Chemical Name: 1-Hydroxyethylidene-1,1-Diphosphonic Acid
Abbreviation: HEDP LAs
Molecular Formula: C2H8O7P2
Molecular Weight: 206
CAS Number: 2809-21-4
Application Notes: Noted for its excellent CaCO3 scale inhibition and chlorine stability.
Recommended Uses: Cooling water treatment, boiler treatment, I & I cleaners, swimming pool stain prevention, metal ion control.
Typical Properties:
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Appearance
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Clear, Colorless to pale yellow aqueous solution
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Odour
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Slight to none
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Assay (%w/w HEDP)
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58.0 – 62.0
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pH at 20°C (1% w/v)
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2.0 max
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Sequestrant value (CaCO3) mg/g
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400 min
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Iron content (Fe ppm)
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10.0 max
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Phosphorous acid as H3PO33+ phosphoric acid as H3PO44+ (%w/w)
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4.0 max
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Orthophosphate as PO4 (%w/w)
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0.5 max
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Specific Gravity at 20/20°C
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1.440 - 1.455
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Chloride as Cl ppm
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100.0 max
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Colour (APHA)
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30 max
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Arsenic content (As ppm)
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1.0 max
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