Erichsen Scratch Hardness Tester 430 P
Purpose and ApplicationThe motor-driven SCRATCH HARDNESS TESTER 430 P is a universal testing instrument designed for carrying out a wide range of tests on varnished and plastic surfaces to determine their resistance to scratches and cuts. Single cuts, parallel cuts and - by turning the specimen by 90o -cross-cuts can be applied to test panels of various thicknesses.
The SCRATCH HARDNESS TESTER 430 P is particularly provided for adhesion tests using the cross hatch cut method (in accordance with all mostly required standards) and for specific plastics tests according with Opel (scratch resistance and writing effect). For these as well as for further tests numerous setting possibilites on the basic instrument and a large variety of test tools are available. Using the SCRATCH HARDNESS TESTER 430 P, series testing can be conducted with much greater ease. The results of testing are reproducible and well-defined.
Design and Function
The SCRATCH HARDNESS TESTER 430 P is a benchtop instrument of sound mechanical construction which provides reliable, well-defined cuts, even under extreme test conditions. The test procedure is carried out automatically and all parameters (cutting speed, cutting stroke, crosscut pattern) can be set using the keyboard. Each motion sequence (transport of test panel, cut positioning and any required pressure adjustment) is driven by a separate step motor.
During the test the specimen is conveyed linearly and at a constant speed under the test tip which has been set at the required pressure load (max. 40 N). A transmission guide ensures that the test tip is lowered onto the test panel as defined. The scope of supply includes two control plates for different cross-cut patterns which can be easily interchanged. With Model 430 P parallel cross hatch cuts with graduated test forces are possible. After carrying out the first cross hatch cut the instrument can be stopped and the test force (up to 50 N) can be adjusted individually before starting the next test track.Theoretically, 80 test tracks with a distance of 0.5 mm of different test forces are possible
within the pre-selected cross hatch cut programme.
The SCRATCH HARDNESS TESTER 430 P is power-driven and obtainable in two versions - with manual or with motor-driven force regulation. On the manual version it is a simple matter to adjust the test force to the exact pressure. The instrument with motor-driven force regulation provides the additional benefit of conducting a trial run with gradually increasing force. In this way, the force required to achieve a through cut can be automatically ascertained in the course of a "trial cut" A 6-piece weight set is available as an optional accessory for conducting special tests in the lower
pressure range and enables cuts with test forces in the range (1 - 15) N - graduated in 1-N steps.
* 2 cutting speeds and 2 cutting lengths which can be combined as requiredÃ‚¢*
9 preset cross-cuts in compliance with the most commonly used standards
Ã‚¢* 1 freely programmable cross-cut pattern for special applications
Ã‚¢* Setting for cut distance with step motor precision
Ã‚¢* "Stop"-option within the cross hatch cutting mode, for individually changing the test force
for the next scratch track of the concerning current cross-cut pattern
Ã‚¢* Visual display upon cutting through insulating layers to metal substrate
Ã‚¢* Rapid clamping device for test panels, with, wide clamping range.
Cross Hatch Testing
The SCRATCH HARDNESS TESTER 430 P enables cross hatch tests to be conducted in accordance with all the usual standards, summarized in the following table, and carried out immediately without additional programming. The following cross-cuts can be selected by pressing a key (number of cuts x distance in mm between cuts) 2 x 5, 6 x 1, 6 x 2, 6 x 3, 8 x 1, 8 x 2, 11 x 1. The cuts are carried out automatically in succession using the test tip for cross hatch at a cutting speed of 40 mm/s. After turning the test panel manually by 90o, the procedure is repeated to complete the cross-cut pattern. The load required to ensure that the layer of varnish will be cut through to the substrate must be ascertained in trial runs. With Model 430 P-II(motor-driven force adjustment) this can be carried out very simply by performing a "trial cut". For the examination of cross hatch cuts a magnifiying glass with 2.5 magnification is included in the scope of supply. To evaluate the cross hatch pattern achieved, it is visually related to a comparison pattern within a scheme indicated in the relevant standard (cross cut classification). In ECCA T6 it is mentioned that the cross hatch cut test may be intensified by a subsequent cupping test according to DIN EN ISO 1520. For this purpose we recommend the ERICHSEN Lacquer and Paint Testing Machines, models 200 and 202 C. Although the results of adhesion tests in accordance with the cross hatch method are comparable with each other, they are - due to their respective procedures - not transferable to results of alternative test methods (e.g. perpendicular pull-off test according to DIN EN ISO 4624).
SCRATCH HARDNESS TESTER 430 P
Dimensions (W x H x D) 330 x 460 x 750 mm
Net weight approx. 40 kg
Power supply 1) 230 VAC / 50 Hz
Consumption 400 W
Test panel format, min. 80 x 50 mm
Test panel format, max. 165 mm wide, any length
Thickness of specimen 0.5 - 20 mm
Standard load range 2 - 50 N (2-N grading)
Special load range 2) 1 - 15 N (1-N grading)
Cutting path 25 or 40 mm
Cutting speed 1 m/min or 40 mm/s