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  • Writer's pictureHuaao Cleanroom

What's the difference between the polystyrene panel and the rock wool panel ?

Updated: Apr 25, 2023


After more than 30 years of efforts, especially the rapid development of nearly 20 years, many products have emerged from singleness to diversity, from low to high quality, and have formed relatively complete industries of insulation products with expanded perlite, rock wool, glass wool, foam plastics, refractory fibers, calcium silicate insulation etc, as well as relatively completed technology and production equipment level.

Some products have reached the international advanced level in the 1990s. However, due to the low overall technology and equipment level of the insulation material industry in China, the application technology in the construction field needs to be improved, which has greatly affected the promotion and application of insulation materials. In recent years, the phenomenon of repeated construction of thermal insulation materials industry has been serious. Hundreds of production lines have been put into operation in various parts of the country in recent years, but little investment has been made in the development of application fields, resulting in low investment efficiency and oversupply of demand.


Rock wool sandwich panel has the most superior fire-proof performance. It has the characteristics of load-bearing, heat preservation, heat insulation, fire-proof, no need for secondary decoration, quick and convenient installation, short construction period and good comprehensive benefit. The products have passed the national quality test and the fire proof test of the national fire-proof decorative materials.

Material application:

1. Upper/lower steel plate: thickness is 0.4-0.8 mm. it can be color steel plate, galvanized steel plate and stainless steel plate.

2. Core material: rock wool, density is 120-150 kg/m3.

3. Compound PVC protective film in the form of steel plate surface protection


Thermal insulation material is a new type of building material widely used in modern industry and civil industry. In thermal insulation material industry, rock wool board is widely used, and the new polystyrene panel is also a very good thermal insulation material. What is the difference between the traditional rock wool insulation sandwich panel and the new polystyrene sandwich panel ?


1. Flame Retardant Effect

EPS boards are made of organic plastics, so they are relatively flammable. There are many fire hazards in the construction, and they are more prone to fire. B1 grade polystyrene sandwich panel can effectively solve the flammable shortcomings, but can not achieve complete non-flammability. Rock wool board is made of inorganic natural basalt, which belongs to completely non-flammable thermal insulation material. There are no fire hazards in construction, and the combustion index reaches A1 level.

2. Water Absorption Rate of Insulation Layer

Polyphenyl board and rock wool board construction technology is basically the same, can also be applied to thin plastering system, in the construction of both can use point-frame bonding method, polyphenyl board belongs to foaming plastic material, so it has a certain hydrophobic effect, water absorption rate is low, because rock wool is inorganic fiber material, so water absorption rate is higher, hydrophobic rock wool board must be used in external wall insulation application. Or use bonded mortar and plastering mortar with hydrophobic effect to form a protective layer on the surface of rock wool board, which can greatly reduce the water absorption of rock wool board.

3. Sticking and anchoring

The foam sandwich panels and the rock wool sandwich panels can all adopt the point frame bonding method, but the rock wool panel belongs to the fibrous plate, so it is not easy to be thicker when the bonding mortar is applied, but the area of the rock wool panel bonding mortar is more than the area of the polystyrene panel bonding mortar, and when necessary, the full bonding method is adopted. It is necessary to ensure that the bonding area is more than 40%. As the rock wool panel belongs to fiberboard, anchorage nails under seven layers should be no less than 7 per square and anchorage nails above seven layers should be no less than 9 per square.


After the above difference analysis, although the polystyrene sandwich board is a good organic thermal insulation material, but from the comprehensive performance analysis, it is known that the traditional rock wool thermal insulation material is relatively safe, but on the basis of the traditional material is the inevitable development of society, we believe that the performance of polystyrene thermal insulation material will be improved greatly in the future.

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