MMO Tubular Anode

MMO tubular anodes are generally titanium tubes coated with an electrocatalytic film of noble metal oxides. The mixed metal oxide film is a crystalline, electrically conductive coating that activates and enables the titanium substrate to function as an anode. Our MMO coating consists of Iridium-Tantalum oxides (IrO2/Ta2O5) or Iridium-Ruthenium oxides (IrO2/RuO2) and it has been proven to increase the anode design life.

MMO coatings are not affected by the generation of chlorine. Our high performance MMO tubular anode is extremely durable and can be used in severe conditions, including high acidity and in the presence of chlorine or oxygen. They are widely used for cathodic protection of metal structures in soil, mud, seawater, brackish water, fresh water, concrete, etc. For an improved current output, coke breeze is commonly used in anode beds, or the anodes can be prepackaged in canisters containing carbonaceous backfill, ready for direct installation.

MMO tubular anode is highly versatile, and is also widely used as an anti-fouling electrode in sewage water treatment. Moreover, MMO tubular anodes can be connected together in strings for the cathodic protection of internal storage tank walls.



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Quality Substrate Material
Our MMO tubular anode is manufactured from high-tensile seamless titanium tube, which meets ASTM B338 Grade 1 standards.

Noble Metal Oxide Coating
Whether operating in soil, fresh water, seawater or mud, mixed metal oxide coatings demonstrate high chemical stability, even in environments with a low pH value. The Ir–Ta mixed metal oxide catalyst is recommended for soil or freshwater, where there is either no chloride ions or low chloride ions present. The Ir-Ru mixed metal oxide catalyst is recommended for brackish and seawater. Based upon accelerated life testing, conducted by an independent laboratory, our MMO coating has been proven to have an increased life expectancy when compared with other similar products on the market. Differing coating thickness and different noble metal oxide ratios are available on request.

Low Electrical Resistance
The MMO anode has an extremely low consumption rate, measured in milligrams per ampere-year. The dimensions remain nearly unchanged throughout the design life of the anode, providing a consistently low resistance.

Low Maintenance Cost
MMO tubular anodes are a high performance anode specifically designed for harsh environments and areas where conventional installations and replacements would be economically or logistically restricted. When compared to other anode types, it can save up to 15%-35% of installation costs.

Wide Cable Selection
PVDF, HMWPE, HALAR, XLPE, PVC or KYNAR are all optional. We recommend dual-insulated cable(such as PVDF/HMWPE) for use in ground beds with high chloride concentration. While HMWPE is an economical choice for shallow vertical and horizontal surface beds with no chloride presence.

Long Working Life
The design life of the anode varies with the operating current supplied for the various applications.


Item No. Diameter Length Tube Wall Thickness
JA-MMO-T160 5/8″ (16 mm) 39.4″ (1000 mm) 0.04″ (1 mm)
JA-MMO-T190 3/4″ (19 mm) 39.4″ (1000 mm) 0.04″ (1 mm)
JA-MMO-T250S 1″ (25 mm) 19.7″ (500 mm) 0.04″ (1 mm)
JA-MMO-T250 1″ (25 mm) 39.4″ (1000 mm) 0.04″ (1 mm)
JA-MMO-T250L 1″ (25 mm) 60″ (1524mm) 0.04″ (1 mm)
JA-MMO-T320 1-¼″ (32 mm) 48″ (1220mm) 0.04″ (1 mm)
JA-MMO-T500 2″ (50 mm) 47.2″ (1200mm) 0.04″ (1 mm)

Remarks: Other configurations are available on request.

Main Technical Parameters




Iridium Oxide (IrO2), Ruthenium Oxide (RuO2), Tantalum Oxide (Ta2O5)




Deep Well, Storage Tank


Brackish Water, Fresh Water, Seawater, Shallow Vertical Groundbed, Soil

Design Life

25 years


We employ rigorous foundry internal testing standards to ensure the optimum lifespan and performance of our Anodes. Each anode is labelled with a unique serial number for quality tracking. Third party testing is conducted by customer’s special request at extra charge.

Technical Measurement Chemical Composition Electrochemical Performance Physical Properties
Testing Standard ASTM E120 NACE TM0108 / ASTM D3359 Foundry ITP
Testing Content Chemical Analysis Current Output / Anode Life Dimensions & Weight / Coating Thickness
Equipment Optical Emission Spectrometer OBLF QSN 750 JCM-6000 Plus Scanning Electron Microscope / DWW-K-100 Galvanostat / VCC101A Multimeter Calibrated Digital Measuring Devices