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DARVAN® 821A
Ammonium Polyacrylate for Ceramic Bodies
DARVAN 821A, an ammonium polyacrylate, is used mainly in the electronic and specialty ceramics fields where low soda content is required
Component CAS# Percentage
Water 7732-18-5 60%
Ammonium polyacrylate 9003-03-6 40%
PHYSICAL PROPERTIES:
Molecular Weight: 3500
Appearance: Light Yellow Fluid
Density at 25°C: 1.25 Mg/m3
Weight per gallon: 9.8 lb
Percent solids: 40.0 ± 1.0%
Percent ash: 0.01% maximum – on wet weight
pH: 7.0 to 8.0 @25oC
Viscosity at 25°C: 50 cps
Solubility: Very soluble in water systems.
STABILITY: Stable in the presence of acids and alkalies over a wide pH range.
STORAGE: Store above -10°C (50oF). Partial freezing does not affect the product’s dispersing properties. Shelf Life is 2 years.
APPLICATIONS: Darvan 821-A and C-N are ammonium types for electronic and specialty ceramic products. They have low ash content and work well when prolonged ball milling or shear mixing are necessary.
DARVAN 821A: is recommended for use in the electronic and specialty fields where low soda content is required.
The active agent in Darvan is polyacrylic acid. Its molecules are negatively charged along their length. They attach to clay particles and cause them to repel each other.