The maximum temperature of the high and low temperature test chamber is 180 degrees, and the low temperature can reach minus 80 or even lower. We all know that its constant temperature is guaranteed by the heat insulation layer between the outer shell and the inner tank. There are many kinds of materials, but the most widely used in our industry are two types: asbestos (also known as ultra-fine glass fiber cotton) and polyurethane rigid foam. Below, Shanghai Linpin Instrument Co., Ltd. will look at these two for you. Material performance characteristics:
Asbestos, also known as "ultra-fine glass fiber wool": It is a general term for natural fibrous silicate minerals, under the jurisdiction of 2 categories, a total of 6 minerals (serpentine asbestos, hornblende asbestos, Yang (Asbestos asbestos, asbestos asbestos, iron asbestos, tremolite asbestos, etc.), asbestos is composed of fiber bundles, and the fiber bundles are composed of very long and thin fibers that can be separated from each other. Asbestos has a high degree of fire resistance, electrical insulation and heat insulation, and is an important fireproof, insulating and thermal insulation material. Asbestos needs to be manually plugged into the box a little during the production process. The work is more cumbersome, but it is suitable for high and low temperature ranges Wider, it is the most used material in the insulation layer of the test chamber.
Rigid polyurethane foam: Foam polyurethane is composed of two components, the first component is polyol, the second component is isocyanate, the two components are mixed into the spraying machine and sprayed out during the construction, it is in the form of mist, foaming and solidifying in one minute forming. This material has only been introduced in recent years. It has been used for building insulation and waterproofing for two or three years. It has more understanding, many advantages, and a wide range of applications. The insulation layer of this high and low temperature test box can be passed through a foaming machine Direct injection molding is more convenient in the production process, but it is worth noting that although the rigid polyurethane foam has good thermal insulation performance, it is not subject to high temperatures. For example, when the temperature in the box is higher than 80 degrees, the development of the thermal insulation layer Bubbles will bubble, causing the box to deform. Foaming is mostly used in large walk-in constant temperature laboratories.
Detailed explanation of high and low temperature test box insulation cotton material
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