# Surface-adhesion quality requirements — document YS-14

**Edition:** 4
**Effective from:** 1 September 2024

## 3.2 Adhesion requirement

The surface shall meet adhesion class B according to the internal scale. Testing is performed according to method M-221.

## 3.3 Pre-treatment

The surface pre-treatment shall follow five defined settings, internally numbered **P15–P19**. A deviation requires written approval from the Quality Department.

## 3.4 Deviation handling

A deviation from the requirements in 3.2 and 3.3 may be accepted only after a documented consequence assessment. The assessment shall cover function across the entire specified temperature range.