BS EN 623-1:1995 Advanced technical ceramics. Monolithic ceramics. General and textural properties - Part 1. Determination of the presence of defects by dye penetration tests
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This Part of EN 623 describes qualitative methods
for determination of the presence of defects in
advanced monolithic technical ceramics by dye
penetration tests. The results are reported as visual
observations of dye penetration.
Three methods are described.
- Method A: A fuchsine dye test (see 5.1) which
is suitable for white or pale coloured ceramic
products, performed using an evacuation
technique.
- Method B: A fluorescent dye test (see 5.2)
which is suitable particularly for those products
where the purple fuchsine has insufficient visual
contrast with the ceramic, performed using a
proprietary test kit.
- Method
A fuchsine dye test (see 5.3) which
is performed by simple immersion in or spraying
with a dye solution, suitable for routine testing
for major defects.
NOTE 1. It is important to note that these methods allow only
certain types of defects to be detected. Defects which are not
revealed by these methods, but which may influence properties
and performance include cracks or pores not connected to the
surface, inclusions, certain types of grinding damage, and
residual stresses.
NOTE 2. Interpretation of results may become more difficult
with increasing porosity of the test pieces.
NOTE 3. General principles of dye penetration tests may be
found in EN 571-1. A test suitable for high-voltage insulators
using high-pressure dye penetration is cited in IEC 672. This
test is more searching for open porosity than any of the above
methods.
BS EN 623-1:1995 Advanced technical ceramics. Monolithic ceramics. General and textural properties - Part 1. Determination of the presence of defects by dye penetration tests
