A1 Determining Classification: The Applied Materials design engineer shall specify on drawings the Class of each weldment. Class I weldments shall have special restriction in cleaning and cleanroom requirements. Selection of class shall be made in accordance with the following two questions.A1.1 Does the weldment possess chemical and/or water sensitive components such as thermocouples and heaters?A1.2 Does the weldment have adjacent joints with crevices that could trap chemicals during a post-weld wet-cleaning process, and due to design restrictions cannot be flushed with DI water and subsequently baked-out? If the answer to either of the questions above is “yes”, then the weldment is Class I.If the answer to both questions above is “no”, then the weldment is Class II.