MDF main advantages:
1. MDF is easy to finish. All kinds of paints and paints can be evenly coated on the MDF, which is the preferred substrate for paint effects.
2. The MDF is also a beautiful decorative plate.
3, MDF various veneer, adhesive film, veneer, light metal sheet and other materials can be glued on the surface of the MDF.
4. The hard MDF board is punched and drilled, and can also be made into sound absorbing panels, which are used in the decoration engineering of buildings.
5, physical properties are excellent, the material is uniform, there is no dehydration problem.
6. The nail holding force of the MDF is good, and the nail holding force is relatively poor when the in-situ secondary nail is applied.
The main disadvantages of MDF:
1. The biggest disadvantage of the MDF is that it is not damp-proof, and it will swell when it sees water. When using density kickboards, door panels, and window sills, you should pay attention to the six sides of the paint, so that it will not be deformed.
2. The density board has a large water expansion rate and large deformation, and the load-bearing deformation is longer than that of the homogeneous solid wood particle board.
Although the moisture resistance of the MDF is poor, the screw does not loosen after being screwed, and it is easy to fix. However, the surface of the MDF is smooth and flat, the material is fine, the performance is stable, the edge is firm, and the shape is easy to avoid, causing problems such as decay and insects. It is superior to particleboard in terms of bending strength and impact strength, and the surface of the board is excellent in decoration, which is superior to the appearance of solid wood furniture.
15-25mm Calcium Carbide: Physical and chemical properties: ores are solid brown or black block, pure white crystals (including CaC2 higher purple). Density of 2.22 g / cubic centimeter, the melting point of 2300 ° C (with CaC2 content), water immediately intense reaction to generate acetylene, and release heat, Calcium Carbide content varies with the melting point also will change.
Impurities: Caustic soda often contain calcium arsenide (Ca3As2), calcium phosphide (Ca3P2) and other impurities, and the role of water at the same time release arsine (AsH3), phosphine (PH3) and other toxic gases, so the use of Acetylene generated by calcium carbide is toxic.
Crystal structure
The most common crystal form of CaC2 is tetragonal, stable between 298K and 720K. Quartet CaC2 similar to the crystal structure of NaCl, but due to [: C≡C:] 2- ion oval, oriented, the crystal is tetragonal. In CaC2 crystal, the C-C distance is 120pm, which corresponds to the bond length of carbon-carbon triple bond, the distance between Ca and C is 259 and 282pm.
15-25Mm Calcium Carbide,Acetylene Plant Calcium Carbide,Industrial Calcium Carbide,Steel Calcium Carbide
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