VDA 19.1 Revision – New Knowledge on Technical Cleanliness

Cleanliness Test Laboratory (Source: Fraunhofer IPA)

1. Introduction

The VDA 19.1 guideline "Inspection of Technical Cleanliness" has been the international reference work for cleanliness testing of components for many years. After two years of intensive collaboration with over 40 companies, the yellow draft version of the third revised edition is now available.

The Fraunhofer IPA, as the leading institute, has accompanied and significantly driven the revision together with a broad industrial circle.

With the new edition, methods, testing procedures, and interpretation aids are brought up to date: practical, clearly structured, and expanded with numerous new content.

2. Background and Project Facts

– 2 years project duration
– 4 sub-working groups, 30 project meetings
– Over 25% more content compared to the previous version
– International networking: exchange with Chinese, Swedish, and French expert groups
– Supplemented by numerous bilateral company and expert meetings

3. The Main Innovations at a Glance

New Approaches to Cleanliness Testing

– Standard analysis: gravimetry + light optical analysis, supplemented by standardized REM/EDX analysis with defined parameters and material classes.
– Free testing for specific questions, e.g., for light/contrast-poor particles, with minimum requirements (qualified extraction, suitable filters, appropriate resolution).

Expansions in Light Optical Analysis

– New options for determining metallic luster.
– Direct inspection with camera systems or measuring heads as an alternative to traditional analysis.

Refinements for Small Particles (< 50 μm)

– Definition of suitable filters.
– Specification of pixel resolution.
– Approval of stereomicroscopes from 5 μm.

Other Innovations

– New flowcharts for extraction, rinsing procedures, and routine tests.
– Refinements in decay measurements.
– New guidance for designers and developers on deriving cleanliness specifications.
– Revised chapters on testing strategy, scope, frequency, measurement uncertainty.
– Numerous new case studies.
– Revision of all texts, graphics, and tables.

4. Opportunity for Participation

The yellow volume VDA 19.1 is already available online – in German and English. The feedback phase runs until October 31, 2025.