Phenol Red CAS NO.143-74-8

item

standard

appearance

dark red crystalline powder

melting point

300 °c

flash point

＞300 °c

ph change range

1.2 ( orange ) – 3.0 ( yellow )

6.5 (brown yellow ) – 8.0 ( fuchsia )

mass absorption wavelength l/ (cm.g)

λ1 (ph 1.2): 503 - 506 nm λ2 (ph 3.0): 430 - 435 nm

λ3 (ph 6.5): 430 - 435 nm λ4 (ph 8.0): 557 - 560 nm

mass absorption coefficient l/ (cm.g)

α1（λ1, ph 1.2）110-123 α2（λ2, ph 3.0）60-68

α3（λ3, ph 6.5）62-72 α4（λ4, ph 8.0）120-135

loss on drying

≤ 1.0 %

residue on ignition

≤ 0.2 %