According to EN 10204 2.2, the producing or processing factory confirms on the basis of the test results from the current operational inspections of products made of the same material and produced with the same process as the products to be supplied (series production) that the supplied products comply with the agreements made in the purchase order (see Order, Order check list.
The factory certificate is issued only if the manufacturer does not have his own inspection department which is independent of the production department. If this is the case, however, an acceptance certificate must be issued instead of the factory certificate 3.1 (former acceptance certificate 3.1B) (s. Inspection certificate).
EN 1559-1:1997, Founding – Technical conditions of delivery – Part 1: General
DIN EN 10204:2004, Metallic products - “Types of inspection documents”