This is a versatile, thermal insulation and heat-resistant material produced in sheet form using good quality asbestos fibers, incombustible fillers and vegetable binders. It does not suffer loss of strength upto 485°C. When
suitably supported the board can be used satisfactorily at extreme temperatures upto approx. 1400°C.
For all kinds of thermal insulations ranging from domestic cookers and ironing boards to industrial
applications such as glass moulding, ovens and furnaces and domestic stoves. As the sheets can be bent to any diameter with a little moisture, they are most suitable for large diameter pipe cladding.
Nomex paper is an insulation paper which offers high inherent dielectric strength, mechanical toughness, flexibility and resilience. Nomex is the original form of Nomex paper, and is widely used in a majority of electrical equipment applications. Available in 11 thicknesses (0.05 to 0.76 mm) (2 to 30 mil), Nomex paper
Type 410 is used in almost every known electrical sheet insulation application.
The typical electrical property values for Nomex paper are shown in Table I. The AC Rapid Rise dielectric strength data of Table I, representing voltage stress levels, withstood 10 to 20 seconds at a frequency of 60 Hz. These values differ from long-term strength potential. DuPont recommends that continuous stresses in transformers
not exceed 1.6 kV/mm (40 V/mil) to help minimize the risk of partial discharges (corona). The full wave impulse dielectric strength data based on multiple sheets. These values are appropriate for the applications which employ these materials in such configurations. Data based on single sheets of material are available upon request.
The geometry of the system has an effect on the actual impulse strength values of the material. The dielectric strength
data are typical values and not recommended for design purposes. Design values can be supplied upon request.