The advantage of the plastic centrifuge tube is that it is transparent or translucent, its hardness is small, and the gradient can be taken out by the puncture method. The disadvantage is that it is easy to deform, has poor corrosion resistance to organic solvents, and has a short service life.
Plastic Centrifuge Tubes have caps, which are used to prevent sample leakage, especially when used for radioactive or highly corrosive samples. It is very important to prevent sample leakage; the tube cap also has a function to prevent sample volatilization. And support the centrifuge tube to prevent deformation of the centrifuge tube. When choosing this point, you should also pay attention to check whether the tube cover is tight, and whether it can be tightly covered during the test, so as to achieve the inversion without leakage;
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Stone into the industry with the largest foreign exchange earning in China's building materials
China is the world's largest stone producing country and exporting country. As the industry that has earned the most foreign trade in building materials for many years, in 2008, China's stone is still not afraid of dangers, standing tall and heading against the wind, and the total trade volume still has a larger growth than the previous year. Data show that in 2008 China's stone import and export trade totaled nearly 5.5 billion US dollars, an increase of 17.14% over the previous year. Of this total, exports were 3.943 billion US dollars, an increase of 15.06% over the previous year; imports were 1.545 billion US dollars, an increase of 22.72% over the previous year. It can be seen that China's stone industry, which is higher than the average growth rate of imports and exports in many industries, shows vigorous vitality and hope of anger. But behind the numbers, we also warned us that the export of stone may have a “single digit†increase in benefits for the first time. The import structure has also undergone significant changes. Foreign exchange expenditure has increased significantly. The domestic marble deep processing momentum has slowed down, and the industry has developed adjustment information. It is understood that in 2008 China's stone exports reached 28.33 million tons, and the total trade volume reached 3.943 billion US dollars, an increase of 2.57% and 15.10% respectively over the previous year. The import of stone was 8.19 million tons, which was 1.545 billion US dollars, up 13.28% and 22.72% respectively over the previous year. The total import and export volume was 36.52 million tons, totaling 5.48 billion US dollars, which also increased by 4.82% and 17.14% respectively over the previous year. . It is not difficult to find out that in the context of the international “financial ice ageâ€, any industry will inevitably encounter severe cold, especially the impact of exchange rates in trade. For the stone industry, it means that in the past year, the same amount of products were exported, and about 11% of foreign exchange was obtained. (The RMB has appreciated by about 11% in one year, and has increased by about 20% since 2005. ). In turn, the exchange of foreign exchange for domestic renminbi is also relatively reduced, making the domestic benefits of enterprises further low. If exporting from the whole industry, using the 15.06% of the export value growth data in 2008 to offset the 11% loss due to exchange rate changes, stone exports for the first time highlight the 4% "single digit" growth of benefits - - In a word, the export of the US dollar is much more, but the exchange for the domestic consumption of the renminbi will soon be reduced or reduced, and the economic benefits of the enterprise using the renminbi are actually not ideal. This is also the most direct reason for the country's recent rapid recovery of export tax rebates. Imported data showed that the use of foreign exchange was 1.545 billion US dollars, a net increase of 287 million US dollars over the previous year. The large-scale use of foreign exchange was mainly used on imported marble plates. This was due to exchange rate changes and imports of marble plates in US dollars. It is more cost-effective to process than imported marble blocks. However, to a certain extent, this is one of the reasons for the lack of construction of domestic marble sheet production plants and the suspension of production by departmental enterprises.