BS ISO 22836:2020 pdf free.Fibre-reinforced composites – Method for accelerated moisture absorption and supersaturated conditioning by moisture using sealed pressure vessel.
BS ISO 22836 1 Scope This document specifies accelerated moisture absorption properties and supersaturated conditioning by moisture for fibre-reinforced plastics) using sealed pressure vessel at higher temperature than 100 °C with saturated water vapour at used heating temperature. The purpose of this moisture absorbing procedure is to screen test specimens with moisture by mechanical or thermal properties. This document applies to carbon-fibre materials and their products with either thermoset or thermoplastic matrices, with a Tg greater than 150 °C. This document can also apply to materials reinforced with other fibres (e.g. glass-fibres) with a Tg greater than 150 °C. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 472, Plastics一Vocabulary.Place the specimens inside a sealed pressure vessel using an inner specimen support frame so that specimen surfaces do not come into contact with each other or the container, and are fully immersed in the water. Pour deionized water (10 ml to 20 ml in the case of 300 mL vessel) into the vessel. Seal and place the pressure vessel inside the oven as indicated in Figure 1. Open Valves A and B. Set the oven temperature over 100 °C such as 120 °C. At around 100 °C, release steam (water vapour) at Valve B for a short time (for example, 1 min to 2 min) to release inside air. Then close valve B. Inside water vapour pressure is confirmed by a pressure gauge at determined temperature. Continue heating for a determined period, such as 72 h.If only one vessel exists inside the oven, stop the heating and cool and vessel down to room temperature. Remove the specimens from the vessel. If one of several vessels is removed from the oven, close valve A and disconnect the connector. Take the vessel out from the oven and cool it down to room temperature. Open valve A. Remove the specimens from this vessel. A sterilizer [autoclave (5.5]] should be used instead of a sealed pressure vessel and oven for these methods. In this case, the procedure shall be followed by the operation manual of a sterilizer. BS ISO 22836 pdf download.