subject: Advantages and disadvantages of non-metallic material strap [print this page] Advantages and disadvantages of non-metallic material strap
Non-metallic materials:
1, sapphire crystal: synthesis of alumina, the hardness of the domain's 2200 ~ 2300, and its hardness second only to diamonds, to completely prevent surface wear. Sapphire crystal glass can not be on the ground or common ground? Can not, because the ground or common glass may contain diamonds or diamond powder and debris, and if it will run into the sapphire crystal scratching; the other is run into the soft material than sapphire crystal glued to the sapphire crystal, resulting in sapphire Crystal is planning to spend, this is the illusion scratching, can be polished by the master to restore. Identification of the following methods available:
drip method: a drop of water drops in the mirror on the table, drops of water diffusion indicates that the material is ordinary table mirror crystals, water droplets if the non-proliferation is the sapphire.
fingernails scraping method: nails scratching on a mirror in the table, there is a sense indicates that the block table mirror crystal material is common, if not resistance, smooth feel is the sapphire.
hardness method: Measurement table mirror material hardness and hardness contrast between the two is known. This method is most accurate, but implementation is more complex.
2, mineral crystal glass: hard, high-quality crystal glass.
4, Jade: A gem, usually nephrite (NEPHRITE) or play jade. Main origin of Peru, Alaska, United States, Myanmar. The chemical composition of nephrite amphibole family of calcium and magnesium silicate, Mohs hardness of 6.5 degrees, the proportion of 2.9-3, the color white, leaf green, dark green, Bik several; into the chemical composition of jadeite-hui Stone family of aluminum silicates, Mohs hardness of 6.5-7 degrees, the proportion of 3.3, color white, green, transparent, translucent, pearl several; on a good number of rare jade, prices are high, recent years have Swiss watch factory to the production of jade for jewelry on the table, emitting a different style of diamond jewelry oriental table.
5, Diamond: Diamond is pondering the diamond after the diamond is a natural mineral, is a diamond in the rough, but sometimes people do not add the two segments. Simply put, diamonds deep in Earth's high-pressure, high temperature by the formation of a carbon (C) elements of elemental crystals. It is the most beautiful gift of nature is one of the most expensive material wealth. To understand the value of diamonds, from the color (Colour), Clarity (Clarity), cut (Cut), Weight (Carat) four aspects of analysis, color usually white (colorless) is divided into a very white, excellent white, white , yellow (brown, gray) white, light yellow (brown, gray) white, yellow (brown, gray). Diamond clarity is not mounted level is divided into LC (IF), VVS1, VVS2, VS1, VS2, SI1, SI2, I eight grade, IF level best; has been embedded into the diamond-level excellent, good, good , well, general; diamonds color grade is divided into D, E, F, G, H, I, J, K, L, M, N, D-level best.
Advantages and disadvantages of non-metallic material strap
