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ASTM D4890 - STANDARD TEST METHODS FOR POLYURETHANE RAW MATERIALS: DETERMINATION OF GARDNER AND APHA COLOR OF POLYOLS Organization: ASTM
Date: 2013-04-01
Description: These test methods measure visually the color of clear polyester and polyether liquids. They apply only to materials whose colors have light-absorption characteristics similar to those of the standards.
ASTM D4877 - STANDARD TEST METHOD FOR POLYURETHANE RAW MATERIALS: DETERMINATION OF APHA COLOR IN ISOCYANATES Organization: ASTM
Date: 2014-08-01
Description: This test method measures the color of clear liquids. It is applicable only to materials whose color-producing bodies have light-absorption characteristics similar to those of the platinum cobalt color standards used.2 (See Test Method D1209 and Note 1.)
ASTM D4877 + REDLINE - STANDARD TEST METHOD FOR POLYURETHANE RAW MATERIALS: DETERMINATION OF APHA COLOR IN ISOCYANATES - INCLUDES STANDARD + REDLINE (PDF) Organization: ASTM
ASTM D4890 + REDLINE - STANDARD TEST METHODS FOR POLYURETHANE RAW MATERIALS: DETERMINATION OF GARDNER AND APHA COLOR OF POLYOLS - INCLUDES STANDARD + REDLINE (PDF) Organization: ASTM
CEN - EN ISO 6271 - CLEAR LIQUIDS - ESTIMATION OF COLOUR BY THE PLATINUM-COBALT COLOUR SCALE Organization: CEN
Date: 2015-12-01
Description: NOTE The term “Pt-Co colour” used here is preferred over the terms “Hazen colour” and “APHA colour”.
DS/EN ISO 6271 - CLEAR LIQUIDS - ESTIMATION OF COLOUR BY THE PLATINUM-COBALT COLOUR SCALE Organization: DS
Date: 2016-01-06
Description: NOTE The term "Pt-Co colour" used here is preferred over the terms "Hazen colour" and "APHA colour".
DIN EN ISO 6271 - CLEAR LIQUIDS - ESTIMATION OF COLOUR BY THE PLATINUM-COBALT COLOUR SCALE (ISO 6271:2015) Organization: DIN
Date: 2016-05-01
Description: NOTE The term “Pt-Co colour” used here is preferred over the terms “Hazen colour” and “APHA colour”. 
ISO 6271 - CLEAR LIQUIDS - ESTIMATION OF COLOUR BY THE PLATINUM-COBALT COLOUR SCALE - THIRD EDITION Organization: ISO
Date: 2015-12-01
Description: NOTE The term "Pt-Co colour" used here is preferred over the terms "Hazen colour" and "APHA colour".
NPFC - MIL-E-24617 - EDTA HARDNESS TESTING REAGENTS, BOILER FEEDWATER, SHIPBOARD USE Organization: NPFC
Date: 1995-06-01
Description: AMERICAN PUBLIC HEALTH ASSOCIATION (APHA) Standard Method 4500-S2- Sulfide (Application for copies should be addressed to the American Public Health Association, 1015 Fifteen Street, NW, Washington, DC 20005.)

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