How many additives in Gypsum plaster？

There are a variety of additives that can be used in gypsum plaster, including accelerators, retarders, plasticizers, air-entraining agents, bonding agents, and water-repellents.

1. Accelerators: Accelerators are used to speed up the setting time of gypsum plaster. Common accelerators include calcium sulfate, calcium chloride, and sodium sulfate.

2. Retarders: Retarders are used to slow down the setting time of gypsum plaster. Common retarders include sodium silicate and cellulose ethers such as hydroxypropyl methyl cellulose,HPMC.

3. Plasticizers: Plasticizers are used to increase the workability of gypsum plaster. Common plasticizers include glycerin and polyethylene glycol.

4. Air-entraining agents: Air-entraining agents are used to improve the workability and strength of gypsum plaster. Common air-entraining agents include sodium lauryl sulfate and polyvinyl alcohol.

5. Bonding agents: Bonding agents are used to improve the adhesion of gypsum plaster to other materials. Common bonding agents include acrylic resins and polyvinyl acetate.

6. Water-repellents: Water-repellents are used to reduce the absorption of water by gypsum plaster. Common water-repellents include silicones and waxes.

The formulation of a gypsum plaster additive will depend on the specific properties and characteristics desired for the product. The formulation of a gypsum plaster additive will also depend on the type of gypsum being used, the desired application, and the desired performance characteristics. Generally, gypsum plaster additives are formulated by combining various types of gypsum, additives, and other ingredients in specific proportions.