Red sandalwood is one of the most precious woods in the world, mainly produced in the tropical areas of the Nanyang Islands, followed by Vietnam. Red sandalwood is also produced in Guangdong and Guangxi in China, but the quantity is not large. Red sandalwood is required to make furniture, and its growth period should be about 500-1000 years or longer. The red sandalwood we are currently using may grow in the Western Han Dynasty or Tang Dynasty, so red sandalwood is a very precious wood. In the Ming and Qing dynasties, the furniture in the palace was made of rosewood, but the price is rare, and the price of modern rosewood furniture is also very high. Therefore, there have been many phenomena that are substandard and substandard. Many people's interests have been threatened, so today I will introduce to you the identification method of red sandalwood furniture.
The first step is to "see"
Compared with the texture characteristics of red sandalwood, carefully observe the appearance. It is best to prepare two or three authentic red sandalwood samples with different textures. Compare and see. If you look more, you will find the feeling of identifying the red sandalwood texture.
The second step is "fight"
When you pick up a red sandalwood object, on the one hand, you can see whether it reaches the weight of red sandalwood through the beating; on the other hand, pay attention to the feel during the beating process. Generally speaking, when the number of red sandalwood objects exceeds 800, the feel will be there.
The third step is to "smell"
Scrape the stubble with a knife and smell the sawdust. "Sandalwood Sandalwood" has a slight fragrance, and if the fragrance is too strong or no fragrance is suspicious. "Lu's Black Dalbergia" has a sour fragrance and a strong smell.
The fourth step is to "bubble"
Soak the sawdust or sawdust of red sandalwood in water or white wine. At this time, the leaching solution of red sandalwood sawdust is purplish red with fluorescence on it. Red sandalwood sawdust dyes the fabric suspiciously after soaking with alcohol, and the fabric never fades.
The fifth step is to "knock"
Use authentic red sandalwood blocks, preferably "red sandalwood ruler", gently tap the red sandalwood pieces and listen to their sounds. The percussion of rosewood is crisp and sweet, and there is no murmur.
Flake Graphite is a natural crystalline Graphite . It is shaped like fish phosphorus, and is a six-square crystal system. It is layered and has good properties of high temperature resistance, conduction, heat conduction, lubrication, plasticization and acid and alkali resistance.
Flake graphite is a natural solid lubricant of layered structure, rich in resources and cheap in price.
feature
The flake graphite crystallization is complete, the film is thin and the toughness is good, the materialized performance is excellent, has the good thermal conductivity, the conductivity, the thermal shock resistance, corrosion resistance and so on.
distribution
In December 2015, geological prospectors found a large scale graphite mine in alashan, Inner Mongolia. The total amount of graphite resources was 1. 300 million tons, about 7 of the world's recoverable reserves. 3%, average grade 5. 45%. According to the introduction, such high grade, large-scale Graphite Mineral deposits are rare in China. [1]
In 2013, the U.S. geological survey reported that the global scale of graphite minerals was less than 5 million tons. The discovery was made in alashan, which has a large scale of 703 million tons of graphite in the area of zahan mushi.
classification
Classified according to the carbon content
Like C %, 99.9% High Purity Graphite; Ninety-four percent of "C %" is High Carbon Graphite; 80% "C %" is Medium Carbon Graphite; 50% "C %" is low Carbon Graphite .
Classification by size of granularity
When the particle size is smaller than w38 micropowder graphite.
standard
Scale graphite standard GB T 3518-2008
apply
refractory
Flake graphite is widely used in the treatment of gold industry of advanced refractory materials and coatings. Such as magnesia carbon brick, crucible, etc. Military industrial firework material stabilizer, smelting industrial desulfurization growth agent, light industry lead pen, electric industry carbon brush, battery industry electrode, fertilizer industry catalyst and so on. The flake graphite is deeply processed, and it can produce the graphite milk for lubricant, deformable agent, drawing agent, conductive coating and so on. It can also produce Expanded Graphite for flexible graphite products such as flexible graphite seals and flexible graphite composite products.
dope
The flake graphite as the functional filler of coating is mainly used for anticorrosive coating, fire retardant coating and conductive coating.
As an anticorrosive material, it has anti-rust primer, such as carbon black, talcum powder and oil, which has good corrosion resistance of chemicals and solvents. If you add zinc and yellow to the formula, it is better to rust.
A graphite interlayer compound obtained from Natural Graphite scales as raw materials, chemically or electrochemically treated. Expandable graphite under the condition of heat, swelling volume (up to 300 times) suffocate the flames, at the same time generate inflation, to isolate the flame, delay or interrupt the effect of flame spread, and itself does not burn, good flexibility, high surface energy, intensity of carbonized layer. But the volume and dosage of the expansive body should be suitable. The test shows that the 150um particles, 30% expansion multiples and 5% dosage are the most suitable.
The flake graphite can be directly used as a carbon conductive filler and can be made into a composite conductive filler for conductive coatings. However, due to the large addition of graphite flake, the coating can be brittle and its application is limited. Therefore, measures are taken to further improve the conductivity of graphite and effectively reduce the amount of graphite flake. Our domestic chemical machinery research institute has developed a high temperature and corrosion resistant resin as basic material, with the strong ability of conducting electrostatic entities large flake graphite flake as the main aggregates, with high intensity of ontology Good abrasion resistance.
The anti - deformation cracking - good short - cut fiber material is a solvent - free thick film conductive coating. The coating has the characteristics of anti-corrosive media penetration, small residual stress, good anti-matrix deformation, stable construction performance and long - term conductive static. Can be used in oil tank inner wall guide electrostatic coating. With electroless plating technique, according to the data of graphite powders metallized, such as copper, nickel, silver, such as the preparation of composite conductive filler, with 30% of the amount used in conductive coating, not only its conductivity is very good, and further improve corrosion.
Flake Graphite
Flake Graphite,Graphite Sheets,Natural Flake Graphite,Medium Carbon Graphite
Fengcheng Ruixing Carbon Products Co., Ltd , http://www.lnfcrxts.com