protective colloid

noun Physical Chemistry.
a lyophilic colloid added to a lyophobic sol to lessen its sensitivity to the precipitating effect of an electrolyte.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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The emulsifier is adsorbed by the latex particle and acts as a protective colloid, preventing the particles from flocculating.
Gelatin is typically used as a protective colloid for suspension stability purposes.
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