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How do electrophoresis plates do?
- Depending on the separation requirement, it is determined that agarose or polyacrylamide determines the concentration according to the molecular weight of the separation molecule;Melt with water and set the comb. Add the toner (or finish the gel) to the appropriate temperatures
The difference between wood cored plywood
- Different material: wood core plate (Blockboard): the main material is the core of small pieces of wood mosaic, surface veneer and veneer; MDF: material for wood fiber and wood powder after crushing; plywood (also called splints
What's the weight of the insulating board 1000*5mm?
- 1, 500V below the distribution room, choose 5mm insulation board, power frequency withstand voltage test 3500V1 minutes, not breakdown; in power frequency voltage test 10000V, 20S shall not breakdown.2, 10KV below the distribution room, choose 8mm insulation board, power frequency withstand voltage test 10000V1 minutes, not breakdown; in power frequency compression test 18000V, 20S breakdown.3, 35KV below the distribution room, choose 10--12mm insulation board, power frequency withstand voltage test 15000V1 minutes, not breakdown; in power frequency compression test 26000V, 20S breakdown.s
Why are plywood cheaper than solid wood?
- Without changing the physical properties of wood after drying, after liposuction, a process that can be called wood paint. Plywood (Plywood: commonly known as: multilayer board) is one of the common furniture materials, is a man-made board. The plywood is logs into veneer or by wood sliced veneer, with adhesive glued into three or more layers of sheet material, usually with odd veneer, and the fiber direction of adjacent plates perpendicular to each other and gluing. Is the destruction of the physical properties of wood itself, which plays a leading role in the composition of glue, so it will not crack, but it can not be called wood, there are now a wood particle board, MDF, particleboard and other sheet rubber ingredients except outside is sawdust, sawdust, straw and other wood fiber containing something very cheap, so the production cost is very low in density so the market price is cheaper than wood.s
What is plywood?
- Plywood furniture is commonly used materials, the artificial plate can improve the utilization rate of wood, according to the use of wood is different, can be divided into, according to Liu Shan Zhang plywood plywood, poplar plywood, Eucalyptus plywood etc.. In general, plywood prices are low and are good wood substitutes. In practice, a variety of plywood due to its use of thin wood, different prices are slightly different.s
What's the difference between plywood and plywood?
- The plywood is logs into veneer or by wood sliced veneer, with adhesive glued into three or more layers of sheet material, usually with odd veneer, and the fiber direction of adjacent plates perpendicular to each other and gluing.s
Why is the bamboo plywood with all thin shades more durable?
- This with each manufacturer selection of raw materials and production process for a reason, like the south of arrows is the quality of bamboos
Is the plywood good?
- Symmetry principle: single center plane plate on both sides of the water regardless of species veneer thickness, layer, manufacturing method, fiber direction and single board rate should correspond with each other, which is symmetrical on both sides of the center plane of the corresponding layer plywood the principle of equivalent stress in different directions. Therefore, when the change of veneer moisture content, its stable structure, no deformation, cracking and other defects; on the contrary, if the symmetry center plane of corresponding layer there are some differences, will make the center plane on both sides of single board stress is not equal, the deformation and cracking of plywood.Principle of odd number layer: because the structure of plywood is adjacent layer, the fiber direction of single board is perpendicular to each other, and must accord with symmetry principle, so its total number of layers must be odd number. Such as: three laminates, five laminates, seven laminates and so on. When the odd ply plywood is bent, the maximum horizontal shear stress acts on the central veneer to make it have greater strength. Even when the plywood is bent, the maximum horizontal shear stress acts on the adhesive layer, not on the veneer. It can destroy the adhesive layer and reduce the strength of plywood.s