MULTI GRIT TESTER 508 Select

The MULTI GRIT TESTER 508 Select - incl. pressure vessel - is an electro-pneumatically controlled multi-blow test instrument of high precision, and its special feature is the good repeatability and comparability of the test results obtained.The MULTI GRIT TESTER 508 is used to assess the ability of single and multiple layers of paints and similar coating materials to stand up to the impacts caused by small bodies of low mass hitting the specimen at high speed as experienced on road and rail vehicles and other equipment used in the transport field. The clear arranged menu navigation via the touch panel has password-protected levels, which protect against unauthorized access (such as program changes). With the modular MULTI GRIT TESTER 508 Select, the user only needs one basic unit, which can be converted with little effort for bombardment tests "according to VDA" or "according to SAE".

MULTI GRIT TESTER 508 Select incl. separately available VDA module

The specimen is subjected to impacts by sharp-edged steel shot accelerated by compressed air. An air accumulator in the system eliminates effects of momentary pressure variations in the external compressed air supply. The shot is entered automatically using an adjustable vibratory feed.

Purpose and Application: The MULTI GRIT TESTER 508 Select inlc. VDA-Module is a stone hammer blow testing instrument that at first was developed in co-operation with the "Verband der Automobilindustrie (VDA)" (Association of the Automotive Industry) but now also meets the specifications of national and international standards. The MULTI GRIT TESTER 508 Select incl. VDA-Module is used to assess the ability of single and multiple layers of paints and similar coating materials to stand up to the impacts caused by small bodies of low mass hitting the specimen at high speed as experienced on road and rai l vehicles and other equipment used in the transport field.

Principle of the Test: A defined number of impact bodies of specified shape, material and surface quality is made to impinge for a given period of time and with a defined energy at a determinate angle (54° in accordance with DIN/ISO) of impact onto the specimen.

MULTI GRIT TESTER 508 Select incl. separately available SAE module

The bombardment of the test panels is carried out with determinate grit (according to ASTM D 3170) which is accelerated by compressed air. Dependent of the specifications of further standards (mostly of car manufacturers) other shot materials can be used, too. The shot is entered automatically using an adjustable vibratory feed. On a multifunctional display the working pressure, the duration of the test, the setting of the vibratory feed and the number of tests conducted (total / temporary) can be read off alternatively. An air accumulator in the system eliminates effects of momentary pressure variations in the external compressed air supply. 

The specimen fixing device of the MULTI GRIT TESTER 508 Select inlc. SAE-Module is provided with an adjustable impact angle. The adjusting unit for the impact angle allows to adjust the orientation of the test panel relative to the direction of impact in the range from 30° to 90° in steps of 15°. Contrary to the VDA version, the test panel in the MULTI GRIT TESTER 508 Select incl. SAE-Module is located completely within the testing room during the whole bombardment procedure.Due to numerous technical differences between both versions (conditional on the standards), a test in accordance with VDA using the SAE version, is not intended and thus technically excluded.

Purpose and Application: The new MULTI GRIT TESTER 508 Select incl. SAE-Module is a stone hammer blow testing instrument equipped with an adjustable impact angle, contrary to the execution of VDA.

Principle of the Test: A defined number of impact bodies of specified properties is made to impinge for a given period of time and with a defined energy at a determinate angle of impact onto the specimen.

Scope of delivery:

• MULTI GRIT TESTER 508 Select (basic unit - without the modules required for the tests according to VDA or SAE)
• Pressure vessel
• Operating instructions