The test box is a test device that involves temperature control, and all need to be insulated. The use of different insulation materials in the test box is related to the price of the test box. Then the choice of insulation material is very important. Today our company will talk about the choice of insulation material.
The heat preservation method of the test box is different from the heat transfer method, and the corresponding method and material are adopted. For example, in order to prevent the minute heat transfer of hot air, a vacuum insulation layer is used. However, due to technical and cost reasons, our current environmental testing equipment uses thermal insulation materials, the most common are fiberglass thermal insulation cotton (asbestos) and foamed polyurethane, foamed styrene, etc. Now let's talk about these materials Pros and cons.
Asbestos, also known as glass wool, is the first to be widely used in thermal insulation due to its excellent thermal insulation performance and low cost. It also has the characteristics of easy operation and filling, so it is widely used in thermal conduction and thermal insulation field. However, its biggest problem is that glass fiber is easily inhaled into human lungs, and easily penetrates clothing to contact the skin, and then penetrates the skin to enter the human body. Glass fibers that enter the lungs and human body cannot be digested and excreted, and glass fibers are carcinogenic. Therefore, this year, many industries have banned the use of asbestos as a thermal insulation material.
Later, with the strengthening of environmental protection and occupational health awareness, and the maturity of polyurethane foam materials research and manufacturing, the application of foamed polyurethane is becoming more and more common, and the market share has exceeded that of asbestos, which is the inevitable development of market technology. At present, as a familiar field is the refrigerator. The evaporating tubes of the refrigerator and the thermal insulation of the boxes are all made of foamed polyurethane. Foamed polyurethane has many advantages. For example, foamed filling can be filled densely with the size and shape of the void, and its thermal conductivity is low and the thermal insulation effect is good. However, its cost is still relatively high compared to asbestos. Therefore, many manufacturers still use asbestos in order to save costs. Another major process problem is that it is difficult to remove once foamed and shaped, especially after foaming. It is very troublesome to troubleshoot the instrument, pipeline and circuit in polyurethane. This is also the reason why it has been widely used in refrigerators in other thermal insulation fields, but it is not optimistic in the environmental testing equipment industry.
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