Plaster Retarder

Construction Chemicals

Plaster Retarder

Plaster retarder is a modified amino acid and is used to adjust the setting time of gypsum and cement products. It will not destroy the strength of gypsum in the later stage, and it has strong adaptability and can coexist with various retarders. Modified Amino acid retarder in the retardation time with the dosage is basically a linear relationship, this feature is helpful in the use of operational control.

Super retarding effect

GR-90 can be used in various types of plaster to delay the setting time of the plaster without affecting the bond strength. GR-90 is compatible with various admixtures, such as water retention and thickening agents, dispersants, water reducers, etc.

High purity, low addition

GR-90 has extremely high purity, and a very small amount added can achieve an excellent retarding effect, effectively reducing production costs. It also has a synergistic effect with tartaric acid and anhydrous citric acid, and the combined use will have an even better effect.

Alkaline resistance

Cement is often added to plasterboard or plaster to increase its strength, but this causes the pH to rise, which affects the normal retarder. GR-95 has the characteristic of being alkali-resistant, which makes the retardant effect more stable and the quality of the plaster more consistent.

FAQ

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What is a plaster retarder?

A gypsum retarder is an additive used to slow the setting time of plaster. It gives plaster mortar a longer working time, improves work efficiency and enhances the finish. There are three common types of retarder: organic acids and their soluble salts (such as citric acid, tartaric acid, etc.), alkaline phosphates and protein retarders. These retarders are suitable for a variety of plaster materials such as natural gypsum, desulphurised gypsum and phosphogypsum, and are usually added in low amounts with good results.

What is a modified amino acid retarder?

A modified amino acid retarder is a new type of plaster retarder. Its retardation mechanism: after dissolving in water, the modified amino acid retarder forms a colloid, which adsorbs on the surface of the dihydrate gypsum to form a gelatinous film, preventing the gypsum crystals from growing further. Modified amino acid retarders can cause plaster to lose less strength, and the relationship between the retardation time and the amount of retarder added is a good linear relationship. They are gradually becoming the new favourites among plaster retarders. Modified amino acid retarders are macromolecular polymers synthesized from amino acids, and have excellent characteristics such as being environmentally friendly and safe.

Can plaster retarders be combined?

In many cases, a combination of different retarders can produce an ideal setting curve at a lower cost. The combination of two retarders can enhance their activity due to synergistic effects.

Citric acid/GR-90 mixture
Tartaric acid/GR-90 mixture

Plaster Retarder

Construction Chemicals