Ceramic Fiber Products

BULK FIBRE / CERABLANKETS / CERACHEM BLANKETS / SABER BLOCKS / PYROFOLD / Z-BLOCK MODULES / VENEERING MODULES / MOIST FELT / BOARDS & SHAPES / TEXTILES / PAPER / VENEERING CEMENT / MASTIC

Ceramic Fibre Products

Ceramic fibre is an asbestos free blown or spun alumino-silicate fibre made from blends of high purity alumina, and silica. A unique combination of physical and refractory properties makes this an outstanding material for use in high temperature applications. The basic fibre, which is white and non-crystalline, can be converted into a wide range of product forms to suit many different applications throughout the broad spectrum of industry particularly where hot processes are involved.

Classification Temperature

Standard/Cerafiber - 1260/C

Zirconia/Cerachem fiber - 1425/C

CERAMIC FIBER	Ceragrade	Cerachem grade
Classification temp.	1260°C	1425°C
Continuous Maximum operating temp.	1175°C	1325°C
Fibre Diameter (Arithmetic mean)	3 - 4 microns	3 - 4 microns
Specific Heat Capacity KJ/KgK at 1090°C	1.13	1.13
Tensile Strength (Kpa) (for 128 Kg/m³ Blanket)	60 min.	60 min.
Linear shrinkage (% after 24 hrs firing)	3% max at 1200°C	3.5% max at 1200°C
Leachable Chloride content	< 10 ppm	< 10 ppm

CERAMIC FIBER	Standard fibre	Zirconia fibre
Classification temp.	1260°C	1260°C
Continuous Maximum operating temp.	1175°C	1325°C
Fibre Diameter (Arithmetic mean)	1.5 - 3.0 microns	1.5 - 3.0 microns
Specific Heat Capacity KJ/KgK at 1090°C	1.07	1.07
Tensile Strength (Kpa) (for 128 Kg/m³ Blanket)	30 - 60	30 - 60
Linear shrinkage (% after 24 hrs firing)	less than 3.2 at 1200°C	less than 3.5 at 1200°C
Leachable Chloride content	< 10 ppm	< 10 ppm

Key Properties

Key Properties of all Cerafiber, Cerablankets and Ceramic Fibre products are

Very low thermal conductivity - about one third that of insulating refractory bricks, meaning thin but effective insulation.
Extremely low heat storage due to low density. In furnace applications this means faster heat up and cool down times, hence higher productivity and fuel savings.
Light weight - one sixth the weight of insulating bricks. Fumace steel structure is hence much lighter, and costs less.
Easy to install and maintain, saves time.
Resistant to thermal shock. No matter how fast they are heated or cooled, the product forms
will not crack or spall.

Good acoustic properties enable Ceramic Fibre Products to be used for noise reduction in high temperature enviorments. An attendant benefit is vibration reduction.

Ceramic Fibre is chemically pure, and has very low chloride content. Special handling techniques can be employed to further limit leachable chloride levels to less than 10 ppm, for use in contact with stainless steel in special applications.

Ceramic Fibre are compietely inorganic and binder free. Bulk fiber, blanket and moist felt, are therefore incombustable. Vacuum formed products contain a small quantity of temporary inorganic binder which burns off in service.

Ceramic Fibre products are resistant to chemical attack except by hydroflouric and phosphoric acids and strong alkalies. The high chemical purity of Ceramic Fibre products allows them to be used for controlled chloride content applications such as in fertilizer plants. Against Grades special orders, ARORA REFRACTORIES can supply blankets with less than 5 ppm chloride levels.

Chemical Analysis - CERAMIC FIBRE PRODUCTS

Chemical Component	Cerafiber
Al₂O₃	44-48%
SiO₂	52-56%
Others	Traces

Chemical Component	Cerachem
Al₂O₃	33-37%
SiO₂	48-52%
ZrO₂	13-17%
Others	Traces

Data derived from average results of tests conducted under standard procedures subject to variation, and should not be used for specification purposes.

Thermal Conductivity

The graphical data shown in this leaflet is derirved from tests based on ASTM C201 method, which is the recommended test method for fibrous products by the European Federation of manufacturers of refractory products. Non-Air atmospheres can exert a marked influence on the effective conductivity. We therefore recommend that the use of Ceramic Fibre in special atmospheres is discussed with our sales /application engineers. An interesting feature is the trend of decreasing conductivity with increasing fibre density for the same grade of ceramic fibre. This holds up to a density of about 300 kg/m3, remaining constant to around 400 kg/m3. The explanation lies in the fact that measured values are total conductivities representing the combined heat transfer from radiation, convection, and conduction (of fibre and air) through the highly porous material. The relative importance of individual modes varies both with temperature and fibre density.

Continuous Service Ratings

The normal continuous service temperatures are approximately 100/C below classification temperature in air or oxidising atmospheres and apprnximately 200/C lower in highly reducing atmospheres. However, the upper temperature limit depends on requirements of specific applications. Practical experience is likely to provide the final recommendation. The figures quoted as continuous service temperatures are given as a guide, taking into account likely changes in properties such as resiliency and shrinkage, resulting from devitrification on the individual fibres.

Our sales/application engineers will be glad to advise in specific

cases.

Ceramic fibre is an asbestos free blown or spun alumino-silicate fibre made from blends of high purity alumina and silica. A unique combination of physical and refractory properties makes this an outstanding material for use in high temperature applications. The basic fibre, which is white and non-crystalline, can be converted into a wide range of product forms to suit many different applications throughout the broad spectrum of industry particularly where hot processes are involved.

What ARORA REFRACTORIES Can Offer You

Energy savings solutions for your specific thermal management problems.
A range of options in ceramic fibre insulation product forms, dimensions, and properties.
Custom built modules and vacuum formed shapes.
A range of accessories - Metallic anchors, ceramic cup locks, mastics, and cements, to provide a total product package for your furnace linings. Advisory service on anchors selection.
Passive fire protection systems for ducts, cables, steel structures, marine applications, and building.
Heat transfer calculations and lining designs to provide cost effective furnace lining.
Application engineering services to customize products to your needs.
Product application support and installation supervision, to ensure quality in furnace lining.