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Standards

ISO 2470-2

Introducing ISO 2470-2 - Industrial Physics

ISO 2470-2 is used to measure the brightness of pulps, papers and boards in outdoor daylight conditions, which is known as D65 brightness. 

This ISO standard was designed for paper brightness testing of white and near-white pulps, papers and boards, particularly those exhibiting fluorescence. To carry out an effective ISO 2470-2 test you’ll need an appropriately adjusted instrument like a color spectrophotometer. 

What is brightness testing?

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

The ISO 2470-2 testing principle

When performing an ISO 2470-2 test your sample is illuminated diffusely in a standard color spectrophotometer instrument. The light reflected from the surface 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. Each of these diodes responds 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. 

The source employed in ISO 2470-2 excites almost twice as much fluorescence as the illuminant in ISO 2470-1. Consequently, ISO 2470-2 is better suited for measuring the fluorescent contribution to the brightness.  

If you need to undertake brightness testing of papers and pulps viewed under indoor conditions then check out the brightness testing approach, described through the first part of this ISO standard through ISO 2470-1.  

ISO 2470-2 testing definitions

There are a few definitions within ISO 2470-2 that you’ll need to understand to perform a successful pulp and paper brightness test, these include: 

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: the diffuse radiance [reflectance] factor of a layer or pad of material thick enough to be opaque, i.e. such that increasing the thickness of the pad by doubling the number of sheets results in no change in the measured radiance (reflectance) factor. 

D65 brightness: the intrinsic radiance (reflectance) factor measured with a reflectometer having the characteristics described in ISO 2469. 

ISO 2470-2 testing equipment

So, how can Industrial Physics improve your ISO 2470-2 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 9073-2 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 brightness 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 2470-2 and how we can help you with your pulp and paper brightness testing, then please just get in touch!

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