Pressboard : - Pressboard is a proven insulating material with a cellulose base used for insulation class A. Depending on the type of cellulose, fibre prep­aration and machine setting, various types of pressboard can be manu­factured, with very special properties. Standard types of Pressboard reels and Sheets : The structure and material properties of pressboard are defined in DIN 7733 and IEC 641. A part from the high dielectric strength and the high impregnating capacity with transformer oil (mixed dielectric oil-cellulose), it is quite remarkable that pre

Multi-Layer Insulation Materials : - Flexible multi-layer insulation materials are produced by bonding plastic films with electrical pressboard, fleece materials, fabric or plastic paper. The materials are in most cases produced with three layers, the plastic film being the middle layer. Depending on the material combi­nation, outstanding features of flexible multi-layer materials are very specific values for operating temperature, ductility, tensile strength, ex­pansion, dielectric strength, saturation capability and rigidity. Standard designs of flexible multi - layer insulati

Type K-Chromel Nickel Chromium Alloy, Alumel Nickel-Aluminium Alloy. This is the most commomly used general purpose thermocouples. They are available in the -200°C to +1200°C range. The characteristic of the thermocouple undergoes a step change when a magnetic material reaches its Curie point. This occurs for this thermocouple at 352°C. Sensitivity is 41µV/°C. Type K and N are the most oxidation resistant base metal thermocouples. Not recommended for temperature of 1200C for long period. Type J-Iron, Constantan Limited range -40 to +750°C makes type J less popular than type K. The ma

Thermostats for electrically heated appliances : - Thermostats from E.G.O. (Germany) 50 o to 300 o , 30 o to 110 o and 0 o to 85 o Bakelite and Porcelain.