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In some cases, it has to be provided for EVERY part with its own serial number. Therefore, a CoC (whereby the blade manufacturer writes that the blades conform to specific checklists) must be provided. A defect can lead to a failure that might result in loss of life. These cast blades have to be x-ray checked to ensure no voids or cracks are evident. An airline buys fan blades for their planes’ engines. And, in some cases, specific documents are required for certification or to show the end user/customer, that the product is safe. When does a buyer ask the supplier for a CoC?Ī buyer would typically ask for a CoC on products/components that are critical or high risk. Note: we are NOT covering the case of motor vehicles in this article. The CoC can either be requested by a buyer to ensure the product being manufactured has been tested and passes the set criteria within a specification and meets both technical and safety requirements, or it would be a mandatory requirement as stated by country regulations and law for certain products, such as Bluetooth devices being sold in the USA. What Is a certificate of conformity?Ī certificate of conformity, or CoC, is issued by an authorized party (sometimes the manufacturer, sometimes an independent laboratory) and states that the product meets the required standards or specification. This article is for informative purposes only and unfortunately we will not be able to respond to queries about CoCs. Please note, we wrote the article only from the perspective of buying a batch of products from a supplier in China/Vietnam/Thailand/India and necessitating a COC. Some clients have asked us “what is a certificate of conformity” over the years, and we wrote this article to answer that question.