The aggregates of heavy gypsum and light gypsum are different, with heavy gypsum aggregates being sand and light gypsum being vitrified microspheres. Vitrified microspheres as lightweight filling aggregates have advantages such as insulation, fire resistance, and sound absorption. In the building materials industry, using vitrified microspheres as lightweight aggregates can improve the flowability and self resistance of mortar, reduce material shrinkage, improve product comprehensive performance, and reduce comprehensive production costs. At the same time, compared to sand, vitrified microspheres can also form certain particle strength due to surface vitrification, and have strong aging and weather resistance, as well as excellent insulation, fire prevention, and sound absorption properties. The gypsum content is different. Light plaster gypsum requires a gypsum powder content of ≥ 75%, while heavy plaster gypsum requires a gypsum powder content of ≥ 35%. Different technical performance: 1. Different density; The density of lightweight plastering gypsum is ≤ 1000kg/m3, and the density of heavy plastering gypsum is>1000kg/m3.

2、保水率（%）；轻质抹灰石膏保水率≥ 60%，重质抹灰石膏保水率≥ 75%。

2. Water retention rate (%); The water retention rate of lightweight plastering gypsum is ≥ 60%, and that of heavy plastering gypsum is ≥ 75%.

3、拉伸粘结强度；轻质抹灰石膏拉伸粘结强度≥0.3Mpa，重质抹灰石膏拉伸粘结强度≥0.4Mpa。

3. Tensile bonding strength; The tensile bonding strength of lightweight plastering gypsum is ≥ 0.3Mpa, and the tensile bonding strength of heavy plastering gypsum is ≥ 0.4Mpa.

4、抗压强度；轻质抹灰石膏抗压强度≥1.5Mpa，重质抹灰石膏抗压强度≥4.0Mpa。

4. Compressive strength; The compressive strength of lightweight plastering gypsum is ≥ 1.5Mpa, and the compressive strength of heavy plastering gypsum is ≥ 4.0Mpa.

5、抗折强度；轻质抹灰石膏抗折强度≥1.0Mpa，重质抹灰石膏抗折强度≥2.0Mpa。轻质抹灰石膏，具有容重小，施工便捷，好运输，遇水不化，成本低，保温性能优良，强度适中，能够机械喷涂等种种特点，是淘汰重质粉刷石膏后的又一升级换代产品。给开发商和施工单位带来了福音，给住户带来了更加舒适的环境。轻质抹灰石膏与市场上相比，每吨可出面积130㎡/公分，是重质粉刷石膏的3倍，大大提高了施工的效率和运输成本。

5. Bending strength; The flexural strength of lightweight plastering gypsum is ≥ 1.0Mpa, and the flexural strength of heavy plastering gypsum is ≥ 2.0Mpa. Lightweight plastering gypsum has various characteristics such as small bulk density, convenient construction, easy transportation, low cost, excellent insulation performance, moderate strength, and mechanical spraying. It is another upgraded product after the elimination of heavy plastering gypsum. Bringing good news to developers and construction units, and bringing a more comfortable environment to residents. Compared with the market, lightweight plastering gypsum can produce an area of 130 square meters per ton, which is three times that of heavy plastering gypsum, greatly improving construction efficiency and transportation costs.