AAC (Light Weight Block) Products

LeichBric AAC blocks are produced to extremely narrow dimensional tolerances of +1mm. They are therefore laid by the thin-bed mortar method. The joint is 1-2mm thick, AAC Blocks for infill masonry are the logical advancement in development of the tried and proven, conventional masonry technique. Laying by the thin-bed mortar method results in a particularly high quality wall-structure with uniform thermal insulation, without heat bridges in the joints and especially with plane wall surfaces. A further considerable advantage is the fast completion of buildings with short working time.

Product Data (without Tongue & Groove)


Product Data (with Tongue & Groove)



* Specified values are from tested samples, and not guarantee of performance.


Strength Class 

There are 4 Strength Classes of AAC block products produced by LeichtBric AAC. The Product table and Properties table on this section identifies the Strength Classes available for each LeichBric AAC product.



Thermal Conductivity

The thermal conductivity w/(mk) is a specific material property. It indicates in Watts the quantity of heat which flows through one square meter of a 1m thick layer of a material when the temperature gradient in the direction of the heat flow is 1k.



Compressive Strength

LeichtBric AAC Blocks are made in various strength categories. Compared to their material strength, the blocks can withstand relatively high permissible compressive stresses, which in conventional spheres of application are quite sufficient to take building loads. Compressive Strength is tested at block samples with 6% moisture content; this characteristic is used by Engineers in the design of masonry to calculate the strength of a wall.



Moisture Content

It is the total moisture content of Block as shipped, LeichtBric AAC Blocks may contain up to 25% of residual moisture by weight as supplied.



Modulus of Elasticity

The Modulus of Elasticity (E-Modulus) is determined on prismatic test specimens taken from prefabricated components. It is calculated from the difference of longitudinal compressive strains corresponding to the increase of longitudinal compressive stress from the basic test stress Oa (approximately 5% of the declared compressive strength) to the upper test stress Ob (in general one third of the declared compressive strength).



Flexural (tensile) Strength

The Flexural strength is determined by applying a uniform bending moment in the middle third of the span of a simple supported prismatic test specimen by means of two points loading. The maximum load sustained is recorded and flexural strength is calculated.



Shear Strength

In order to achieve the proper structural design of a building to resist lateral loads utilizing shear walls, the strength and rigidity of the basic structural elements used in the shear wall construction must be accurately known. The results in a diagonal tension failure, with the specimen splitting apart in a direction parallel to the load application. The failure pattern of each specimen is noted and average shear strength, standard deviation and coefficient of variation are calculated.



Drying Shrinkage

Expected moisture content varies between 25% ex-factory and an installed equilibrium value of approximately 5% to 10%. A graph of relative length change versus moisture content is plotted, and from the curve the conventional value of Drying Shrinkage is determined as the relative length change between the two specified moisture contents 25% by mass and 6% by mass.



Water Vapor Diffusion Coefficient

Among the load-bearing mineral building materials, AAC has one of the lowest water vapor diffusion resistances. The monolithic and simultaneously heat-insulating structure of AAC elements makes additional insulating layer superfluous and avoids interlayer transitions in the element. Value of Coefficient of water vapor diffusion resistance for LeichtBric AAC material varies from 5 to 10 approximately. For example: Air=1, Concrete= 50-100.



Water Absorption

Due to closed pores of the material, the water absorption is substantially less than that of building materials with capillary action. Plaster facings are sufficient to protect the locks from the influences of the weather.



Coefficient of Thermal Expansion

The Thermal Expansion Coefficient is 8 x 10 (pow -6) / degree C which is lower than that of concrete.



Resistance to Salt Attack

LeichtBric AAC products are General Purpose Salt attach resistance Grade, and less than 2 grams mass loss in 35 cycles at AS4456 test method.



Energy Efficiency

LeichtBric AAC wall outperforms conventional concrete masonry construction fro energy efficiency (equivalent R-value). This exceptional energy efficiency is achieved by a very low thermal conductivity along with the thermal mass effect. This is a distinct benefit of the aerated concrete construction over other conventional building systems such as concrete masonry construction.



Fire Resistance

LeichtBric AAC is non-combustible. So in the case of fire, no toxic gasses or vapors are emitted. Solid AAC construction without any additional finishing materials provides a fire rating of 4 hours for a 100mm thick block wall. This exceptional rating meets even the most stringent requirements of typical building codes.
LeichtBric AAC Blocks are tested for Fire Resistance requirements of BS476: Part 22: 1987.



Sound Insulation

LeichtBric AAC, a porous concrete material, provides a sound insulation value of 7dB greater than other building materials of the same weight per surface area. AAC’s high surface mass coupled with the mechanical vibration energy damping within its porous structure produces a construction material with exceptional sound insulation properties.

Sound Damping factors (R'w) in dB inclusive of plaster coatings

* Specified values are from tested samples, and not guarantee of performance.