Almatis Logo

Almatis :: Heat Insulating Materials
Homepage / Products & Applications / Refractories /  

Heat Insulating Materials

Heat Insulating Materials

Heat insulating materials are distinguished by low thermal conductivity and low stored heat. By the use of insulating materials the energy consumption of a furnace can be decreased and the outside wall temperature optimized. Lightweight materials with low specific heat are ideal choices for plants with periodic operating conditions to shorten the colt-to-cold cycle.

The standard heat insulating materials are classified as insulating refractory bricks, plates, insulating castables and ceramic fibre materials.

The thermal conductivity of the materials does not only depend on the total porosity but also on pore size and mineralogical composition. Innovative aggregates based on CA offer reduced thermal conductivity when compared to aggregates with comparable densities and micro-porous heat-insulating materials can have a thermal conductivity – especially at elevated temperatures- even below the conductivity of air.

Tabular & other Aggregates

Tabular Alumina T60/T64

Dense, sintered crystalline alpha alumina with 99,5% Al2O
High purity and chemical resistance

BSA 96

Dense, sintered aggregate with 96% Al2O3 and 1,2% TiO2
Replacement for Brown fused alumina

SLA 92

High-purity super lightweight aggregate,
Based on calcium hexa-aluminate CA; non-fibrous

Bonite/Bonite LD

Sintered calcium hexa-aluminate CA
High chemical resistance at reduced thermal conductivity

Cement & Binders

CA-14 M

High purity cement with 70% Al2O3; additive free
General purpose; moderate setting

CA-14 S

High purity cement with 70% Al2O3; additive free
General purpose; slow setting

CA-14 W

High purity cement with 70% Al2O3; additive free
General purpose; faster setting

CA-25 C

High purity cement with 80% Al2O3; includes additives
Extended casting life and excellent surface finish

CA-25 M

High purity cement with 80% Al2O3; includes additives
General purpose, moderate setting

Calcined Aluminas

CT 9 FG

for refractory matrix enhancement
Particle size / D50 = 5.0µm
Na2O Content = 0.15%

A2 325

Alpha-alumina for refractory matrix enhancement
Particle size / D50 = 5.5µm
Na2O Content = 0.30%

CT 800 FG

Alpha-alumina for refractory matrix enhancement
Particle size / D50 = 3.5µm
Na2O Content = 0.12%

CT 10 SG

Special alumina for gunning applications
Particle size / D50 = 3.0µm
Na2O Content = 0.4%

News & Events