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ISO 2470-1

Introducing ISO 2470-1 - Industrial Physics 

ISO 2470-1 is used to measure the diffuse blue reflectance factor (ISO brightness) of pulps, papers and boards. 

This ISO brightness testing standard is designed for comparing white and near white pulps, papers and boards. The reflectance factor, also known as the radiance factor, depends on the conditions of measurement, particularly the spectral and geometric characteristics of the instrument used.  

With the right equipment, measuring paper and pulp brightness is easy. Brightness is measured on a scale of 0 – 100 and the majority of paper we use commercially is somewhere between 80 and 100. Its brightness refers to how much light it reflects,and it can be measured by a machine that compares its reflectance against specific wavelengths.  

What is brightness testing?

Brightness was originally defined in the 1930s as a reflectance measurement in the blue part of the visible spectrum defined by TAPPI Test Method T452 to monitor the bleaching cycle. Subsequently, it has been used to characterize paper optical properties outside of just bleaching. 

The ISO 2470-1 testing principle 

To perform an ISO 2470-1 brightness test your sample is illuminated diffusely in a standard instrument. The light reflected is either allowed to pass through a defined optical filter and then measured by a photodetector, or it’s measured by an array of photosensitive diodes, with each diode responding to a different effective wavelength.  

The brightness is then determined directly from the output from the photodetector, or by calculation from the photosensitive diode outputs using the appropriate weighting function. 

ISO 2470-1 testing definitions

There are a few definitions within ISO 2470-1 that you’ll need to understand to perform a successful pulp and paper brightness test, these include: 

Radiance factor: the ratio of the radiance of a surface element of a body in the direction delimited by a given cone. The apex is at the surface element to that of the perfect reflecting diffuser under the same conditions of illumination. 

Diffuse radiance [reflectance] factor: the ratio of the radiation reflected and emitted from a body to that reflected from the perfect reflecting diffuser. Under the same conditions of diffuse illumination and normal detection intrinsic radiance [reflectance] factor 

ISO 2470-1 testing equipment

So, how can Industrial Physics improve your ISO 2470-1 pulp and paper brightness testing?  

Technidyne ColorTouch® PC
The ColorTouch® PC is a powerful color spectrophotometer that gives you complete control over the optical properties of your paper based products. Brought to you by Technidyne, our specialist optical, surface, and physical property testing brand, The ColorTouch® PC inspects everything from ISO brightness, color and color difference to fluorescence and opacity. 

Technidyne ColorTouch®X ISO
An advanced touchscreen color spectrophotometer that measures color difference, brightness, whiteness, opacity and more. The ColorTouch® X ISO uses methods that meet all of the most common ISO testing and TAPPI color spectrophotometer standards. 

Need ISO 2470-1 testing solutions? Get in touch

We’ve learnt a thing or two about pulp and paper brightness testing over the decades. Now Industrial Physics is recognized as a brand that likes to bring new, innovative brightness testing equipment to market, including color spectrophotometers. 

We like to share our knowledge and we’re here to help you to answer your questions about thickness testing. Across the knowledgebase section of our website we publish lots of blogs on related subjects. For example, here’s a blog that delves into how brightness and whiteness are related. You could follow this up with this piece on testing the physical and optical properties of paper. 

If you have any questions about ISO 2470-1 and how we can help you with your pulp and paper brightness testing, then please just get in touch!

Contact us - Industrial Physics

Your global test and inspection partner for ISO 2470-1