Molybdate Cooling Water Treatment Test Strips

SKU: 33817-MOL

$17.95USD or lower Each

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Check molybdate corrosion inhibitor levels in cooling or boiler water for on-site monitoring procedures with fast, accurate Indigo® Molybdate Test Strips.

Monitor your molybdate-based corrosion inhibitors quickly and cost-effectively with Indigo® test strips. Each dip-and-read strip delivers a reliable color comparison within seconds, making them ideal for cooling water systems, boilers, and closed-loop heat exchangers where corrosion control is critical. No reagents, titrations, or meters are required; just fast, visible confirmation of treatment levels on-site or in the field.

Molybdate (MoO42-) acts as an anodic corrosion inhibitor, forming a protective oxide layer on metal surfaces, especially in multi-metal systems containing steel, brass, or copper alloys. Routine monitoring ensures the molybdate concentration stays within the recommended range (typically 50–150 ppm for closed-loop systems), preventing under-treatment (corrosion) or over-treatment (waste and discharge compliance issues). These molybdate test strips offer an efficient alternative to spectrophotometric or titrimetric molybdate test procedures, providing actionable results in less than a minute.

Molybdates are thermally stable and effective in aqueous systems such as cooling towers that are sensitive to a scaling & corrosive environment. They can protect surface conditions by providing excellent crevice & pitting corrosion protection for heat exchangers & closed loop cooling systems. They form a protective layer that is resistant to oxidizing biocides like chlorine. This molybdate test strip is an inexpensive but invaluable tool for confirming anodic and cathodic corrosion chemical inhibitors are present to limit electrochemical reactions and scale deposits. Water treaters are better able to meet environmental & safety restrictions.

Why Use Molybdate Test Strips?

  • Fast On-Site Testing: Avoid delays from lab analysis by verifying molybdate levels instantly for proactive corrosion control.
  • Maintain Compliance & Efficiency: Ensure optimal inhibitor dosage to meet corrosion standards while minimizing chemical waste.
  • Ideal for Multi-Metal Systems: Protects steel, brass, and copper alloys from pitting and galvanic corrosion.
System Type Operating Temp / Pressure Typical Molybdate Range Purpose
Closed-loop cooling < 80 °C, unpressurized 50–100 ppm Film-forming protection with minimal oxygen exposure
Boiler / condensate 100–250 °C, high pressure 150–300 ppm High-temperature corrosion control and film stability under blowdown
Details Specs Docs Reviews
Details
Feature Test Strips Laboratory Instruments
Analysis Time 30–60 seconds per sample 15–30 minutes including sample prep
Accuracy ±10–15% (suitable for field control) ±2–5% (research or regulatory precision)
Cost per Test Under $1 $10–$50 including reagents and labor
Required Equipment None Spectrophotometer, reagents, glassware
Best Use Routine plant checks and field service Detailed lab diagnostics and QA audits

Best Practices

  • Test daily or weekly depending on system load and inhibitor dosing rate.
  • Record readings to establish baseline molybdate consumption trends.
  • Verify make-up water and closed-loop samples separately.
  • Adjust dosage immediately if readings fall below target concentration.
Related information or images
Boiler Corrosion Inhibitor Control Test Strips

Closed-Loop Cooling Water

Molybdate Corrosion Inhibitor Test Strips

Boiler Treatment

Specifications
  • The number of strips (50) per vial is approximate.
  • These strips are extremely sensitive to airborne humidity.
  • Reseal the desiccant lined bottle immediately after removing a strip to ensure a minimum 3 year shelf life.
  • Made in USA & calibrated with NIST standards
Documentation

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Molybdate Test Strips Stability Statement Indigo Molybdate Test Strips Certificate of Analysis Indigo Molybdate Test Strips SDS
Reviews (1)
2026-04-29

Good product. Received product 29 Apr 26. Expiry date labeled 2028 10 14. Hopefully still good after that date. Will need to do a lot of testing to use all product before expiry date. Downside -- Shipping cost of $18.86 for item is costly. Would be nice if cheaper shipping option available. Only 3.5 stars for reasons above.

— Ben
— Indigo:

Thank you for review.  If stores properly per Stability document, strips can be used past the posted expiry of the bottle you have (2.5 years remaining).

33817-MOL-Stability.pdf (indigoinstruments.com)

Shipping is unfortunately due to high costs from carriers within Canada.  We charge what they charge us.

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