Blogs
Carbon Blackness [My], Jetness [Mc], Undertone [dM] and Tint Strength [T]
Posted on by Ganesh Ramanathan
“Carbon black, also called charcoal black lamp black, pigment black, soot or black carbon, is a fine particle carbon pigment obtained as soot from the incomplete combustion of many different types of organic materials, such as natural gas, or oil. Carbon black is usually a fine, soft, black powder. It is very stable and unaffected […]
How do you validate a APHA/Pt-Co/Hazen 500 liquid color standard?
Posted on by Ganesh Ramanathan
As described in Section 6 of ASTM D1209, there are 2 criteria to validate a APHA/Pt-Co 500 standard:
Is it possible to create ASTM traceable haze standards above 30%?
Posted on by Ganesh Ramanathan
The current, available ASTM D1003 Haze Standards have nominal Haze% values of 1, 5, 10, 20 and 30 with air (transparent solids) or the transmission cell filled with DI water being 0 (transparent liquids). Here are some thoughts on further options.
The details of how HunterLab sphere instruments conform to ASTM D1003 Section 8: Procedure B Spectrophotometer for transmission haze measurement
Posted on by Ganesh Ramanathan
HunterLab sphere instruments with CIE d/8 geometries conform to the requirements of ASTM D1003 Section 8: Procedure B Spectrophotometer. The measurement of transmission haze using Procedure B instruments will be in close agreement with ASTM D1003 Procedure A Haze meter. Here is a more detailed description of how the HunterLab UltraScan PRO, UltraScan VIS and […]
How is ASTM D1003 Transmission Haze measured at levels > 30%?
Posted on by Ganesh Ramanathan
FAQ: “We have a scientist here who is looking at films containing small bubbles and attempting to do measure them by measuring Haze% on a HunterLab spectrophotometer. I suspect her problem in obtaining numbers that “make sense” from what you get from just eyeballing the samples (and trying to look through them at the outlines […]
Measuring Molded Plastic Parts
Posted on by Ganesh Ramanathan
HunterLab has instrument and sample handling devices to meet almost any customer needs. One such need that we are able to meet is the measurement of molded plastic parts, such as the one pictured above. These plastic parts are actually covers for a stud finder tool. The nature of these parts presents a few difficulties […]
Do you know of an independent test lab that can measure APHA/Pt-Co/Hazen Color?
Posted on by Ganesh Ramanathan
Contact the following and ask for “APHA/Pt-Co/Hazen Color testing per ASTM D1209 and D5386″.
When do I use Specular Exclusion in Color Measurement?
Posted on by Ganesh Ramanathan
FAQ: ASTM D6290 recommends that I measure my plastic pellets for yellowness using the specular exclude mode. What is this?
What is a visual limit for Haze%?
Posted on by Ganesh Ramanathan
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% […]
ASTM Industrial Test Methods for visual and instrumental APHA Color Scale
Posted on by Ganesh Ramanathan
FAQ: “Does HunterLab have any documentation to show that the ColorQuest XE 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 ColorQuest XE. Can you explain the difference?”
Do you have a source for a Sample Conditioning Cabinet for Heat and Humidity?
Posted on by Ganesh Ramanathan
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.”