Blogs
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:
Do you have a source for EP Opalescence Standards?
Posted on by Ganesh Ramanathan
The reference document that defines the visual EP Opalescence scale is: EP 2.2 Physical and Physico-Chemical Methods for color and opalescence EP – European Pharmacopoeia, Section 2.2 Physical and Physico-Chemical Methods, Unit European Pharmacopeia, Strasbourg, France (1997: 15-16) www.pheur.org This method describes the visual evaluation of scattering or opalescence in near clear liquids, typically pharmaceutical, […]
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.
Measuring the Color of Clear Liquids
Posted on by Ganesh Ramanathan
HunterLab diffuse sphere instruments are often used to measure liquid samples, especially clear liquids. The liquid fragrance shown above is one such example of a clear liquid. The fragrances is so clear that is resembles water. Fragrances such as this are often added to cleaning supplies, air fresheners, or other consumer products. One of the […]
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 the Color of Clear Liquids
Posted on by Ganesh Ramanathan
One application that often comes up is measuring the color of clean liquids such as the fragrance sample seen above. This liquid fragrances is clear and looks almost like water. Fragrances such as this are often added to cleaning supplies, air fresheners, or other consumer products. One of the problems that this type of sample […]
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″.
What is the CP – Chinese Pharmacopeia Color Scale?
Posted on by Ganesh Ramanathan
FAQ: “More customers are asking us about Chinese Pharmacopeia Numbers… is this similar to EP/USP Color?
Do you have a source for Transparent Liquid Haze Standards?
Posted on by Ganesh Ramanathan
HunterLab Distributor FAQ: “I have a new pharma customer doing color measurements. They also want to do haze measurements and we had a discussion about haze standards. Would our plastic haze standards be fine or is there a liquid haze standard out there?”
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% […]