| Properties |
Standards |
Definitions |
| Density |
ISO 1183 |
Weight of a volume [V], = m / V |
| Viscosity |
ISO 2555 |
Measure of the resistance to flow of a fluid under an applied force |
| Gel time |
ISO 9396 |
Time taken for a material to solidify or become extremely viscous |
| Glass transition |
ISO 11357-2 |
Approximate midpoint of the temperature range over which a material undergoes a phase temperature change from a hard, glass-like state to a rubbery state or vice versa |
| Thermal conductivity |
I SO 8894-2 |
Heat flow per unit area divided by the temperature gradient [W/mK] |
| Temperature index |
IEC 60216
UL 746B |
The temperature index (TI) is a measurement for the thermal stability. It provides the basis for classifying an insulating material into a thermal class. The TI allows different insulation materials to be compared, but only if the same end point criterion is applied (e.g. weight loss 10%, flexural strength 50%). The higher the TI, the better is the thermal behavior of the material |
| Thermal class |
IEC 60085 |
Thermal classes
Y = 90°C, A = 105°C, E = 120°C, B = 130°C, F = 155°C, H = 180°C, 200 = 200°C, 220 = 220°C |
| Shore hardness |
DIN 53805 |
Resistance against the penetration of a body of specified shape, applied under a specifie spring load |
| Tensile strength |
ISO 527 |
Maximum tensile stress sustained by a material during a tensile test (stretching) |
| Flexural strength |
ISO 178 |
Maximum flexural stress sustained by a material during a bending test |
| Elongation at break |
ISO 527 |
Tensile strain at which the material breaks |
| Modulus of elasticity |
ISO 527 |
Stress [] required to produce unit strain [], E = [/] (Young’s Modulus) |
| Water absorption |
ISO 62 |
Determination of weight after immersion compared with dry weight |
| Dielectric dissipation |
IEC 60250 |
The dielectric dissipation factor tan of a material indicates the electrical losses of the factor tan dielectric. It is the tangent of the dielectric loss angle . The dielectric loss angle of an insulating material is the angle by which the phase difference between applied voltage and resulting current deviates from 90 degrees, when the dielectric of the capacitor consists exclusively of the dielectric material. |
| Relative permittivity € |
IEC 60250 |
The relative permittvity r of an insulating material is the ratio of capacitance of a capacitor, in which the space between and around the electrodes is entirely and exclusively filled with the insulating material in question, to the capacitance of the same configuration of electrodes in vacuum. The permittivity of an insulating material is the product of its relative permittivity r and the electric constant (or permittivity of vacuum) 0. |
| Dielectric strength |
IEC 60243-1
IEC60455-2 (1998) |
The dielectric strength is the quotient of the breakdown voltage and the distance between the conducting parts between which the voltage is applied under prescribed test conditions. |
