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Testing Apparatus in EN ISO 11998 (Paints and varnishes-Determination ofwet-scrub resistance and cleanabilityof coatings)

Posted Date:2025/10/21

6 Apparatus

6.1 Test panel, made of PVC film free of migration-susceptible chemical plasticizers, of sufficient rigidity to 6.1 ensure a flat surface, impervious to and unaffected by water or aliphatic organic solvents and of nominalthickness 0,25 mm, approximately 430 mm long and not less than 80 mm wide.

Other types of plastics film may be used where the coating contains solvent which might adversely affect the PVC film. If the coating delaminates before or during the test, another, more suitable, substrate shall be used.

6.2 Film applicator, preferably an automatic film applicator, used at an application speed of 10 mm/s to 15 mm/s and fitted with a doctor blade with an appropriate gap clearance and a gap width of at least 60 mm.

6.3 Wet-scrub tester apparatus, consisting of a reciprocating scrub testing machine with a stroke length of(300 + 10) mm and operating at approximately (37 + 2) scrub cycles per minute. A counter for recording the number of scrub cycles shall be provided.

6.4 Scrub pad holder, consisting of a metal plate fitted with pins to hold the abrasive pad. A mounting device with elongated holes is loosely fitted on the top of the plate (see Figure 1 and Figure 2). The mass of the scrub pad holder which exerts a downward force on the test panel shall be (135±1) g.