Abrasion Scrub Tester0 pages

Abrasion Scrub Tester
Appearance
Coated surfaces need to be tested for resistance to abrasion
caused by a brush, sponge, or other means. The Wet Abrasion
Tester produces a repeatable, controlled condition to simulate
everyday use or wear patterns.
The abrasion tester can examine washability and related properties that affect the stain resistance of coatings. Detergent performance testing can also be determined in a reproducible manner.
■t Features two brush holders for side by side testing
■t Air cooled electric motor for maximum reliability
■t Peristaltic fluid pump – no reagent contamination (except for
PB-5002, PB-5007)
■t Five digit preset counter – activates the machine for preset
number of strokes, then switches off
■t Can be modified to meet DIN, ISO, or ASTM test methods
Standards
ASTM
D 2486, D 3450, D 4213,
D 4828
53778*, 13 300
11998
DIN EN
ISO
DIN ISO Methods
The Wet Abrasion Scrub Tester is designed to comply with four
ASTM methods.
DIN 53 778 (*withdrawn 08/2007): Dispersion Paints
Cleanability: Test area should be free of pollutions
Wash resistance: Evaluation after 1000 scrub cycles
Scrub resistance: Evaluation after 5000 scrub cycles
The test is performed wet using a hog bristle brush and a pump to
apply the washing liquid. The evaluation is done visually.
DIN EN 13300
This standard describes the various testing methods for waterborne coating materials and coating systems for interior walls
and ceilings. One quality criterion mentioned is the wet-abrasion
resistance tested in accordance to EN ISO 11998. Additionally,
a rating scale dependent on the amount of abrasion is used for
final classification.
ASTM D 3450
This test method determines the ease of removing soilant discoloration from interior coatings. The coating is drawdown on a black
plastic panel and allowed to dry for seven days. A specified soilant
medium is applied. The coating is scrubbed with an abrasive or
non-abrasive media using a cellulosic type sponge for 100 cycles.
The soilant removal is assessed by measuring the CIE Y reflectance
before and after the test.
ASTM D 4213
The purpose of this method is to measure scrub resistance. The
primary differences from ASTM D 2486 method are: The scrub
resistance is determined by weight loss of the paint film relative to
a standard calibration panel. The test panel and calibration panel
are scrubbed simultaneously. The scrubbing device is a ScotchBrite™7448 abrasive pad.
ASTM D 4828
This test method determines the relative ease of removing soil and
stains from interior coatings. The coating is applied to a black plastic panel and dried for seven days. The soilant can be user defined
or the soilant described in ASTM D 3450 can also be used. A user
defined liquid or powder cleaner is applied. The panel is scrubbed
100 cycles with a sponge. The soilant removal is assessed using
gloss or color measurement.
131
Index
BYK-Gardner GmbH • Lausitzer Strasse 8 • 82538 Geretsried • Germany • Tel +49 8171 3493-0 • Fax +49 8171 3493-140
Technical Service
ISO 11998
The ISO test method describes a short version of the scrub abrasion test. This test uses “3M Scotch Brite 7448“ pads and the
washing liquid is manually applied before starting the test. The
test is finished for evaluation after 200 scrub-cycles. The evaluation of the wash/scrub resistance is done by calculating the loss
of mass.
ASTM D 2486
The scrub resistance of interior wall paint is the primary purpose
of this method. The paint is applied to a black plastic panel and
allowed to cure. The panel is scrubbed with a nylon bristle brush
until failure occurs. An abrasive scrub media is used to accelerate
the test.
Physical Properties
Abrasion
The Standards EN ISO 11998 and DIN EN 13330 (replaced DIN
53778) describe procedures to evaluate the resistance of coatings
against abrasion by cleaning or scrubbing the surface. The coating
is applied on a foil and dried under standard conditions. In order
to describe the cleanability, defined pollutions are applied onto
the surface before starting the test.
ASTM Methods
Color
Liquid solutions are pumped to the brush heads from the detachable container mounted to the side of the tester. The pump may
be switched on or off during the course of testing, and the flow
can be adjusted for precise dosing.