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Test Procedures for Checking Quality of Plastic


When a polymer is chosen for any application, its various properties are considered according to the extrusion process. Rigidity, viscosity, flow rate etc. are an important consideration before incorporating any material into the application. Different industries have different requirements, while many are more concerned about toxicity level of the polymer, whereas others are more concerned about the dyeing process. Ample of tests are conducted on the raw materials to determine its properties. Not only manufacturers, raw material suppliers are also very concerned about the quality they are supplying in order to avoid rejection. 

 

 
 
 
Basic Plastic Properties to be Checked

Moisture Analysis
Granulated polymers may absorb moisture from the surrounding which may directly impact the extrusion process and develop internal strains in the end product. Moisture analysis is very important to perform so that appropriate measures can be taken. Presto’s Moisture Analysis is a smart device to check the moisture content in the granulated plastic. It consists of a halogen lamp which dries the sample and weighs the sample. Any difference in weight before and after the heating is moisture content of the sample. The instrument is equipped with a smart circuit that does all the calculations and displays the moisture content on the screen. 
 
Melt Flow Index
Melt flow index tester is a machine used to check the melt flow rate of the plastic granules. This is a very important test to understand the behaviour of polymer in the extrusion process. In this process, the granules are charged into hot barrels which results in their melting. This molten plastic comes out from the orifice which has predefined dimensions (according to testing standards). This test lasts for 10 minutes. The molten plastic that comes out in 10 minutes is weighed on the digital scale. This weight of the plastic is equivalent to MFI of the sample and it does have any units. 
 
 
Ash Content Analysis
Muffle furnace is widely used in polymer industry to determine the percentage of ash content in the sample. Ashing is done deliberately to alter the properties of the sample but in predefined quantity. Too much of ash content may result in the unwanted behaviour of the material. To determine the ash percentage, the sample is taken in the crucible bowl and heated to a point where it burnt down where carbon content starts turning into fumes and only ash is left behind. This ash is weighed. The weight of the sample before and after heating is used to derive the ash content percentage.
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