Electrical properties (Room A.1.24 / A.1.25)

Laboratory management

Responsible employees

Specific resistance in the volume/at the surface (Room A.1.25)

• In a standardised geometry, the electrical resistance of a flat plastic sample can be determined either in the volume or on its surface. Measurements up to over 10¹⁸ Ωcm are possible. 

• Creep resistance is used to analyse the resistance of plastics to electrochemical attack. Under standardised conditions, it is tested how long a surface can withstand an electrical breakdown when constantly exposed to a salt solution. This is not a direct prediction of service life, but a comparative statement on material resistance, e.g. for outdoor use and electrotechnical applications. 

Dielectric strength (Room A.1.24)

• The dielectric strength indicates the field strength above which a plastic component can be penetrated and destroyed by a spark. 

Electrostatic chargeability (Room A.1.25)

• This method measures the electrostatic chargeability of a plastic surface by means of the time within which charges can flow off the surface. Such surface charges are often generated by friction and cause the attraction of dust and dirt, which often leads to problems in production during further processing (e.g. varnishing).  

Dielectric properties (Room A.1.25)

• Method for measuring the permittivity ε and dielectric losses in plastics as a function of temperature and frequency. Important for electronic components and applications in which alternating electric fields encounter polymer materials and either heat them up or penetrate them without loss. 

Room

• A.1.24 / A.1.25 

Devices

• Keithley Resistivity Test Fixture 8009 and Keithley Electrometer 610 C

• PTL Type KSG4
• Ceast Type 6135/013
• Kleinwächter electric field meter EFM-122 sensor
• LF decameter from WTW