ASTM C987-00a

Standard Practice for Vapor Attack on Refractories for Furnace Superstructures

SCOPE
1.1 This practice describes a procedure for comparing the behavior of refractories in contact with vapors under conditions intended to simulate the environment within a glass melting or other type of furnace when refractories are exposed to vapors from raw batch, molten glass, fuel, fuel contaminants, or other sources. This procedure is intended to accelerate service conditions for the purpose of determining in a relatively short time the interval resistance to fluxing, bloating, shrinkage, expansion, mineral conversion, disintegration, or other physical changes that may occur.
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Oct-2000
• ICS: 81.080 - Refractories
• Technical Committee: C08 - Refractories
• Drafting Committee: C08.10 - Refractories for Glass

Relations

• Replaced By: ASTM C987-00a(2005) - Standard Practice for Vapor Attack on Refractories for Furnace Superstructures
• Effective Date: 01-Mar-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C 987–00a
Standard Practice for
Vapor Attack on Refractories for Furnace Superstructures
This standard is issued under the fixed designation C 987; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope be representative of those found in service. It is imperative that
the the user understand and consider how the results of this
1.1 This practice describes a procedure for comparing the
practice may differ from those encountered in service. This is
behaviorofrefractoriesincontactwithvaporsunderconditions
particularly likely if the reaction products, their nature, or their
intended to simulate the environment within a glass melting or
degree differ from those normally found in the actual service
other type of furnace when refractories are exposed to vapors
environment.
from raw batch, molten glass, fuel, fuel contaminants, or other
2.5 It is incumbent upon the user to understand that this is
sources. This procedure is intended to accelerate service
an aggressive, accelarated practice and to be careful in inter-
conditions for the purpose of determining in a relatively short
preting the results. If, for example, the reaction species have
time the interval resistance to fluxing, bloating, shrinkage,
never been found in a real world furnace, then this practice
expansion, mineral conversion, disintegration, or other physi-
should not necessarily be considered valid to evaluate the
cal changes that may occur.
refractory in question.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Apparatus
responsibility of the user of this standard to establish appro-
3.1 The crucible for containing the reactant shall be a dense
priate safety and health practices and determine the applica-
alumina or platinum crucible of conical shape with dimensions
bility of regulatory limitations prior to use.
of 43 mm in diameter at top, 33 mm in diameter at bottom, and
2. Significance and Use 53 mm high.
3.2 The crucible-cover assembly (Fig. 1) may be supported
2.1 This practice provides a guide for evaluating the resis-
within a suitable refractory holding crucible (Fig. 2) such as
tance of refractories in glass melting furnace superstructures to
mullite to maintain the position of the cover, if an excessive
vapor attack. This test method may also be useful for evaluat-
amount of glass phase reaction product is anticipated.
ing refractories in other applications where vapor attack
3.3 The electric heating chamber shall be of sufficient size
occurs.
to accommodate at least three assemblies for comparative
2.2 An electric-heated furnace is recommended. Water va-
evaluation. The temperature control system shall be capable of
por and other atmospheric components in a gas- or fuel-fired
maintaining a desired holding temperature with a tolerance of
furnace may participate in the chemical and physical reactions
63°C.
being studied. Results may differ, therefore, depending upon
the nature and type of firing employed.
4. Specimen Preparation
2.3 The degree of correlation between this practice and
4.1 The test specimen shall conform to the following
service performance is not fully determinable. This is intended
dimensions with major faces cut or ground parallel and flat to
to be an accelerated practice that generates a substantial degree
form a tight seal with top of crucible:
of reaction in a relatively short amount of time. This accelera-
4.1.1 Length, 55 6 2 mm,
tion may be accomplished by changing the composition and/or
4.1.2 Width, 55 6 2 mm, and
concentration of the reactants, increasing temperatures, or by
4.1.3 Thickness, 20 6 1.0 mm.
performing the test in an isothermal environment.
4.2 Selection—Use specimens that are free of defects such
2.4 Since the practice may not accurately simulate the
as cracks, fissures, and voids. Where obvious defects in
service environment, observed results of this practice may not
specimens appear after testing is completed, disregard the
results and repeat the test.
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