Gypsum retarder

Gypsum retarder

1. Product introduction

       Appearance and shape: yellowish powder

       Odor: Microstriped fishy or odorless

       fineness: 200 mesh pass rate greater than 95%

       Stability: This retarder is compatible with hydroxypropyl methylcellulose, starch ether, latex powder, water reducing agent, etc. Construction requirements.

2. Scope of application

       Natural gypsum, desulfurized gypsum, phosphogypsum, fluorogypsum.

3. Application areas

       This retarder is suitable for gypsum products such as plastered gypsum, machine sprayed gypsum, gypsum-based self-leveling, gypsum putty, bonded gypsum, and prefabricated gypsum components.

4. The way of action of retarder on gypsum

       The setting time of building gypsum after mixing with water is mostly 6 to 18 minutes. The retarder reduces the solubility of hemihydrate gypsum, slows down the dissolution rate of hemihydrate gypsum, and the retarding ions are adsorbed on the dihydrate gypsum The surface of the crystal, and these ions are combined into the lattice to form a complex, which limits the diffusion of ions to the vicinity of the dihydrate gypsum crystals, thereby delaying the setting time of the gypsum.

5. Recommended dosage of retarder

       Tests          Gypsum-Based Products

       Detect initial clotting time        8-12 minutes

                      ;     Secondary   1-1.5‰
                      Third  ;1.5-3‰

       Note: The specific dosage of this retarder should be used before use. The test is carried out according to the gypsum varieties and auxiliary materials, and the specific dosage is subject to the experimental data.

       Preservation method: moisture-proof and moisture-proof, store in a cool and dry place, open the bag before use, it should be re-sealed and stacked should not exceed eight bags high; shelf life: storage no more than one year; packaging: 25kg/bag.