Ability of a coating to resist degradation due to mechanical wear by hard and rough
objects (mechanical erosion) thanks to the ability to dissipate the applied mechanical
energy. Abrasion resistance can be enhanced by incorporation of surface modifying additives.
Adhesion
Degree of attachment between a coating film and the underlying material to which it is
in contact. The two surfaces are held together by interfacial forces which may consist
of valence forces or interlocking action.
Alkali Resistance
The degree to which a paint resists reaction with alkaline materials such as lime,
cement, plaster, soap, etc.; a necessary property for paints in bathrooms, kitchens, laundries.
Test [Copper-Accelerated Acetic Acid Salt Spray (Fog) ]
CASS The salt spray test is a standardized test method used to check corrosion
resistance of coated samples. Salt spray test is an accelerated corrosion test
that produces a corrosive attack to the coated samples in order to predict its
suitability in use as a protective finish.
Chemical Resistance
Coating's resistance to solvents, acids, and alkali testing done under watch glass
for 24 hours.
Cyclic Corrosion Test
Cyclic Corrosion testing is intended to be a more realistic way to perform salt
spray tests than traditional steady state exposure. Because actual atmospheric
exposures usually include both wet and dry conditions, it is logical to pattern
accelerated laboratory tests after these natural cyclic conditions.
Dry Time
Time needed for an applied coating film to reach a set stage of cure or hardness.
Falling weight
This test method covers the determination of the energy required to rupture coatings
applied to pipe under specified conditions of impact from a falling weight.
Flexibility
Degree at which a coating is able to face a deformation of its supporting surface
without cracking or flaking.
FTIR
Fourier transform infrared (FTIR) spectrometers record the interaction of infrared
radiation (light) with experimental samples, measuring the frequencies at which the
sample absorbs the radiation and the intensities of the absorptions. Determining
these frequencies allows identification of the sample’s chemical makeup, since
chemical functional groups are known to absorb infrared radiation at specific
frequencies. FTIR is most often used to identify paint binders and differentiate
between general classes, such as oil based polyesters or acrylic latexes. Some
pigments and inorganic materials can also be identified in a general sense through
this method.
Free falling sand abrasion
Free falling sand abrasion is reported as the abrasion resistance of the coating on the
panel. Both silica ASTM D968 measures the resistance of organic coatings to abrasion
produced by abrasive falling onto coatings applied to a plane rigid surface, such as
a metal or glass panel. The abrasive is allowed to fall from a specified height
through a guide tube onto the coated panel until the substrate becomes visible.
The amount of abrasive per unit film thickness sand or silicon carbide can be used.
Gloss
Sheen or ability of a surface to reflect light. Gloss is measured at a 60° angle.
Impact Resistance
Ability of a coating to resist deformation or cracking due to a forceful blow.
Peeling
Paint or coating lifting from the surface due to poor adhesion.
Scratch resistance
Ability of a coating surface to resist to damage caused by sharp and hard objects.
Influenced by the hardness, the coefficient of friction and the thickness of the film.
Scrub resistance
Ability of a coating surface to resist to damage caused by rough objects in the
presence of an active medium (water or organic liquid, abrasive material).
Volatile Content
Amount of solvent or liquid components in a coating.
