Items
|
Index
|
|
Appearance
|
Clear, Colorless to pale yellow aqueous solution
|
White crystal powder
|
Active content (HEDP)%
|
60.0 min
|
90.0 min
|
Active content (HEDP·H2O)%
|
-
|
98.0 min
|
Phosphorous acid (as PO
3
3-)%
|
1.0 max
|
0.8 max
|
Phosphoric acid (as PO
4
3- )%
|
0.6 max
|
0.5 max
|
Chloride (as Cl-)%
|
0.01 max
|
0.01 max
|
pH (1% water solution)
|
2.0 max
|
2.0 max
|
Density (20ºC)g/cm3
|
1.40 min
|
-
|
Fe, mg/L
|
10.0 max
|
5.0 max
|
Colour APHA (Hazen)
|
10.0 max
|
-
|
Ca sequestration (mg CaCO3/g)
|
500.0 min
|
-
|
HEDP is used as scale and corrosion inhibition in circulating cool water system , oil field and low-pressure boilers in fields such as electric power, chemical industry, metallurgy, fertilizer, etc..
In light woven industry , HEDP is used as detergent for metal and nonmetal.
In dyeing industry , HEDP is used as peroxide stabilizer and dye-fixing agent;
In non-cyanide electroplating , HEDP is used as chelating agent.
The dosage of 1-10mg/L is preferred as scale inhibitor, 10-50mg/L as corrosion inhibitor, and 1000-2000mg/L as detergent. Usually, HEDP is used together with polycarboxylic acid.