ (≈$11/kg)Max Velocity(

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