The application and requirements of ISO 17025 for a Quality control laboratory is the same as any other testing laboratory. The only difference is that your client is internal, being the production facility. This means that the context is different, so the way you handle, for example your risks, opportunities and impartiality could be to a different extent. The laboratory may also, for example have a basic service level agreement with production and the reporting requirements may be simplified, on agreement with production. Depending on your sector, there could be other interested parties, such as regulators and other standards that may in fact require your quality control testing laboratory to be ISO 17025 accredited. Either way, both the laboratory and production will benefit from the efficiency provided by the management system.