Liefermuster

Liefermuster is a sample of a product that a supplier provides to a buyer before or with the initial delivery to establish the standard of quality and specification for subsequent orders. The Liefermuster typically includes all relevant characteristics: technical specifications, dimensions, materials, finish, packaging, labeling, and performance criteria. It serves as the contractually agreed reference, allowing the buyer to assess whether the product meets the required standards and whether to approve mass production.

In practice, the Liefermuster is prepared by the supplier in accordance with the contract or specification. The buyer inspects the sample, sometimes conducting testing or certification, and signs an approval document (Abnahmeprotokoll or Prüfbericht). If approved, it becomes the benchmark for all later deliveries; if rejected, the supplier must remedy deficiencies and re-submit the Muster for approval. The process is closely linked to first article inspection (FAI) in manufacturing.

The legal effect depends on the contract: when a Liefermuster is expressly referenced, subsequent deliveries typically must conform to the Muster; non-conformities may trigger rejection, defect claims, or adjustment of price and lead times. In many procurement practices, the Liefermuster also clarifies tolerances, inspection methods and acceptance criteria.

The concept is used across industries, including mechanical engineering, electronics and textiles, and is especially prevalent in supplier qualification and production ramp-up. While the term emphasizes a delivered sample, it is distinct from a mere suggestion or prototype; it is the reference standard for ongoing supply.