Laboratory Products
Straight Forward Water Determination in Various Plastics
Apr 13 2010
The presence of excessive water in plastics adversely affects the performance of polymeric goods. This is why water determination is of crucial importance. Metrohm describes the straightforward and accurate determination of the water content using the Karl Fischer Oven Method in ten different plastic types.
The plastic sample being tested is heated in a hermetically sealed vial. The moisture liberated from the sample is transferred via a dry carrier gas stream into the titration cell where it is coulometrically titrated. For every
plastic type, the optimum oven temperature can be determined in a water release curve. This procedure ensures fast and quantitative water extraction in a reasonable time while – very important – excluding interfering decomposition reactions.
Thermally stable polycarbonates, fibre-reinforced polyesters and acrylonitrile-butadienestyrene (ABS) resins need to be heated to 230ºC to extract water. Thermally less stable resins such as polyamides and PVC need only to be heated to 150 and 100ºC, respectively. The water content in the following plastics was determined: Terluran® GP-22 Natural; Grilamid® TR 55 Natural;Ultramid® A3K Natural; Ultramid® A3K Black; Ultramid A 3H-G5 Black; Grivory HTV-3H1 Natural; Makrolon® 1243 (colour code 550111); PET regrind (recycled); PET regrind (new); PVC.
Digital Edition
Lab Asia 31.4 August 2024
August 2024
Chromatography Articles - HPLC gradient validation using non-invasive flowmeters Mass Spectrometry & Spectroscopy Articles - MS detection of Alzheimer’s blood-based biomarkers Labo...
View all digital editions
Events
Sep 04 2024 Chiba, Tokyo, Japan
Sep 04 2024 University of Warwick, Coventry, UK
Sep 11 2024 Bangkok, Thailand
Sep 11 2024 Singapore
Sep 11 2024 Bangkok, Thailand