Refractoriness Under Load Of Refractory Materials

Refractoriness points to temperature at which the material softens. Refract
oriness under load (RUL) is a measure of the deformation behavior of refrac
tory ceramic products subjected to a constant load and increasing temperatu
re.
RUL is a critical property for refractory bricks, which basically reflects
the service temperature of the bricks, raw materials, etc. The RUL is of gr
eat importance to check the suitability of refractory products for high-tem
perature applications. It gives an indication of the temperature at which t
he bricks will collapse, in service conditions with similar load. The refra
ctoriness is indicated by PCE (Pyrometric cone equivalent). It should be hi
gher than the application temperatures.
Refractoriness decreases when refractory is under load. Refractoriness unde
r load is an important consideration because usually a refractory fails at
a lower temperature when subjectured to load. Therefore more important is r
efractoriness under load (RUL) rather than refractoriness.
The refractoriness under load test (RUL test) gives an indication of the te
mperature at which the bricks will collapse, in service conditions with sim
ilar load. However, under actual service where the bricks are heated only o
n one face, most of the load is carried by the relatively cooler rigid port
ion of the bricks. Hence the RUL, test gives only an index of the refractor
y quality, rather than a figure which can be used in a refractory design. U
nder service conditions, where the refractory used is heating from all side
s such as checkers, partition walls, etc. the RUL test data is quite signif
icant.
It is generally measured as the softening temperature. It is necessary that
a refractory material should have a softening temperature higher than the
operating temperature of the furnace in which it is to be used. Most of the
commercial refractories do not exhibit sharp melting points and they softe
n gradually over a range of temperatures. The temperature range in which th
e softening of refractory products occurs is not identical with the melting
range of the pure raw material; therefore it must be reliably determined.

RUL values(T0.6 @0.2MPa) for fireclay-based refractory bricks are usually b
es could vary depending different industrial standards,different companies
in different areas.
Sunrise Refractory is a refractory supplier from China, specializing in man
ufacturign various types of refractories for glass industry including fused
cast AZS 33#,36#,41#, glass furnace fireclay bottom block, mullite brick,
zircon brick, alumina bubble brick, sillimanite brick, corundum brick, low
porosity fireclay brick, high alumina brick, all kinds of glass furnace ram
ming masses, sealing materials, building fireclay, etc.
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