Refractory insulating bricks

NR Insulating bricks  is made from alumina content ranging from 35% to 60%, it can provide low thermal conductivity, low heat storage capacity and high strength, Save heat consumption as it is designed to allow heat losses...

We offer the most extensive range of insulating bricks products in the world, and access to unparalleled expertise in thermal engineering and furnace design. Our lightweight, precision-made insulating firebricks help our customers to reduce their operating costs by saving energy.

NR Insulating bricks  is made from alumina content ranging from 35% to 60%, it can provide low thermal conductivity, low heat storage capacity and high strength, Save heat consumption as it is designed to allow heat losses, the insulating firebrick can survive temperature 900-1400 º C and then decrease weight of furnaces because of its lighter weight.

NR Series Insulating Bricks

NR series insulating bricks are a kind of highly efficient, energy saving, low-carbon,environmental protection advanced products which are manufactured according to ASTM standard. NR series products are the best lining and insulation materials in all types of industrial furnaces in the field of Metallurgy, Aluminum, Petrochemical, Ceramics, Power and Glass. They can be applied as heat insulation or no-melt erosion parts of the working layer.The products have been widely used in the following furnaces and achieved satisfactory results.

Metallurgyindustry: Blast furnace, Hot blast stove, Reheating furnace, etc.

Petrochemical industry: Ethylene cracking furnace, Hydrogen production furnace, Primary reformer furnace, Reheating furnace, etc.

Ceramics Industry: Roller kiln, Pusher kiln, etc.

Glass industry: Glass furnace regenerator, etc.

Carbon Industry: Carbon roaster, etc.

Aluminum electrolytic industry: aluminum reduction cells,etc.

Other industries: Tunnel kiln, Shuttle kiln, etc.


Low Thermal Conductivity: More porosity brings excellent insulation effect,energy saving.

High Crushing Strength:High crushing strength under thermal state, volume stability.

Low Heat Storage: Little thermal storage when absorb more heat, energy saving effect is obvious.

High Purity: Low content of iron, alkaline and metal impurities.

Accurate Dimension: Precise brick size by machining, cutting and grinding special shapes, expediting bricklaying.

Light Weight Insulating Bricks Specification :

Brick grade JM23 JM26 JM28 JM30 JM32
Classification Temperature (°C) 1260 1430 1540 1650 1760

Bulk Density (g/cm3)

0.55-0.60 0.78 0.88 1.03 1.25
Cold Crushing Strength (Mpa) 1.2 1.6 2.1 2.5 3.5
Modulus of Rupture (Mpa) 0.9 1.4 1.6 2.1 2.1
Reheating Linear Change (%)

CT-30 °CX 8H











Thermal Expansion


 0.5  0.7 0.8  0.9  1.1
Thermal conductivity(W/m.k) 400°C 0.14 0.27 0.32 0.41 0.49
600°C 0.16 0.29 0.34 0.43 0.5
800°C 0.18 0.31 0.36 0.44 0.51
1000°C 0.20 0.33 0.38 0.45 0.53
Al2O3 (%) 37 58 67 73 77
Fe2O3 (%) 1.0 1.0 1.0 0.5 0.4


All our insulating firebricks are made from high-purity refractory clays with graduated additions of alumina for the higher temperature-rated products. Carefully graded organic fillers burn out during firing to give a uniform, controlled pore structure with:

  • Excellent strength at ambient and elevated temperatures
  • Outstanding insulating values across the temperature range
  • Lower heat storage than denser refractories
  • Very low levels of iron and other impurities
  • Low reheat shrinkage

Our insulating firebrick products are suitable for use in hot face refractory linings or as back-up insulation in all types of high temperature processing of metals, petrochemicals and ceramics including:

  • Primary processing furnaces for fabrication and forging of ferrous metals
  • Roller hearth, Reheating and Forging furnaces for ferrous and non-ferrous metals
  • Blast furnaces and host blast stoves for carbon bake ovens
  • Flues, refining vessels and reactor chambers used in petrochemical processing
  • Ceramic kilns used by manufacturers of sanitary ware, glass ware and building products
  • Hobby and Laboratory kilns
  • Rotary lime kilns
  • Fireplaces

We have the expertise to advise on the optimum insulating firebrick products for your application, and we also offer furnace design services. Contact us to learn more about how we can help improve your high temperature process and save energy.

Find more refractory bricks here for your furnaces