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Refractory bricks JM

Refractory bricks JM

The insulation range of JM bricks is recommended for applications at temperatures of 1260 °C – 1760 °C. JM refractory bricks are made from highly pure refractory clays with a progressively higher proportion of alumina for products intended for use at higher temperatures, and carefully saturated with an organic filler which burns out during the manufacturing process to give a uniform controlled porous structure.

Features:

Superior mechanical properties with low thermal conductivity

  • Light weight and low thermal conductivity reduce heat absorption, providing significant energy savings and reduced emissions

Low iron flux and alkali content provides high refractoriness under load in service conditions

  • Available in several sizes, up to 700 mm (27½ “) long, which can be machined into special shapes or installed, reducing the need for multiple sections and connections
  • Low heat capacity
  • High level of purity
  • High hot compressive strength
  • Wide range of mortars available to provide long lasting joints with excellent performance

  •  

    JM23 JM 25 JM26 JM28 JM30 JM30HA
    Classification according to ISO 2245 10.3-10.5 140 0.8L 150 0.9L 160 1.0L
    Classification temperature °C  1260 1350 1430 1540 1650 1760
    Parameters measured at ambient conditions (23°C/50% RH)
    Density (ASTM C-134-84) kg/m3 480 770 800 890 1020 1250
    Flexural strength (ASTM C-93-84) Mpa 1 1 1,5 1,8 2 2,1
    Cold compressive strength  (ASTM C-93-84) Mpa 1,2 1,3 1,6 2,1 2,3 3,2
    Performance at high temperatures
    Continuous linear shrinkage (ASTM C-210) after 24 hours at temperatures:
    % 1230°C:

    0,2

    		 1290°C :

    0,2

    		 1400°C:  0,2 1510°C:  0,4 1570°C:  0,6 1620*°C: 0,1
    Reversible thermal linear expansion (max) 0,5 0,55 0,7 0,8 0,8
    Continuous linear shrinkage (ASTM C-16) after 90 hours at temperatures:
    1230°C 0,2 – – – – –
    1260°C at 0.069 MPa (10psi) % – – 0,2 0,1 – –
    1320°C at 0.069 MPa (10psi) % – – – 0,2 0,1 –
    1370°C at 0.069 MPa (10psi) % – – – – 0,5
    Thermal conductivity (ASTM C-182) at average temperatures:
    400°C W/m.K 0,12 0,24 0,25 0,3 0,38 0,47
    600°C W/m.K 0,14 0,25 0,27 0,32 0,39 0,48
    800°C W/m.K 0,17 0,27 0,3 0,34 0,4 0,49
    1000°C W/m.K 0,19 0,3 0,33 0,36 0,41 0,5
    1200°C W/m.K – – 0,35 0,38 0,42 0,51
    Specific heat at 1000°C kJ/kg.K 1,05 1,1 1,1 1,1
    Chemical composition (ta = trace amounts) 
    Al2O3 % 37 58 58 67,1 73,4 79,7
    SiO2 % 44,4 38 38,8 30 24,6 18
    Fe2O3 % 0,7 0,9 0,8 0,6 0,5 0,4
    TiO2 % 1,2 0,4 0,3 0,5 0,5 0,3
    CaO % 15,2 0,2 0,1 0,1 śl 0,1
    MgO+ Na2O + K2O % 1,4 1,8 1,9 1 0,9 0,7

  • Available in several sizes, up to 700 mm (27½ “) long, which can be processed into special shapes or installed, reducing the need for multiple sections and connections.