Opal rock, which is mainly composed of devitrified glass swarf, is also called porcelain clay. Among them, the opal is composed of ultra-microscopic spheres with many pores, light texture and a small amount of clay. It is a special siliceous rock transformed from volcanic ash in lakes and seas. Tuffaceous siliceous rocks or porcelain clays often appear in strata after the Mesozoic, for example in Heilongjiang and Nenjiang.
The use of siliceous rock varies with its composition and structural characteristics. Such as white pure siliceous rock can be used as glass raw material; diatomaceous earth rich in diatom can be used as filter material or soundproof material; beautiful jasper rock with beautiful luster can be used as raw material for gemstone or carving crafts; porcelain clay can be light Raw materials for building, etc.
T-Bolt, known as hammer bolt in European standard, is made of galvanized or nickel plated carbon steel surface. T-shaped bolt can be directly put into the aluminum profile groove. During installation, it can be automatically positioned and locked. It is often used in conjunction with flange nuts. It is a standard matching connector when installing corner pieces. It can be selected according to the profile groove width and different series of profiles. T-bolts are movable foundation bolts.
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