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Scratch Hardness Tester (LINEARTESTER 249)

Model Number: LINEARTESTER 249

Purpose and Application
The optimised 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, 4-position height adjustable load arm, standard height 10 mm (+ 20 mm / + 40 mm / + 60 mm) *; including hex key, circular level, power pack and operating manual.

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INDUSTRY: Paint & Powder Coating Industry

APPLICATION: Physical Test Equipment

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Principle of the Test
The test panel is fixed onto a mobile slide by means of clamping rails. Above this slide and held on two metal pillars is a reciprocating beam bedded in a free-moving manner and carrying the adequate test tool as well as a weight.
The required scratching force in the range of (0.5 to 20)N is set by moving the weight along the reciprocating beam, making use of a setting scale (an additional load weight of (1
to 40)N is optionally available). The testing machine is equipped with a 4-position height adjustable load arm device with standard height of about 10 mm (+20/+40/+60 mm). To use the vertical adjustment, a set of guide plate high level adapters is also required (Order No. 02101.01.32).
To start a scratch/scribe test, the test tool is lowered onto the specimen when moving forward initiating the scratching
process immediately. The optionally used guide plate lifts the tool up, when the slide with the sample plate moves back.

The test panel can be moved sideways so that a series of scratches can be carried out side by side with different force settings. Due to a ruler integrated in the slide plate, an uniform distance between the scratches can be achieved very easily.

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