Scratch Hardness Tester LINEARTESTER Model 249

Model 249

Order number: 02630131

Multi-function device, linear single stroke and double stroke to 9999, scratch, rub, wipe, chemicals

Description

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 like 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.

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. 021010132).

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.

When testing insulating coatings on conducting substrates, an electric recognition of the through-scratching offers an additional security for setting the scratching force.

For abrasion tests, crockmeter tests, MEK or wipe tests the test movement is carried out with the tool lowered onto the specimen, in preset cycles to and fro. For this, the guide plate has to be removed from the slide plate. There are three fixed as well as one freely programmable test speeds available.

In addition to the fixed stroke length of 60 mm, the LINEARTESTER can be equipped optionally with variable stroke lengths (five additional stroke lengths of 35 mm, 50 mm, 65 mm, 80 mm and 95 mm).

Design

The LINEARTESTER 249 is a tabletop unit. The electromotive drive ensures a uniform forward motion of the slide. The test tool is lowered and lifted automatically when scratch/scribe tests are carried out. A multitude of different test tools are available. With the optional available universal adapter set (see last page) even also several user-specifc tool inserts can be used.