- Mineral oil are exracted from crude oil in distillation process.
- Mineral oil contain lot of contamination or substances which are no lub oil property to oil.
- Hydrocarbon molecule are non -uniform in crude oil.
- Synthetic oil is not distilled from crude oil .It is made through a chemical process known as Fischer Troph process.Starting with raw material like , methane ,CO,CO2 doesnot contain any contaminants and hydrocarbon molecule are uniform
1. High cost: Manganese bronze is a costly alloy, making it less economical for large propellers. 2. Low strength-to-weight ratio: Compared to other propeller materials like nickel-aluminum bronze or stainless steel, manganese bronze has a lower strength-to-weight ratio. 3. Susceptible to corrosion: Manganese bronze can corrode in seawater, especially when exposed to high velocities and turbulence. 4. Poor cavitation resistance: Manganese bronze is more prone to cavitation damage than other materials. 5. Difficult to cast and machine: Manganese bronze is challenging to cast and machine, making it less desirable for complex propeller geometries. 6. Limited weldability: Manganese bronze has poor weldability, making repairs and modifications difficult. Nickel-aluminum bronze or stainless steel are commonly used for propellers due to their: - High strength and durability - Excellent corrosion resistance - Good cavitation resistance - Ease of casting and machining - Weldability
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