On this page
Hazen colour standards are used worldwide to measure and calibrate the colour of clear to slightly coloured liquids, most commonly in drinking water treatment, wastewater monitoring, and industrial process control. The Hazen scale, also known as the Platinum-Cobalt (Pt-Co) scale, provides a standardised reference for apparent and true colour measurements in water.
In water treatment works, colour is a critical indicator of organic content and treatment performance. Online colour analysers typically measure absorbance at 400 nm or within the UV spectrum to determine apparent colour. When turbidity correction is applied, true colour can also be assessed. To ensure these instruments remain accurate and compliant, they must be calibrated using certified Hazen colour standards manufactured in accordance with recognised methods.
Online Reagents is a UK manufacturer of Hazen colour standards to ASTM Method D1209, supplying laboratories, water utilities, and instrument manufacturers with fully traceable, quality-controlled reference solutions. With over 50 years of chemical manufacturing experience through PMA, Online Reagents provides a reliable, long-term supply partner for colour calibration standards that meet both regulatory and operational requirements.
Unlike generic laboratory suppliers, Online Reagents manufactures Hazen colour standards in-house, allowing full control over quality, consistency, traceability, and customisation. Standards are available in any Hazen value, with options for customer branding, bespoke safety data sheets, and certificates of analysis.
What Are Hazen Colour Standards Used For?
Hazen colour standards are primarily used for:
- Calibration and verification of online colour analysers
- Laboratory colour comparison and validation
- Drinking water intake protection monitoring
- Organic content monitoring in raw and treated water
- Quality control in industrial water and chemical processes
They are defined by ASTM Method D1209, which specifies preparation, measurement, and colour scale equivalence using platinum and cobalt reference chemistry.
Why Buy Hazen Colour Standards from Online Reagents?
Online Reagents is not a reseller. We are a manufacturer.
Key reasons customers choose Online Reagents include:
- Over 50 years of chemical manufacturing expertise via PMA
- In-house production to ASTM Method D1209
- Any Hazen value manufactured to order
- Full QC traceability and batch documentation
- Certificates of Analysis supplied as standard
- Bespoke MSDS and private labelling available
- Reliable UK-based supply for water utilities and laboratories
This manufacturing capability ensures consistency between batches, fast lead times, and confidence in long-term instrument calibration programmes.
Frequently Asked Questions
What is a Hazen colour standard?
A Hazen colour standard is a reference solution used to define colour intensity on the Hazen or Platinum-Cobalt scale. It is commonly used to calibrate colour measurement instruments for water and clear liquids.
What industries use Hazen colour standards?
They are widely used in drinking water treatment, wastewater treatment, environmental monitoring, laboratory analysis, and industrial process control, where colour is a regulated or critical parameter.
Are your Hazen colour standards compliant with ASTM methods?
Yes. Online Reagents manufactures Hazen colour standards in accordance with ASTM Method D1209, ensuring suitability for regulated and accredited applications.
Can you supply bespoke or branded Hazen colour standards?
Yes. We offer private labelling, customer branding, bespoke MSDS documentation, and full batch traceability, including certificates of analysis.
How do I order Hazen colour standards online?
Hazen colour standards can be ordered directly through the Online Reagents website. Select the required Hazen value, quantity, and packaging, then complete checkout online. For bespoke requirements or bulk orders, you can contact the team directly for a tailored quotation.
Do you manufacture custom Hazen values?
Yes. We manufacture Hazen colour standards to any specified value, allowing precise matching to analyser ranges or laboratory requirements.
Hazen colour standards play a critical role in accurate colour measurement for drinking water treatment, wastewater monitoring, and industrial process control. Reliable calibration depends on standards that are manufactured consistently, traceable, and compliant with recognised methods such as ASTM D1209.
Online Reagents manufactures Hazen colour standards in-house, offering any required Hazen value with full quality control, certificates of analysis, and long-term batch consistency. Backed by over 50 years of chemical manufacturing experience through PMA, Online Reagents provides a dependable UK-based supply for laboratories, water utilities, and instrument manufacturers that require confidence in their colour calibration standards.
For customers looking to buy Hazen colour standards online, Online Reagents offers a straightforward ordering process, technical support, and the assurance that comes from dealing directly with the manufacturer rather than a reseller.
If accuracy, traceability, and continuity of supply matter, Online Reagents is the correct source for Hazen colour standards.
