TECHNICAL INFORMATION

Insulating Material

All live parts in terminal blocks are totally shrouded to minimise risk of accidental contact in High Grade Melamine or in Engineering Thermoplastic Polyamide 6.6 Housing.

High Grade Melamine

Melamine is a thermosetting material of amino group of plastics. Apart from its inherent dielectric properties, it retains mechanical, electrical and dimensional stability under conditions of heat, cold , damp and dryness to a degree in excess of commercial thermoplastic and phenolic material. It has very good insulation properties and high resistance to flash over. Its resistance to tracking is also high since it is of eroding rather than carbonising type of material. The moulded housing is non -hygroscopic, not subject to mould growth, is completely reliable in trophical conditions and can be used in temperature range of - 550C to + 1300C.

Polyamide 6.6

Engineering Thermoplastic Polyamide 6.6 has excellent electrical, mechanical and chemical characteristics, even at temperature as high as 1000 C. This insulating material has high mechanical strength - is un breakable. Its resistance to tracking is similar to Melamine. Polyamide 6.6 moulded housing absorbs humidity from its surroundings. However this is not crystallization water in the plastic itself as is the case in thermosetting plastic. H20 groups combine within the molecular structure. Thus moulded plastic housing becomes fracture proof unbreakable even in sub zero temperature conditions.

Polyamide 6.6 is difficult to ignite, self-extinguishing, burns only as long as there is a supporting flame and is rated V2 according to UL 94. It has excellent resistance to micro organisms, bacteria, enzymes and termites. Good ageing resistance and insensitivity to ultra violet light makes it suitable for trophical and open air applications. Polyamide 6.6 has excellent resistance to fuels, oils, fats and most common solvents like aliphatic and aromatic carbohydrates, ketons and alcohols.

Typical properties of insulation material