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TriSodium Citrate is used as a retarder for plaster, whether used with polymer or water. Retards to about 60 minutes.
The granules should be dissolved in water in the ratio 1 part TriSodium Citrate to 10 parts clean water by weight.
This mix should be used 1%-3% by weight to plaster when using water, and 1% by weight to plaster when using Plaster Polymer.