Properties
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Properties

 

Light Weight
Thermal Conductivity
Fire Resistance
Strength
Colour, Texture
Workability
Moisture Content
Water Vapour Permeability
Thermal Expansion
Specific Heat
Melting Point
Sound Transmission
Chemical Properties
Solubility in Water

Light Weight: Go to Top
The standard nominal dry density for all Siporex products is 550 kg per cubic meter. Blocks of nominal dry density 450 kg per cubic meter can also be manufactured. This light weight property will give the following savings :
- Size of foundation and other concrete elements of the building , if any , will be reduced .
- Foundation depth, excavation and backfill will be reduced.
- Number of trailers required to transport siporex materials is much less than those required to transport ordinary precast panels.
- Erection work can be carried out without the use of heavy equipment.

Thermal Conductivity: Go to Top

The thermal conductivity ( k ) for completely dry Siporex is 0.144 W/m deg C. This is reflected in considerable saving of electricity consumption and improving indoor confort. Other savings are also achieved by using Siporex Blocks when replacing a 30 - 35 cm thick sandwich wall by a single 20 cm thick Siporex wall . This can reduce the size of R.C. beams, columns and foundations and will give more living space. The most economical use of Siporex for normal two or three storey structures is to use the structural wall, floor and roof panels and slabs.

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Fire Resistance: Go to Top
Siporex is an inorganic material and therefore incombustible . It provides a fire resistance value which meets American, British and German codes. As an example, 15 cm thick siporex wall has a fire resistability of seven (7) hours in accordance with ASTM standards. It is ideal for fire walls and also for fire protection of structural steel.

Strength: Go to Top
In relation to its weight, Siporex has a high compressive strength. Following are the strength constants for Siporex material :
Compressive Strength = 35 kg/cm2
Tensile Strength = 6 kg / cm2
Modulus of elasticity = 16000 kg/cm2
Shear Strength = 2 kg/ cm2

Colour, Texture: Go to Top
Siporex is greyish white. The surface is even. At the wire cut surface, the macro pores are invisible. Milling of the jointing surfaces after the steam curing, makes the pores visible.

Workability: Go to Top
Siporex can be worked like wood . One can saw, nail and drill in Siporex. There are several suitable Sipurex tools available for this purpose. When nailing in Siporex special types of nails should be used, which give a good anchorag.

Moisture Content: Go to Top
Siporex products have a moisture content of 25 - 40 % of its weight when the material is delivered. As with all concrete products Siporex will dry out until it reaches equilibrium with the moisture content of surrounding air. In this state it will reach a moisture content of 2 % - 6 % within one year from erection.
As with all other concrete finishes slabs and walls should receive protection against water penetration, for external walls this can be a single coat decorative coating.

Water Vapour Permeability: Go to Top
The diffusion coefficient for Siporex is approximately 0.15 * 10-3 g/m.h. Pa { 0.02 g/m.h. mm Hg.)

Thermal Expansion: Go to Top
The coefficient of linear expansion is 8 x 10-6 per deg. C, which is rather lower than that of dense concrete.

Specific Heat: Go to Top
At the normal equilibrium moisture content, the specific heat is 1.0 - 1.1 kJ/ kg deg. C ( 0. 24 - 0.26 kcal/ kg deg. C. )

Melting Point: Go to Top
Siporex starts to sinter at about 1.000 deg. C and melts at 1,100- 1,200 deg. C. Certain physical transformations occur, at lower temperature, therefore, Siporex is not suitable for use in constructions which are going to be exposed to high temperature, e.g. kilns, stoves, chimneys etc.

Sound Transmission: Go to Top
Sound insulation is the principle method of controlling both airborne and impact sound in buildings and is normally expressed in terms of sound reduction. Sound reduction is defined as the ratio of sound energy at its source to that at any other location and is expressed as decibels ( dB ). It is important to note that the scale of decibels is logarithmic-an increase of 10 dB means a reduction of sound to one tenth, 20 dB a reduction to one hundredth etc. The sound reduction factor provides a means of assessing the relative efficiency of different materials and forms of construction as sound insulators.

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In many European countries the sound reduction factor is described as SRI -Sound Reduction Index. In America, the term used is STC - Sound Transmission Class. Siporex meets the appropriate standards for sound insulation in house buildings, and helps to protect against production noise in industrial constructions.

Chemical Properties: Go to Top
Like ordinary concrete, Siporex is alkaline and does not chemically attack other building materials. Due to the porosity of Siporex all metal fixings into Siporex should be of non corrosive materials or protected against corrosion. Suitable fixings are available for use with aerated concrete from all the major fixings suppliers.

Solubility in Water: Go to Top
The vital components in Siporex are water insoluble . However, like most building materials, Siporcx contains small amounts of water soluble salts, which have no influence on the strength and resistance . Under severe conditions, they can appear on the surface as efflorescence. The fomation of efflorescence is mainly a matter of repeated wetting in combination with very bad drying conditions . Under normal drying conditions, it hardly ever occurs.

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