Pencils of various grades of hardness are moved over the painted surface at an angle of 45° to the horizontal with a force of 5 N, 7.5 N or 10 N (± 0.1 N). The pencil hardness is defined by those two grades of hardness the softer one of which just produces a writing trace while the next harder one leaves a perceptible scratch on the coating.
A steel block with circular indented inserts is applied onto the test surface and produces a pressure mark, the length of which is measured with a microscope. The impression hardness in accordance with Buchholz is established from the length of the impression, using the standard table
.
The optimized scratch hardness tester LINEARTESTER 249 is intended, in addition to its original purpose of application, i. e. to establish the ability of a surfaces to resist damage by scratching, also for several other tests: – Scribe/Scratch tests – To and fro-cycle abrasion tests – Crockmeter tests – MEK tests, tests determining the resistance against solvents in general or wipe test, respectively. Scratching force in the range of (0.5 – 20) N, with electromotive drive, including circular level, power pack and operating manual.
The MULTI GRIT TESTER 508 VDA 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 VDA 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 new MULTI GRIT TESTER 508 SAE is a stone hammer blow testing instrument equipped with an adjustable impact angle, contrary to the execution of VDA. 508 VDA acc. To DIN EN ISO 20567-1, FORD FLTM BI 157-06, RENAULT D24 1702, PSA D24 1312, DAIMLER DBL 5416. 508 SAE acc. To SAE J 400, ASTM D 3170.
Options include: Impact Cabinet RIMpact I (for models 508/SAE and VDA) Enables the user to test complete rims respectively and in principle several other larger sized specimens.
Analysis system GRITSCAN for the automatic evaluation of impact images. It is a surface analysis system consisting of a combination of hardware and software, especially for capture and analysis at impact images.
Practical test method to determine the quality of coated metal sheets by deformation in a sudden blow The Bend and Impact Tester is used to measure both flexibility and impact resistance of light gauge sheet metal, or tube stock, coatings in a single operation. The test simulates punching, beading, crimping and similar operations.
Portable and handy instrument especially designed for tests on enamel in accordance with DIN 51 155. Enables the user to carry out tests on site.
ERICHSEN Impact Tester 304 are used for determination of impact resistance, deformability and tensibility of coatings and substrates as well as adhesion of the coatings. The ball impact test simulates this type of stress under standardised conditions. A ball punch of defined weight the bottom of which is of fixed diameter, is dropped freely down a guide tube from an agreed or variable height. ASTM D 2794 ISO 6272-1 ISO 6272-2
To measure adhesion of coatings in accordance with ASTM D 4541 by pulling off stuck on dolly. Robust unit requiring no electrical supply and therefore particularly suited to application in the field. Complete test case with necessary accessories. 4 versions for measuring ranges 5/10/25 N/mm2 and special version for measuring on concrete surfaces.
The motor-driven SCRATCH HARDNESS TESTER 430 P-Smart 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 90° – cross-cuts can be applied to test panels of various thicknesses. The SCRATCH HARDNESS TESTER 430P-Smart 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 possibilities on the basic instrument and a large variety of test tools are available to perform DIN EN ISO 2409, ASTM D 3359, JIS K 5600-5-6, SNV 37 111, VDA 621-411, ECCA T6, GME 60280, GMW14688 & many other test methods. Using the SCRATCH HARDNESS TESTER 430 P-Smart, series testing can be conducted with much greater ease. The results of testing are reproducible and well-defined. Optionally with manually actuated/motor-driven loading force and manually actuated/automatic test panel turn. Operation, documentation and data management via ERICHSEN-App
Successful instrument for producing a cross cut pattern in the coating to be tested Besides the universally applicable single blade instrument with folding ruler. 5 special multi-cutter versions available for tests in accordance with the standards listed. ISO 2409, EN ISO 24091), JIS K 5600-5-6, EN 13523-64(formerly ECCA-T6), ASTM D 3359, VDA 621-411, DBL 5416, ISO 2409-1972, BS 3900:E6, NF T 30-038 (all withdrawn)
Available option is the CrossScan 295/XVI Automatic Cross Hatch Cut Rating System ; evaluation software; consists of a handy dome for placing on the crosshatch pattern to be evaluated; equipped with camera, LED lighting and potentiometer for intensity control of lighting (5% – 100%). The evaluation takes place via the included software (PC not included).