The EN ISO 23936 series describes general principles and gives requirements and recommendations for the selection and qualification of non-metallic materials for service in equipment used in oil and gas production environments, where the failure of such equipment could pose a risk to the health and safety of the public and personnel or to the environment. It can be applied to help to avoid costly corrosion failures of the equipment itself. It supplements, but does not replace, the material requirements given in the appropriate design codes, standards or regulations. This part of EN ISO 23936 addresses the resistance of thermoplastics to the deterioration in properties that may be caused by physical or chemical interaction with produced and injected oil and gasfield media and with production and treatment chemical. Interaction with sunlight is included, however, ionising radiation is excluded from the scope of this part of EN ISO 23936. The requirements of the EN ISO 13628 series shall take precedence in subsea applications. The requirements of the EN 1555 series, the EN 12201 series, or national equivalents shall take precedence in polyethylene pipe applications. The requirements of ISO 10423 shall take precedence for wellhead applications and ISO 14313 for valve applications. Furthermore, this part of EN ISO 23936 is not necessarily suitable for application to equipment used in refining or downstream processes and equipment.