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Plaster

Plaster plaster

Overview of plastering plaster

Gypsum is a monoclinic mineral resource contained in nature. Its main chemical component is calcium sulfate dihydrate (CaSO42H20), which is generally white, colorless or gray. Gypsum is a widely used industrial material and building material. It can be used for gypsum building products, cement retarders, model making, paint fillers, etc. The microporous structure and heating dehydration properties of gypsum and its products make it have excellent sound insulation , Heat insulation and fire resistance.

Industrial by-product gypsum is obtained from the sulfur dioxide in the flue gas treatment of industrial enterprises burning coal or oil, and has the same performance and quality standards as natural gypsum.

In recent years, due to the environmental pollution caused by the mining of natural gypsum resources, and the excessive mining in recent decades, high-quality gypsum has been exhausted; in order to protect the natural environment, many provinces in China have explicitly prohibited the mining of natural gypsum. From the policy source to guide enterprises to comprehensively utilize industrial by-product gypsum, its processing and utilization are of great significance. It not only effectively promotes the further development of the national environmental protection circular economy, but also greatly reduces the amount of natural gypsum mining and protects resources.

Desulfurized gypsum powder (CaS04.1/2H20) is an air-hardening powdery cementitious material prepared by calcination, grinding modification, aging and other processes of industrial by-product gypsum. Gypsum, cement and ash are collectively known as the three major cementitious materials. Among them, gypsum has been recognized as one of the best sustainable building cementing materials. As a new energy-saving, environmentally friendly, green and low-carbon material, it is becoming the market for modern building materials. Mainstream.



product description

Building desulfurization gypsum powder
Desulfurized gypsum powder (CaSO4:1/2H20) is an air-hardening powdery cementitious material prepared by calcination, grinding modification, and aging of industrial by-product gypsum. Gypsum, cement and lime are collectively known as the three major cementitious materials. Among them, gypsum has been recognized as one of the best sustainable building cementitious materials. As a new energy-saving, environmentally friendly, green and low-carbon material, it is becoming the market for modern building materials. Mainstream.

Desulfurization gypsum powder S3.0Index requirements
Fineness (0.2mm square hole sieve residue)≤10%
Initial setting time≥3min
Final setting time≤30min
2h flexural strength≥3.0MPa
2h compressive strength≥6.0MPa
CaSO21/2H20 content≥80%
Anhydrous CaSO content≤3%
CaSO content≤3%

Plastering plaster mortar
The high-purity gypsum powder is matched with scientific aggregates and various imported additives, which are accurately measured and strictly produced by factory. It can be used for leveling and plastering of all kinds of basic walls. It is a green product with convenient construction, no cracking, no hollowing, environmental protection, and breathing function.

product typeusage timeWater retention rateCompressive strengthFlexural strengthTensile bond strength
B≥60min≥75%≥4.0MPa≥2.0MPa≥0.4MPa
L≥60min≥60%≥2.5MPa≥1.0MPa≥0.3MPa
T≥60min≥60%≥0.6MPa---≥0.25MPa


Performance comparison

Plaster                                                                                                                                                      Cement mortar                                                                                      

advantage:                                                                                                                                                 advantage:

1. Good adhesion, suitable for a variety of substrates;                                                                                                      1. High strength          

2. Lightweight, good operability, less ash on the ground;                                                                                                 2. Good fire resistance      

2. Light weight, good operability, less ash on the ground; 3. Fast setting                                                                         Disadvantages:

 and hardening, saving construction period                                                                                                                      1. Poor adhesion, easy to produce hollow drum

4. Small shrinkage, no cracking or hollowing;                                                                                                                    2. Large shrinkage, easy to produce cracks   

5. Facilitate on-site management and reduce construction environment;                                                                         3. Lots of floor ash

6. Green environmental protection, good energy saving and                                                                                            4. Large thickness of plastering layer

emission reduction effect, adjustable indoor humidity                                                                                                      Applicable substrate:                                                             

Disadvantages:                                                                                                                                         Sintered brick masonry, cast-in-place concrete, etc.                                                                                   

1. The surface strength is not as good as cement mortar                                                                                                      

2. Not suitable for parts with waterproof and moisture-proof requirements                                                                                           

Applicable substrate:

Cast-in-place concrete, aerated concrete wall, ceiling plastering, various 

types of masonry, light-weight board wall plastering cement mortar





Comprehensive comparison

ProjectPlasterCement mortar
Environmental performance Non-toxic, harmless, low-carbon, environmentally friendly, neutral PH value, does not irritate the skinOne of the main culprits of high energy consumption, high pollution and smog, strong alkaline, irritating the skin
Main material Desulfurization gypsum powder, green building materials, circular economyCement and sand consume precious natural resources
Bonding performanceHigh bonding strength, never hollow, circular economyEmpty drums will appear repeatedly and repeatedly, which is hard to prevent
Anti-crackingNo crackingEasy to crack and sand
Construction performanceGood workability, good anti-sagging performance, less ash on the groundPoor cohesiveness, much ash on the ground, and large waste of materials
Single plastering thickness10mm or less25mm or less
Construction methodIt can be applied mechanically and single-layer spraying in place, supplemented by manual leveling and finishingTraditional manual work, plastering multiple times according to the thickness
Construction efficiency300- 320m/group (8 people)/day70- -90m/group (4 people)/person
 Material characteristicsFast hardening, no need for watering for maintenance, no putty, early access to the next process, shorten the construction periodHardening is slow, it must be watered for curing (≥7 days), and putty construction should be carried out after hardening and drying.
Material density0.8-1kg/L, and complete the same area, use less materials, reduce the weight of the building1.9kg/L, more materials per unit area, self-weight
Respiratory functionCan automatically adjust indoor humidity to improve the environmentno
Heat transfer performanceCan automatically adjust indoor humidity to improve the environmentHigh thermal conductivity (0.87w/m-k), fast heat conduction
Fire protection functionClass A1, gypsum contains about 21% crystal water, which is released when exposed to fire, effectively preventing the spread of firegeneral