Mechanised Scratch Tester 705


Coating performance is related to many factors that include
the hardness of the coating with otherphysical properties
such as adhesion, lubricity, resilience, as well as the
influence of coatingthickness and curing conditions.
It is a quantifiable indication of the extent to which serious
damage is resistedwhen a loaded needle israked across
a relatively smooth, flat surface. The motor driven machine is
recommended as it providesbetter repeatability of test performance.

Mechanised Scratch Tester
This machine is encased with a cover enclosing thegears and other parts for operating the slide at aconstant
speed (3-4 cm per second) and the arm liftingmechanism. The needle arm is counterpoised and rigid to
prevent whip or chatter at the ball-point.

A 1mm tungsten carbide ball ended needle (normallysupplied with each instrument)is held in a chuck
at 90ºto the test panel and can be easily removed forinspection andreplacement.
The tungsten carbideneedle will provide with care, a long useful life withouttheneed to replace the tip after
each test.

Weights providing increments of 100 g to 2 kg (0-20 N)mass are loaded above the ball ended needle (or stylus),
additional weights up to maximum 10 kg loading areavailable as optional accessories for harder coatings.

Standard test panels (usually metallic) of 150 x 100 mm withthickness up to 1.65 mm can be used, however upon requestprovision can be made to accommodate thicker panels ifrequired.

A plastic protective screen is available to avoid injury orintrusion into the mechanism or whilst instrument is activated.

200/250V 5OHZ AC supply.

Method of test
Reference should be made to the relative test procedure, in general as follows:

1. Check suitable needle/stylus is fitted.
2. Clamp test panel to slide.
3. Load needle arm with weights to determine threshold of failure,
a. as specified for go/no go tests. Or
b. progressively increasing load until failure occurs.
4. Actuate slide. If failure occurs, needle on voltmeter will flick over.
5. Only conductive metallic panels will be suitable for this test result.
6. Remove panel for visual assessment of scratch.

ECCA Metal Marking Resistance test is a procedure designed to evaluate the resistance to a smooth organic coating whenrubbed by a metallic object.

The standard model Scratch Testers can be used by simply substituting the ball-ended needle for a special tool onto
which 15um thick annealed aluminium foil is attached.

ASTM D2197 Scrape Adhesion Test and D5178 Mar Resistant Test call for a test procedure, which requires a radius
stylus, thisis presented to the test panel at a 45º angle.

International standards
The Mechanised Scratch Tester (SH0530) has been updated to offer the weight set required by ISO 1518-1.

We continue to offer the weight set specified by the preceding international standard, ISO 1518, as spares (SH4783).

Please contact us if you wish to purchase a replacement weight set to update your machine to ISO 1518-1.

Mechanised Mar Resistance Tester SH705/1 - ASTM D5178.
Mechanised Scratch Tester SH705/2 - ASTM D2197.

Ordering information – Mechanised Scratch Tester (705)

 Mechanised Scratch
 SH0530  Mechanised Scratch Tester - ISO 1518-1 (230VAC, 50HZ)
 35 mm/s table speed, tungsten carbide hemispherical stylus, 20 N set of weights
 (2 x 0.5 N, 1 x1.0 N, 2 x 2 N, 1 x 4 N and 1 x 10 N) and 1 spindle).
 SH4783  2 kg Set of Weights (1 x 100 g, 2 x 200 g, 1 x 500 g, 1 x 1000 g) (superseded  standard)

 Accessories and   spares  
 SH4811  Weight set for ISO 1518-1 (2 x 0.5 N, 1 x 1.0 N, 2 x 2 N, 1 x 4 N and 1 x 10 N)
 SH4783  2 kg Set of Weights (1 x 100 g, 2 x 200 g, 1 x 500 g, 1 x 1000 g) (superseded   standard)

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