Aggregate abrasion tester 508

multifunctionfor coating

Description
The MULTI GRIT TESTER 508 Select – incl. pressure vessel – is an electro-pneumatically controlled multi-blow test instrument of high precision. 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 – VDA module (separately available)
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 (VDA)
The MULTI GRIT TESTER 508 Select incl. VDA-Module is a stone hammer blow testing instrument that was developed in co-operation with the Verband der Automobilindustrie (VDA) and meets specifications of national and international standards. It is used to assess the resistance of single and multiple paint/coating layers against impacts caused by small bodies at high speed, as experienced on road and rail vehicles and related transport equipment.

Principle of the Test (VDA)
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) onto the specimen.

MULTI GRIT TESTER 508 Select – SAE module (separately available)
The bombardment of the test panels is carried out with determinate grit (according to ASTM D 3170) which is accelerated by compressed air. Dependent on the specifications of further standards other shot materials can be used. 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 incl. 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 SAE version 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 (SAE)
The MULTI GRIT TESTER 508 Select incl. SAE-Module is a stone hammer blow testing instrument equipped with an adjustable impact angle and intended for tests specified by SAE/ASTM and related standards.

Principle of the Test (SAE)
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

Standards

• DIN EN ISO 20567-1
• FORD FLTM BI 157-06
• RENAULT D24 1702
• PSA D24 1312
• DAIMLER DBL 5416
• SAE J 400
• ASTM D 3170

Characteristics / technical specifications

• Drive: Electro-pneumatic
• Display: Touch Panel
• Power supply: 85 - 264 VAC / 47 - 63 Hz (control circuit voltage 24 V)
• SAE Module (Select): approx. 34 kg
• VDA Module (Select-M): approx. 19 kg
• VDA Module (Select-P): approx. 22 kg
• Working pressure: (0 - 6) bar / adjustable
• Portable / Stationary: Stationary
• Time for feeding shot: adjustable
• Filling pressure control: approx. 5 bar (VDA), 7.8 bar overpressure (SAE), automatic switching depending on the module
• Dimensions Basic instrument: approx. 1150 x 550 x 1350 mm
• Net weight Basic instrument: approx. 125 kg
• Compressed air connection (SAE): min. 8 bar / max. 10 bar, requires connecting hose with ID 19 mm / Volume flow: min. 3 m³ / min
• Compressed air connection (VDA): min. 6 bar / max. 10 bar, requires connecting hose with ID 13 mm