GRP Water Tank Accessories Material Selection – Stainless Steel or Galvanized Steel

Choose the right combination for durability, cost-efficiency, and performance.

Ⅰ. Core Material Options

We offer two premium materials for GRP water tank accessories include internal accessories and external accessories,

Most popular option as below:

Option1  ::  Hot-Dip Galvanized Steel (Both Internal + External )  ———- Lower Cost

Option 2 :: Stainless Steel( Internal )  + Hot-Dip Galvanized Steel (External)  ———- Middle Cost

Option 3 ::  Stainless Steel (Both Internal + External ) ———- High Cost

(Remark: Stainless steel steel grade include SS304/ SS316 / SS316L, if the water is not for drinking, we suggest the option 1, because the cost is lower more)

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Ⅱ. Material Application for Different Material

A. Internal Components

(In direct contact with stored water)

• Recommended Material: Stainless Steel

  • Superior corrosion resistance

  • Zero rust contamination risk

  • Ideal for potable water tanks

• Alternative: Hot-Dip Galvanized Steel (for non-potable/non-aggressive water)

B. External Fittings

(Exposed to environment/structural elements)

• Recommended Material: Hot-Dip Galvanized Steel

  • Cost-effective weather protection

  • Robust mechanical strength

  • Resists UV/atmospheric corrosion

• Premium Option: Stainless Steel (for coastal/industrial zones)

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Ⅲ. Hybrid Configuration (Most Popular!)

✓ Stainless Steel Internals + Hot-Dip Galvanized Externals

• The Balanced Solution:

  • Interior: Ensures water purity with stainless steel ladders, pipes & brackets.

  • Exterior: Provides structural durability for manholes, vents & reinforcements at lower cost.

• Benefits: Optimal price-to-performance ratio, certified for drinking water safety.

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Ⅳ. Quick Selection Table

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Ⅴ. Expert Tip

“For drinking water tanks, we strongly recommend stainless steel internals. Combine with galvanized externals to save 30% cost without compromising water quality.”
– Our Engineering Team