Knowledge Base
TAPPI T525
Introducing TAPPI T525 – Industrial Physics
TAPPI T525 is a TAPPI international testing method to determine the diffuse brightness of paper, paperboard and pulp.
This TAPPI brightness test of paper offers you a simple single-number index for measuring the brightness of white, near-white, and naturally colored samples. This includes all naturally-colored pulps, and papers and boards made from them.
TAPPI T525 brightness testing isn’t suitable for colored papers. This includes paper or paperboard that contains added coloring matter such as yellow or green dyestuff. That’s because these additives absorb light in the part of the spectrum extending from about 400 to 500 nm.
If you’d like to compare colored materials, then be sure to check out TAPPI T524 ‘Color of Paper and Paperboard (45/0 Geometry)’ and TAPPI T527 ‘Color of Paper and Paperboard (d/0 Geometry)’.
How is brightness defined?
Brightness is a commonly used term to define the numerical value of the reflectance factor of a sample with regards to its blue light of specific spectral and geometric characteristics. To carry out a TAPPI T525 brightness test you’ll need a brightness tester that employs diffuse illumination and 0° viewing geometry.
Measuring diffuse reflectance
Diffuse reflectance is measured within the wavelength range of 400-520 nm with an effective wavelength of 457 nm.
To measure diffuse reflectance you’ll need a suitable filtering device that will modify the spectral response and an instrument with diffuse illumination and perpendicular observation geometry. The diffuse reflectance measurements you note are made in terms of absolute reflectance factors.
TAPPI T525 brightness testing devices
So, how can Industrial Physics improve your TAPPI T525 brightness testing?
A powerful color spectrophotometer designed for measuring color/color difference/TAPPI brightness/whiteness, the ColorTouch® X 45 brightness tester also features an integrated touchscreen, advanced data analysis and sample tracking.
PROFILE/Plus® TAPPI Brightness
Automated TAPPI Brightness measurement in accordance with TAPPI T525. Our brightness tester offers fully-automated measurement of top and/or bottom brightness and fluorescence. Includes paper feed for automated profile testing.
Need TAPPI T525 brightness testing solutions? Get in touch
We like to dazzle the competition when it comes to the strength of our brightness test and inspection equipment. Now Industrial Physics is recognized as a brand that likes to bring new, innovative brightness testers to market.
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, you could try this blog on how brightness and whiteness are related. Then follow up with this report on optical testing application information for paper and paperboard.
If you have any questions about TAPPI T525 and how we can help you with your brightness testing, then please just get in touch!
Contact us – Industrial Physics
Your global test and measurement partner for TAPPI T525
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