APHA/Hazen (Platinum-Cobalt) Color Standards
Originally created for the waste water industry, the APHA color scale has expanded to the chemical, pharmaceutical, beverage, plastic and petroleum industries. This color scale is also known as the Hazen scale as well as the PtCo scale. The APHA scale is typically used to identify purity of an end product, in many cases the goal is <10 APHA or “water white”. GFS Chemicals manufactures APHA 500 which can be diluted to create the necessary APHA values for your application. Some applications call for a visual check using sight sticks while others use UV/Vis spectrophotometers.
We can also pre-dilute the standard for you when given the APHA value needed.
Specification provided with all 500 APHA standards:
1. Absorbance (1 cm) @ 430 nm 0.110-0.120
2. Absorbance (1 cm) @ 455 nm 0.130-0.145
3. Absorbance (1 cm) @ 480 nm 0.105-0.120
4. Abosrbance (1 cm) @ 510 nm 0.055-0.065
