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When do I use Specular Exclusion in Color Measurement?

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What is a visual limit for Haze%?

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ASTM Industrial Test Methods for visual and instrumental APHA Color Scale

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Do you have a source for a Sample Conditioning Cabinet for Heat and Humidity?

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What standard do I use to verify Yellowness Index Performance?

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What resources are available for making plaques and sheets from plastic pellets?

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References for Hazen Color Scale

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When do I use Specular Exclusion in Color Measurement?

Posted on May 23, 2014 by Ken Phillips

FAQ: ASTM D6290 recommends that I measure my plastic pellets for yellowness using the specular exclude mode. What is this? Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several industries. Today, he is the global market development manager for HunterLab, focused on […]

Posted in Plastic, UltraScan PRO, UltraScan VIS Tagged clear window, glass correction, granules, oapque liquids, opaque, pellets, powder, reflectance specular excluded, reflectance specular included, RSEX, RSIN, specular exclusion, specular reflectance, translucent Leave a comment

What is a visual limit for Haze%?

Posted on February 7, 2014 by Ken Phillips

FAQ: “What is a visual limit for Haze%? When should I be able to see a difference in a sample?” A perfect clear of 0% would be air for transparent solids and the transmission cell of a defined path length filled with DI water for transparent liquids. It should also be noted that the Haze% […]

Posted in Chemical, Color and Appearance Theory, Pharmaceuticals, Plastic, UltraScan PRO, UltraScan VIS Tagged clear, haze, hazey, scattering, total transmission, transmission haze Leave a comment

ASTM Industrial Test Methods for visual and instrumental APHA Color Scale

Posted on August 18, 2013 by Ken Phillips

FAQ: “Does HunterLab have any documentation to show that the UltraScan VIS is compliant with ASTM 1209. One of our customers is having a problem regarding the method. Their client is using the manual visual method for performing the ASTM 1209 color test method whereas they use the UltraScan VIS. Can you explain the difference?” […]

Posted in Chemical, Pharmaceuticals, Plastic, UltraScan PRO, UltraScan VIS Tagged APHA, cell path length, Hazen, Platinum Cobalt, Pt-Co, PtCo, references, transmission cell Leave a comment

Do you have a source for a Sample Conditioning Cabinet for Heat and Humidity?

Posted on June 25, 2013 by Ken Phillips

FAQ: “… I just need to find a way to better condition the samples for consistency. I  can get some pretty consistent results on my own, but once it’s in a general QC lab, it’s going to need some standardization.” Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, […]

Posted in Color and Appearance Theory, Paper, Pharmaceuticals, Plastic, Textiles Tagged conditioning, conditioning cabinet, humidity, thermochromic Leave a comment

What standard do I use to verify Yellowness Index Performance?

Posted on March 11, 2013 by Ken Phillips

There are no physical liquid standards specifically designed to verify the Yellowness Index of liquid samples over time. Yellowness Index is defined as a mathematical function such that a perfect clear of 100% transmission, typically represented by the transmission cell filled with DI water, will have a YI value of 0. However, a good workaround solution […]

Posted in Chemical, Pharmaceuticals, Plastic Tagged APHA, Hazen, liquid color standard, Pt-Co, Yellowness Index, YI Leave a comment

What resources are available for making plaques and sheets from plastic pellets?

Posted on February 28, 2013 by Ken Phillips

Presses used for molding plastic plaques and sheets from pellets typically have heating/cooling platens and a programmable controller. Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several industries. Today, he is the global market development manager for HunterLab, focused on understanding customer […]

Posted in Accessories and Parts, Plastic Tagged Acetal plastics, pellets, PET (poly(ethylene terephthalate)), plaque, PMMA (poly(methyl methacrylate), Polyalkylene terephthalates, Polyamide (PA); Polycarbonate (PC), Polypropylene (PP); Thermoplastic elastomers (TPE), sheet Leave a comment

References for Hazen Color Scale

Posted on January 23, 2013 by Ken Phillips

The original references were written by Allen Hazen, a chemist who first defined APHA/Pt-Co/Hazen color scale for the evaluation of water quality on behalf of the American Public Health Association: Hazen, A. A new color standard for natural waters, American Chemist Journal (14:300), 1892. Hazen, A. The measurement of the colors of natural waters, American […]

Posted in Chemical, Color and Appearance Theory, Pharmaceuticals, Plastic Tagged APHA, Hazen, liquid color scale, Platinum Cobalt, Pt-Co, PtCo Leave a comment
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