Materials and Construction
Duriron is

Acid resistant, brittle and very hard
High silicon iron
All of these
Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion

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Materials and Construction
Lead is

Not used as pigment (in its compound forms) for paints
Used as a shock absorber (in mattress form) between the foundation an steel framework of skyscrapper buildings
Not resistant to corrosion
Used as a cathodic material

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