what is the difference between gi and gp pipes

 

Difference Between GI and GP Pipes

Both GI (Galvanized Iron) and GP (Galvanized Plain) pipes are steel pipes coated with zinc to protect them from rust and corrosion — but they differ in the process of galvanization, surface finish, and applications.

1. Manufacturing Process

  • GI Pipes (Galvanized Iron):
    Made by hot-dip galvanization. The steel pipe is dipped into molten zinc, forming a thick and uniform zinc coating on both the inside and outside surface.

  • GP Pipes (Galvanized Plain):
    Made by electro-galvanization. A thin layer of zinc is electroplated onto the surface of cold-rolled steel sheets before being formed into pipes. This process gives a smooth and shiny finish, but the coating is thinner than hot-dip GI.

2. Coating Thickness & Protection

  • GI Pipes: Have a thicker zinc coating (≈40–120 microns), offering stronger protection against rust and suitable for outdoor and underground use.

  • GP Pipes: Have a thinner zinc coating (≈5–20 microns), ideal for indoor or mild environments where heavy corrosion resistance is not required.

3. Appearance

  • GI Pipes: Dull grey, rougher finish.

  • GP Pipes: Bright, smooth, and shiny surface.

4. Applications

  • GI Pipes: Used in agriculture, borewells, water supply, fencing, and structural use.

  • GP Pipes: Preferred for furniture, automotive parts, household items, and indoor structures.

5. Cost

  • GP Pipes are usually cheaper due to the lighter zinc coating, while GI Pipes cost slightly more but last longer outdoors.

Summary Table

FeatureGI Pipes (Galvanized Iron)GP Pipes (Galvanized Plain)
ProcessHot-dip galvanizationElectro-galvanization
Coating Thickness40–120 microns (thick)5–20 microns (thin)
FinishDull grey, roughBright, smooth, shiny
DurabilityHigh corrosion resistanceModerate corrosion resistance
Best UseOutdoor, agriculture, borewell, water transportIndoor, furniture, light fabrication
CostHigherLower

In short:

GI Pipes = Heavy-duty, outdoor use
GP Pipes = Light-duty, indoor use

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