Low temperature insulation
Low temperature insulation is used to prevent heat transfer from a colder environment to a warmer one. It is commonly employed in applications where the enclosure is at a temperature lower than the ambient temperature, such as in cryogenic storage tanks, refrigeration systems, and cold storage facilities. The purpose of low temperature insulation is to minimize heat loss and maintain the desired temperature inside the enclosure.

Options for low temperature insulation
Let's analyze each of the given options to determine which one is not a low temperature insulation.

a) Asbestos
Asbestos is a naturally occurring mineral fiber that has been widely used as insulation material in the past due to its excellent thermal properties. However, it is now recognized as a health hazard due to its association with various respiratory diseases, including lung cancer and mesothelioma. As a result, the use of asbestos insulation has been banned or heavily restricted in many countries. Therefore, asbestos is not a suitable choice for low temperature insulation due to its health risks.

b) Cork
Cork is a natural material derived from the bark of the cork oak tree. It is known for its low thermal conductivity and excellent insulation properties. Cork insulation is commonly used in various applications, including low temperature environments, as it can effectively reduce heat transfer. Therefore, cork is a suitable option for low temperature insulation.

c) Cattle hair
Cattle hair is not commonly used as an insulation material due to its limited thermal properties. While it may provide some degree of insulation, it is not as effective as other materials specifically designed for low temperature applications. Therefore, cattle hair is not a preferred choice for low temperature insulation.

d) Slag wool
Slag wool, also known as mineral wool or rock wool, is a type of insulation material made from molten slag or rock that is spun into fibers. It is widely used for both high and low temperature insulation applications due to its excellent thermal and acoustic properties. Slag wool insulation is commonly used in industrial settings, including low temperature environments, to minimize heat loss. Therefore, slag wool is a suitable option for low temperature insulation.

Conclusion
Among the given options, asbestos is not a suitable choice for low temperature insulation due to its health risks. Cork, cattle hair, and slag wool are all viable options for low temperature insulation, with each having its own advantages and limitations.