Standards stipulate the determination of the carbon black content of polyolefins and/or also the residue on ignition of carbon blacks. The method is based on the pyrolysis of the plastic in an inert gas stream (nitrogen), i.e. the remaining quantity is burned again at the same temperature with air supply and the carbon black content is determined by differential weighing.
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The tester consists of a tube furnace with prefabricated and replica glassware and silicone hoses through which the nitrogen and compressed air are supplied and the discharged combustion gases are conducted. The prefabricated glassware is used for cleaning and subsequent drying of the nitrogen, provided it contains an oxygen content greater than 0.002. The required flow rate can be manually adjusted using a flow meter.
A digital temperature controller regulates the temperature of the tube furnace. It is adjusted by hand. The furnace is equipped with a safety shutdown that is activated at a temperature of 1100°C.
A diode on the front panel indicates the shut-down. The temperature of the samples in the furnace is measured with a nickel-chromium-nickel temperature sensor and displayed on a digital thermometer.
All components of the test device are securely mounted on a frame. The delivery contents also include two shuttles each made of quartz glass and porcelain, crucible tongs for loading the furnace and a desiccator.
The analytical balance is required in every test laboratory. It is used to precisely determine important values such as MFR, carbon black content, K-value, degree of crosslinking, OIT, volatile components, water absorption and similar.
