10 X VERMICULITE FIREBRICKS 230 X 114 X 25MM. VERMICULITE IS A NATURAL FIREPROOF INSULATION MATERIAL AND IS NOT SUITABLE FOR CONSTRUCTING OUTDOOR FIREPLACES OR OTHER STRUCTURES. THESE ARE SUITABLE FOR USE WITH THE HIGH DENSITY BRICKS TO FORM AN INSULATION LAYER TO STOP THE HEAT TRANSFERRING THROUGH TO THE OUTSIDE.
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