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Technical cleanliness of components and systems
TECSA standards & regulations
VDA volume 19
This Cleanliness Handbook is intended as a guide to help you find reference values in respect of cleanliness coding. The comparison photos give you an overall picture of the particle counts of the respective code. There are currently no standardized requirements with regard to component cleanliness, consequently the values listed here should be taken as a recommendation only as other values may also occur.
2001 marked the formation of the TECSA industrial association under the aegis of the Fraunhofer IPA, of which HYDAC International GmbH is a member. 2003 saw the achievement of a unified cleanliness standard with regard to verifying component cleanliness. This resulted in VDA volume 19 and ISO 16232. To date it has not been possible to standardize the
requirements made of components with regard to their permissible surface contamination.
Cleanliness standard to be satisfied by components
The tables on the following pages listing the Component Cleanliness Codes (CCC codes) and maximum particle size are the result of our experience over the past few years. Values below the 25 μm level are considered informative in most cases. Values above the 800 μm level must be considered to be one-off occurrences. Cleanliness requirements can be broken down into component cleanliness, logistical cleanliness and assembly cleanliness.
One-off occurrences of particles and contamination which cannot be classified so as to provide meaningful information. Consequently, recurrent critical events are highly significant as they can be pinpointed and eliminated, if necessary.