RATH High Temperature Insulation Wool, Vacuum-Formed Shapes and Refractory Bricks

Selection and quotation of RATH refractories: Altra, Alsitra and Calsitra wool, blankets and modules, paper, vacuum-formed shapes, Filtrath elements, Porrath and Korrath bricks.

Altra, Alsitra and Calsitra High Temperature Insulation Wool

Altra is a high purity polycrystalline wool made in a sol-gel process without binders. Altra grades contain 72, 80 and 97% alumina and suit the high temperature field up to 1650 °C. Alsitra aluminum silicate wool serves processes up to 1300 °C, Calsitra alkaline earth silicate wool up to 1000 °C.

Altra polycrystalline wool up to 1650 °C
Three Altra grades: 72, 80 and 97% Al2O3
Alsitra aluminum silicate wool up to 1300 °C
Calsitra alkaline earth silicate wool up to 1000 °C

Insulation Wool Blankets and Modules for Furnace Linings

RATH blankets are needled from the wool without binders and are free of organic constituents. Standard blankets reach 50 mm in thickness, 21 m in length and densities up to 160 kg/m³. Modules are made of compressed Altra, Alsitra or Calsitra blanket strips; ALTRA 1500C comes as modules and blankets.

Blanket thickness up to 50 mm, length up to 21 m
Blanket density up to 160 kg/m³
Modules fixed on comb anchors or bonded with Kerathin
ALTRA 1500C modules for continuous use at 1400 °C

ALTRA, ALSITRA and CALSITRA High-Temperature Paper

Thin, flexible RATH paper works as thermal and electrical insulation, a separating layer or a seal. ALTRA Paper 1600 contains about 95% Al2O3 and serves up to 1600 °C, ALTRA Paper 1300 has about 75% Al2O3 for up to 1300 °C. The papers can be cut, punched and wound to the part geometry.

ALTRA Paper 1600 up to 1600 °C
ALTRA Paper 1300 up to 1300 °C
ALSITRA Paper 1400: continuous use below 1250 °C
CALSITRA Paper 1200: continuous use up to 1100 °C

Altraform, Kerform, Evac and Ultiform Vacuum-Formed Shapes

RATH vacuum-formed shapes of mineral and high temperature wools are used up to 1800 °C in neutral, oxidizing and reducing atmospheres. Altraform is made of polycrystalline wool with over 72% alumina and allows cold to cold cycles of 20 minutes. Kerform is made of aluminum silicate wool.

Altraform: alumina content over 72%
Kerform classification temperature 1000–1600 °C
Ultiform for continuous use at 1400 °C
Evac: application above 1000 °C to be checked

Filtrath Ceramic Filter Elements for Hot Gas Filtration

Filtrath elements are vacuum-formed from insulating wool: they are lightweight and their high porosity gives a low pressure drop. ASW is made of aluminum silicate wool, AES of calcium and magnesium silicate wool. Filtrath CAT elements handle DeDust, DeSOx and DeNOx in one system.

Maximum application temperature 1000 °C
Emission values below 1 mg/Nm³
Filtrath ASW: Al2O3 35–40% w/w
Filtrath AES: CaO/MgO 22–27% w/w

ALTRA FLEX Oxide Ceramic Continuous Fiber

ALTRA FLEX is the RATH oxide ceramic continuous fiber in M75, MK85 and K99 quality. The roving keeps its strength and flexibility up to 1200 °C and suits fabrics, composites, weaving and braiding. The fiber is manufactured at the RATH plant in Mönchengladbach, Germany.

Fiber quality M75, MK85 and K99
Strength and flexibility up to 1200 °C
Fabrics, composites, weaving and braiding
Made at the Mönchengladbach plant, Germany

Porrath and Ratherm Insulating Fire Bricks

RATH lightweight bricks are porous, with low thermal conductivity, and are pressed or extruded. Porrath FL23–34 covers 1200 to 1800 °C, and complex shapes are made with very small tolerances. Pressed Ratherm bricks on an aluminum silicate basis serve up to 1350 °C.

Porrath FL23–34: from 1200 to 1800 °C
Ratherm FL24, 25, 27 and FLZ 16 up to 1350 °C
Porrathin mortars and adhesives
Rathloc standardized push-fit brick system

Korrath, Durrath, Sicrath and Acrath Dense Refractory Bricks

Korrath corundum bricks with a mullite bond reach 1800 °C, while Korrath K 99 and C 99 with a corundum bond reach 1900 °C. The dense Durrath HD45 fireclay brick has an open porosity of up to 2%. SiCRATH silicon carbide bricks serve waste incineration plants, Acrath acid-resistant walls.

Korrath K 99 and C 99 up to 1900 °C
Durrath HD45: open porosity up to 2%
Alurath mullite, bauxite and spinel bricks
Acrath acid-resistant bricks, class 1 and 3

Choosing a Wool Grade by Temperature and Atmosphere

RATH wool is selected by the operating temperature and the furnace atmosphere. Calsitra alkaline earth silicate wool is used up to 1000 °C, and its suitability must be checked beforehand.

Alsitra aluminum silicate wool serves up to 1300 °C, Altra polycrystalline wool up to 1650 °C in three alumina grades. For complex parts the same wools come as Altraform, Kerform and Evac vacuum-formed shapes for neutral, oxidizing and reducing atmospheres.

Modular Wool Linings

RATH modules are made of parallel blanket strips compressed to the required thickness; the compression compensates for possible shrinkage. Altra modules are held by lateral plates, Alsitra and Calsitra modules are sewn cord modules.

They are plugged onto comb anchors or bonded with Kerathin K adhesive to brick linings or expanded metal; once the compression elements are removed, the modules expand into a closed lining. The ACS system of laminated composite moldings serves lab and industrial furnaces.

Insulating and Dense Bricks

RATH insulating fire bricks are used as a front or thermal barrier layer. Porrath FL23–34 covers 1200 to 1800 °C, Ratherm on an aluminum silicate basis serves up to 1350 °C in glass industry furnaces. Dense bricks are usually dry-pressed or extruded, small batches are compacted or poured.

The sillimanite range includes low-iron Silrath S 65 and Silrath AK 60 C with a phosphate additive against slagging.

Carath Concretes and Carathform Blocks

RATH monolithics withstand up to 1800 °C depending on the grade: Carath D dense concretes, Carath LC low-cement, Carath ULC ultra low-cement, Carath NC cement-free and Carath FL insulating concretes, Carathplast plastic mixes and Carathin mortars.

Carath ULC comes as magnesia spinel, clay spinel, spinel and corundum concretes. Carathform blocks are used where dense bricks cannot be pressed due to the complexity of the shape, and for small quantities.

RATH and model names are trademarks of their respective owners and are used only to identify the equipment for which we source parts. SpareX is not an official dealer, distributor or representative of RATH and is not affiliated with the trademark owner. Origin, documents and warranty are stated for each item in the quotation.