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Ductile Iron Manhole Covers is more durable.

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PARAMETER	RCC	CI	FRP
Life Span	Low	Moderate	High
Strength / Weight Ratio	Very Low	Moderate	Very High
Cost	Low	Moderate	Comparable to CI
Scrap Value	Low	High	Nil (Zero Scrap Value)
Color Range	Concrete Gray	Black	Range Available
Logo Embossing	Not Available	Not Available	Possible
Custom Design/Size	Not Available	Not Available	Possible
Handling	Difficult	Difficult	Easy
Thermal Expansion	Negligible	High	Nil
Corrosion Resistance	Low	Medium	High
Abrasion Resistance	Nope	Nope	Yes

KEY: FRP: Fibre Reinforced Polymer / Plastic, RCC: Reinforced Cement Concrete, CI: Cast Iron