BS ISO 1419:2016 pdf download – Rubber- or plastics-coated fabrics — Accelerated-ageing tests

BS ISO 1419:2016 pdf download – Rubber- or plastics-coated fabrics — Accelerated-ageing tests 4 Method A: Loss of volatiles on heating of plasticized-PVC-coated fabrics 4.1 General As a result of natural ageing, PVC-coated fabrics may lose plasticizer by volatilization, and in time this will have an adverse effect on the performance of the coating. The extent to which a particular material will be so affected will depend on the formulation of the coating, so it is desirable to assess this property. The method described is designed to accelerate the loss of volatiles by exposing test pieces to an elevated temperature, followed by determination of the loss in mass of the coating. The procedure shall be in conformance with ISO 188. 4.2 Apparatus 4.2.1 Air Oven – It shall have slow circulation of air, providing not less than three and not more than ten air changes per hour. It shall have provisions for controlling and measuring the rate of airflow and for maintaining and measuring the desired temperature and relative humidity, if necessary. There shall be provisions for suspending the test pieces vertically within the oven. During the ageing process, in order to prevent individual test pieces touching each other or the inner walls of the oven and being exposed to higher temperature, the test pieces shall not be within 10 mm of each other or within 50 mm of the inner surfaces of the oven, The incoming air shall be at the temperature specified before coming into contact with the test pieces. Any electric elements used for heating the incoming air shall be shielded to avoid direct radiation on to the test pieces. No copper or copper alloy shall be within the ageing chamber of the oven. The oven shall be of such a size that the total volume of the test pieces does not exceed 10 % of the free air space in the oven. Means shall be provided for suspending the test pieces vertically within the oven so that they are not within 10 mm of each other or within 50 mm of the inner surfaces of the oven. The temperature of the oven shall be maintained at 100°C with an accuracy of ±1 °C. 4.2.2 Thermometer, or other temperature-indicating device, for monitoring the oven temperature with an accuracy of ±1 °C. 4.2.3 Balance, capable of weighing to an accuracy of 1 mg. 4.2.4 Ruler or other length-measuring...