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HPMC, or Hydroxypropyl Methylcellulose, is a non-ionic cellulose ether. It is produced by modifying cellulose, a natural polymer derived from plant cell walls. The modification process involves substituting hydroxyl groups in the cellulose molecule with hydroxypropyl and methoxy groups, resulting in a product that exhibits unique properties. These properties include water solubility, thermal stability, and high viscosity, which make HPMC an essential ingredient in numerous formulations.

Contractors should ensure that they use a high-quality retarder for plaster that matches the specific needs of the project. By testing different formulations and experimenting with varying ratios, it's possible to find the ideal balance that provides enough setting time without delaying the project's progress unnecessarily.

\[ 6CO_2 + 6H_2O + \text{light energy} \rightarrow C_6H_{12}O_6 + 6O_2 \]