Here are some key advantages of using black malleable iron pipe fittings 90 degree elbow:

Strength

Malleable iron is a strong yet flexible material that can withstand pressure/vibration.

Durability

Properly installed elbows can last 50+ years, outperforming plastic or copper fittings over the long-run.

Chemical resistance

Elbows maintain integrity when handling various liquids including water, chemicals, and corrosive gases.

Temperature resistance

Suitable for pipes carrying fluids from cryogenic to over 500°F.

Threading

Standard NPT/BSP tapered threading allows secure connections to other metal pipes/fixtures.

Pressure rating

Most elbows are rated for pressures over 250 PSI and higher for demanding applications.

Vibration resistance

Malleable iron is less prone to developing leaks from shaking or movement in the piping.

Cost-effective

Provide value through a long service lifetime compared to initial material cost.

Easy installation

Elbows can spin 360° during assembly and are widely available wherever pipe is used.

Their proven performance, reliability and versatility make malleable iron 90s suitable for plumbing and industrial piping applications.