We offer epoxy‑coated cast iron pipe, engineered to offer exceptional durability and corrosion resistance in demanding water, waste, and drainage systems. By combining the proven strength of cast iron with a resilient epoxy barrier, we deliver reliable solutions suitable for municipal, industrial, and commercial applications.
✅ Key Features
-
Superior Corrosion Protection
The epoxy layer forms a seamless, chemically inert barrier that shields cast iron from moisture, chemicals, and aggressive drainage fluids. The epoxy layer forms a seamless, chemically inert barrier that shields cast iron from moisture, chemicals, and aggressive drainage fluids. -
Robust Mechanical Strength
The underlying cast iron core maintains high compressive strength and sound attenuation—ideal for both buried lines and above‑ground installations. -
High-Temperature Resistance
Certified epoxies withstand up to 300 °F (149 °C) in steam conditions, with interior coatings of 5 mil and exterior coatings around 2.5 mil for added ruggedness. -
Industrial and Municipal Certification
Conforms to EN 877, CISPI 301, ASTM A888 standards and often meets NSF/ANSI 61 water quality requirements. -
Smooth Flow Characteristics
The epoxy-coated surface maintains excellent hydraulic performance and resists scaling, ensuring long-term flow efficiency. -
Extended Service Life
With epoxy durability and cast iron resilience, service life typically exceeds 50 years.
📐 Dimensions & Technical Specifications
| Nominal Size (DN / in) | OD (mm/in) | Wall Thickness (mm/in) | Interior Epoxy (mil) | Exterior Epoxy (mil) | Pressure Rating |
|---|---|---|---|---|---|
| DN 40 / 1½″ | 48 mm / 1.9″ | 3.0 mm / 0.12″ | 5 mil | 2.5 mil | Gravity drainage |
| DN 100 / 4″ | 110 mm / 4.3″ | 3.5 mm / 0.14″ | 5 mil | 2.5 mil | Gravity drainage |
| DN 150 / 6″ | 160 mm / 6.3″ | 4.0 mm / 0.16″ | 5 mil | 2.5 mil | Gravity drainage |
| DN 200 / 8″ | 210 mm / 8.3″ | 5.0 mm / 0.2″ | 5 mil | 2.5 mil | Gravity drainage |
| DN 300 / 12″ | 326 mm / 12.8″ | 6.0 mm / 0.24″ | 5 mil | 2.5 mil | Gravity drainage |
Data per EN 877 standards; epoxy specifications from leading suppliers.
🔧 Coating Process & Materials
-
Surface Preparation
Pipes are grit‑blasted to Sa 2½ standard, removing mill scale and ensuring strong epoxy adhesion. -
Interior Epoxy Application
A 5‑mil, NSF/ANSI 61‑compliant liquid epoxy is uniformly applied to prevent internal corrosion. -
Exterior Epoxy Overcoat
A 2–3 mil finish protects against external environment, below‑ground moisture, and handling. -
Curing & Quality Assurance
Coatings are heat-cured per standards. Adhesion testing per ASTM D4541 (≥1933 psi) assures durability.
⚙️ Performance Data
| Characteristic | Value / Test Standard |
|---|---|
| Interior ep. thickness | 5 mil (0.13 mm) |
| Exterior ep. thickness | 2.5 mil (0.06 mm) |
| Temperature resilience | Up to 300 °F steam rating |
| Chemical resistance | pH 2 (sulfuric acid) and pH 12 (lye) for 30 days |
| Adhesion strength | ≥1933 psi per ASTM D4541 |
| Coating hardness | >8 H pencil hardness ASTM D3363 |
| Certification Standards | EN 877, ASTM A888/CISPI 301, NSF/ANSI 61 |
🛠 Application & Installation
-
Suitable for: gravity‑flow sewage, stormwater, soil and waste, not pressurized potable water.
-
Joint types: no‑hub, flexible couplings, and precision-machined spigots meeting EN 877 tolerances.
-
Installation process: identical to standard cast iron pipe, with added care to avoid coating damage.
-
Maintenance: inner flow remains smooth; resistant to hydro‑jetting and cleaning.
⚖️ Comparison with Other Pipe Types
| Property | Epoxy‑Coated Cast Iron | Bare Cast Iron | PVC/HDPE |
|---|---|---|---|
| Corrosion Resistance | Excellent (sealed epoxy) | Poor | Excellent (non‑metallic) |
| Mechanical Strength | Very high | Very high | Moderate |
| Temperature Range | Up to 300 °F | Up to 400 °F | ~140 °F |
| Life Expectancy | 50+ years | 50+ years | 25–50 years |
| Flow Efficiency | Very good | Good | Excellent |
| Chemical Resistance | Broad-spectrum | Limited | Good |
| Cost | Moderate to high | Low–moderate | Low |
💱 Global Price Comparison (per tonne)
| Region/Supplier | Price (USD/tonne) | Remarks |
|---|---|---|
| China (Dinggin hardware, EN 877) | 900–1,100 | MOQ 25 t, includes powder/liquid epoxy |
| China average (Made-in-China) | 900–1,050 | Similar MOQ; high-end variants |
| Alibaba OEM (EN 877, factory direct) | 1,200–1,250 | Bulk discounts above 80 t |
| Ductile iron epoxy (6″) – China | 332–485 | Lower grade vs cast iron |
🎯 Ideal Applications
-
Municipal sewage and stormwater systems
-
Commercial buildings: soil, waste, and vent stacks
-
Industrial facilities: chemical drains, steam condensate
-
Hospitals/labs: resistant to aggressive waste fluids under EN 877 certification.
⚠️ Considerations & Limitations
-
Structural vs non‑structural lining
Non‑structural epoxy adds corrosion protection but doesn’t reinforce structurally. Structural CIPP lining is separate technology. -
Coating damage during handling
Pipe ends may need touch-up coatings to maintain barrier integrity. -
Repair complexity
If epoxy lining is damaged post-installation, field restoration is more involved than with PVC or bare iron. -
Not pressure-rated
Designed for gravity flow, not pressurized potable or industrial water mains.
❓ Frequently Asked Questions
-
What distinguishes epoxy coating from structural lining?
Epoxy coating adds a corrosion barrier (5 mil interior), while structural CIPP adds a thick cured liner that can restore pipe strength. -
Can it handle hot fluids?
Yes—up to 300 °F steam lines are tested successfully. -
How well do chemical drains resist corrosion?
They resist pH 2 (acid) to pH 12 (alkaline) for 30 days testing. -
Does epoxy reduce pipe diameter significantly?
The 5‑mil layer reduces ID by ~0.13 mm—negligible hydraulically. -
Is epoxy-coated cast iron easy to maintain?
Yes. Inner surfaces are smooth, resist buildup, and can be cleaned with hydro‑jets without damage.
We are confident our epoxy‑coated cast iron pipes offer the ideal balance of structural integrity and corrosion protection required in modern infrastructure. Certified to global standards, applicable across industries, and competitively priced worldwide, they present an outstanding choice for long-lasting drainage systems.
For custom sizing, jointing options, detailed technical datasheets, or volume pricing, please reach out to our engineering team—we’re happy to assist.