HMG Paints Ltd
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TECHNICAL LIBRARY
ARTICLE: KNB0019
19
SUBJECT:
CROSS HATCH TEST CLASSIFICATION
CLASSIFI
PAGE
1 of 2
Introduction
The idea behind a cross hatch adhesion test is to ascertain the level of adhesion of a particular
coating or number of coatings onto a substrate.
The cross hatch test is a pattern of right angle cuts in the paint surface through to the substrate.
substra
The cracking of line edges and the loss of adhesion of segments is compared with the scale of
results listed below.
The following information should only be used a guideline for classification of cross hatch test
results.
Test methods
BS3900-E6, ISO2409,
09, ASTM D3559-B.
D3559
Description
1.
The edges of the cuts are completely smooth, none of the squares if the lattice are
detached.
BS/ISO/DIN class 0.
ASTM class 5B.
2.
Detachment of small flakes of the coating at the intersections of the cuts. A cross cut area
not significantly greater than 5% is affected.
BS/ISO/DIN class 1.
ASTM class 4B.
3.
The coating has flaked along the edges and/or at the intersections of the cuts. A cross cut
area significantly greater than 5%, but not significantly greater than 15% is affected.
affect
BS/ISO/DIN class 2.
ASTM class 3B.
HMG Paints Ltd
Page 1
On name that covers everything
One
HMG Paints Ltd
TECHNICAL LIBRARY
One name that covers everything
ARTICLE: KNB0019
19
SUBJECT:
CROSS HATCH TEST CLASSIFICATION
CLASSIFI
PAGE
2 of 2
4.
The coating has flaked along the edges of the cuts partly or wholly in large ribbons,
and/or it has flaked partly or wholly on different parts of the squares. A cross cut area
significantly greater than 15%, but not significantly greater than 35% is affected.
BS/ISO/DIN class 3.
ASTM class 2B.
5.
The coating has flaked along the edges of the cuts in large ribbons and/or some squares
have detached partly or wholly. A cross cut area significantly greater than 35%, but not
significantly greater than 65% is affected.
BS/ISO/DIN class 4.
ASTM class 1B.
6.
Any degree of flaking that cannot be classified by the above class.
BS/ISO/DIN class 5.
ASTM class 0B.
Classification of cross hatch adhesion test results
Description
Surface
The edges of the cuts are completely smooth, none of the squares of the
lattice are detached.
Detachment of small flakes of the coating at the intersections of the cuts.
A cross cut area not significantly greater than 5%,
5 is affected.
The coating has flaked along the edges and/or at the intersections of the
cuts.
A cross cut area significantly greater than 5%, but not significantly
greater than 15%, is affected.
The coating has flaked along the edges of the cuts, partly or wholly in
large ribbons, and/or it has flaked partly or wholly on different parts of
the squares. A cross cut area significantly greater than 15%, but not
significantly greater than 35%, is affected.
The coating has flaked along the edges of the cuts in large ribbons and/or
some squares have detached partly or wholly. A cross cut area
significantly greater than 35% but not significantly greater than 65%, is
affected.
Any degree of flaking that cannot even be classified by classification
4/1B.
HMG Paints Ltd
Page 2
NONE
BS/ISO/DIN ASTM
0.5
B
1
4B
2
3B
3
2B
4
1B
5
0B
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