Cement, concrete or artificial stone; building blocks or bricks, whether or not reinforced

68101100 Building blocks and bricks

6810110010 Containing by weight more than 70 percent magnesia, expressed as MgO, with carbon content ranging from trace amounts to less than 30 percent, and chemically bonded by resin or pitch

6810110070 Other

68101100 Building blocks and bricks

68101101 Of silico-calcium

68101102 Of lightweight concrete (e.g. limestone concrete, gas concrete, pumice concrete)

68101109 Other

6810111000 Of light concrete (with a basis of crushed pumice, granulated slag, etc.)

6810119000 Other