HEDP

Description

HEDP is a 60% active aqueous solution of Hydroxyethylidene-diphosphonic acid (HEDP). It provides control of calcium and other metal salts including iron and manganese by acting as a strong crystal modifying agent and threshold inhibitor. HEDP is known to be a sequestrant and excellent deposit control agent.

Applications

Cooling Water Treatment

Swimming pools

Reverse Osmosis formulation

Industrial Cleaners

Metal Finishing

Textiles

Petroleum secondary recovery

Typical Properties

Appearance

Clear to yellow

pH

<2

% Active

60

Iron (ppm as Fe)

<35

Viscosity (25°C cST)

38

Chloride %

<1

Phosphorous acid %

<4.0

Specific gravity (20°C)

1.45


Packaging and Handling

HEDP is a water-soluble acidic liquid packed in non-returnable drums. Like all aqueous solutions, HEDP may freeze if exposed to very low temperatures. It should be stored where the temperature stays above 0°C (32°F). Should the product freeze, store it in a warm area until completely thawed before using it. Keep container closed when not in use.

Toxicology/Ecological Data

Acute Oral toxicity - LD50 - rats >2000 mg/Kg

Eye - rabbit

Irritant

Skin - rabbit

Non-irritant   - rainbow trout

Other information

Not a skin sanitizer   - Daphnia

96 hour LC50

>300 mg/L

48 hour EC50

>500 mg/L

Biodegradation (Zahn-Wellens)

33% degradation in 28 days


Logistics

HEDP is supplied in polyethylene drum containing 530 pounds per drum.

 

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