The standard utilizes three specific angles (geometries) to categorize the gloss level of a surface: 60° (Universal)
[ 20° Geometry ] --> High-Gloss Surfaces (> 70 GU) [ 60° Geometry ] --> Universal / Medium Gloss (10 - 70 GU) [ 85° Geometry ] --> Low-Gloss / Matte Surfaces (< 10 GU) 1. The 60° Geometry (The Universal Angle) Medium-gloss surfaces.
Elena grabbed the printout of Thorne’s report. "He’s claiming a 20-degree angle measurement. Look at the new PDF, Marcus. Paragraph 7.2. For surfaces above 70 GU, you have to validate with the 20-degree geometry, but you must calibrate the instrument with a high-gloss black glass standard with a refractive index of 1.567." astm d523 pdf new
Best suited for flat, clean, and homogeneous specimens.
Marcus’s eyes widened. "It would read the truth." The standard utilizes three specific angles (geometries) to
To help me tailor any specific calculations or instrument advice for your lab, tell me:
"Run it again," Elena said.
Using the latest ASTM D523 PDF offers several benefits, including:
The standard utilizes three specific angles ( 20∘20 raised to the composed with power 60∘60 raised to the composed with power 85∘85 raised to the composed with power ) to evaluate different gloss levels. Paragraph 7