When it comes to high-temperature insulation, there are several materials that can be used to ensure your equipment operates safely and efficiently.
Which insulation material is used for high temperature? (6 Options Explained)
1. Fiberglass Cloth
Fiberglass cloth is commonly used as a hot side cover and insulation material. It can withstand temperatures ranging from 600°F to 1000°F.
2. Silica Cloth
Silica cloth is another option for hot side covers. It can handle even higher temperatures, ranging from 1501°F to 1800°F.
3. Teflon Sheet
Teflon sheet is used as a cold side cover. It provides insulation and has a high resistance to temperature.
4. Vermiculite Fiberglass
Vermiculite fiberglass is also used as a cold side cover. It offers thermal insulation and can withstand high temperatures.
5. Ceramic
Ceramic is used as hot side insulation material in hybrid hot zones. It can be introduced as fibers, making it an effective insulating material.
6. Graphite
Graphite is used as insulation material in hot zones. It has excellent thermal insulation properties and high thermal stability. It can be manufactured from rigid graphite fiber board or graphite felt. The thickness of the insulation varies based on the desired operating temperatures and hot zone size.
Selecting the right insulation material is crucial. You should consider the service temperature range, compatibility with raw materials, and combustibility. The thickness of the insulation should also be chosen based on availability from suppliers. Protecting the insulation is essential for its longevity. Firebrick clay is recommended as the outermost layer of insulation for added protection.
In vacuum-furnace insulation, molybdenum and graphite are commonly used. In all-metal hot zones, multiple layers of sheet metal with gaps between each layer are used as heat shielding. Molybdenum sheets backed by stainless steel sheets are often used for standard furnaces. For higher operating temperatures, the number and thickness of molybdenum layers are increased. Tantalum sheet can be used for very high temperatures. The gaps between the layers of sheet metal prevent heat from being conducted outward. The reflectivity of the inner molybdenum sheet helps direct radiant heat inward. All-metal hot zones are preferred in high-vacuum or clean processing environments. However, they require careful operation due to the embrittlement of molybdenum at high temperatures and their relatively higher cost compared to other options.
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