How to distinguish shale brick from red brick?

Different raw materials, different properties and so on.

1, shale brick is made by processing shale into powder and then pressing it. The raw material of shale brick is shale, without clay, and the color is usually gray, black or brown, while red brick is mainly made of clay, which comes from soil and contains some iron. The color of red brick is red, because iron is oxidized into ferric oxide during firing.

2. Shale brick has high strength, good compressive performance, excellent thermal insulation and sound insulation performance, and good environmental protection performance, because the raw materials are non-cultivated resources, which is beneficial to saving land resources, while red brick has high strength, good compressive performance and relatively low price, but red brick has poor thermal insulation and sound insulation performance.