LINEARTESTER 249 - Senze-Instruments

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LINEARTESTER 249

Coatings & Industry > Physical properties > Hardness

The Erichsen 249 LINEARTESTER

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.

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.)
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 throughscratching 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.

Spherical inserts for the clamping adapter (short shaft without clamping device)  

  • Test tip acc. to van Laar (Ø 0.5 mm)  

  • Test tip acc. to Bosch (Ø 0.75 mm)  

  • Test tip acc. to ISO (Ø 1.0 mm)  

  • Test tip acc. to ISO (Ø 1.0 mm) – additionally covered with an extremly hard layer  

  • Test tip acc. to BMW (Ø 3.0 mm)  


Asymmetric inserts (short shaft with clamping device)  

  • Test tip acc. to Clemen (R 1.0 mm)  

  • Test Tip for cross hatch cutting (30°) – additionally covered with an extremly hard layer  

  • Inserts (Ø 16 mm/R 0.5 mm) for the disc adapter  

  • Test discs made of Duroplast (p. 10 pcs.)  

  • Test discs made of copper (p. 10 pcs.)  

  • Test discs made of stainless steel (p. 10 pcs.)  

  • Test discs made of stainless steel, additionally covered with an extremly hard layer (p. 10 pcs.)  


Adapter for abrasion tests

  • Squarish adapter (egde length 25 mm)  

  • Cylindrical adapter (dia. 25 mm)  


Accessories  

Test Tip with long shaft  

  • Test tip acc. to Clemen (R 1.0 mm)  

  • Test tip acc. to van Laar (Ø 0.5 mm)  

  • Test tip acc. to IHD (Ø 0.6 mm)  

  • Test tip acc. to ISO (Ø 1.0 mm)  

  • Test tip acc. to VW (3 mm/60°)  

  • Test tip acc. to (0.5 mm/90°)  

  • Test tip acc. to (1.0 mm/90°)  


Equipment for MEK test  

  • MEK-Attachment  

  • Test plugs made of high dense special felt (per 100 pcs.)  


Equipment for Crockmeter test  

  • Test set for MEK test  

  • Crocking cloth (per 1000 pcs.)  


Universal adapter set and accessories

  • Universal Adapter Set  



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