ASTM C899-79(2007)
(Practice)Standard Practice for Use of Metric Units of Measure for Reporting Properties of Refractory Materials (COMMITTEE C-8 SUPPLEMENT TO E 380)
Standard Practice for Use of Metric Units of Measure for Reporting Properties of Refractory Materials (COMMITTEE C-8 SUPPLEMENT TO E 380)
SCOPE
1.1 This practice presents the units to be employed for reporting the properties of refractories, such as density, crushing stress, modulus of rupture, tensile stress, thermal conductivity, and permeability.
1.2 For convenience, a table of conversion factors between inch-pound units and SI units is included.
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Designation: C899 − 79(Reapproved 2007)
Standard Practice for
Use of Metric Units of Measure for Reporting Properties of
Refractory Materials
(COMMITTEE C-8 SUPPLEMENT TO E 380)
This standard is issued under the fixed designation C899; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
Multiplication
Factor Prefix Symbol
1.1 This practice presents the units to be employed for
reporting the properties of refractories, such as density, crush- 10 giga G
10 mega M
ing stress, modulus of rupture, tensile stress, thermal
10 kilo k
2 A
conductivity, and permeability.
10 hecto h
1 A
10 deka da
1.2 For convenience, a table of conversion factors between A
−1
deci
10 d
−2 A
inch-pound units and SI units is included.
10 centi c
−3
milli
10 m
−6
10 micro µ
2. Referenced Documents
−9
10 nano n
2.1 ASTM Standards: A
To be avoided where practical.
E380
3.3 The conversion factors, which have been selected for
2.2 ISO Standard:
theirgeneralutilityintherefractoriesindustry,havebeentaken
ISO 1000 SI Units and Recommendations for the Use of
from Standard E380, where possible. For uniformity, they have
Their Multiples and of Certain Other Units
been presented to four decimal places. In use, the converted
values should be rounded to the same number of significant
3. Significance and Use
figures as in the original value.
3.1 This practice is provided to facilitate comparison of
4. Standard Units
physical and mechanical properties of refractory materials by
establishing uniform presentation of data.
4.1 Density—grams per cubic centimetre (g/cm ).
3.2 Units have been chosen, where possible, to result in
4.2 Energy or work— joules (J) or megajoules (MJ).
numbers of magnitude familiar in the refractories industry, that
4.3 Mass—grams (g), kilograms (kg), or megagrams (Mg).
3 3
is, g/cm rather than the SI preferred unit kg/m.Itis
4.4 Permeabilityiscurrentlyexpressedindarcys.Onedarcy
recommended that SI prefixes be selected for use with the units
is a flow of 1.00 cm /s of a fluid of 1 centipoise (cP) viscosity
such that the resulting numerical values lie between 0.1 and
through a 1-cm cube of the material being measured under a
1000. For most properties, the prefixes kilo (k) and mega (M)
pressure differential of 1 atmosphere.Thus, a darcy is not an SI
are preferred. Other prefixes are given in the following table:
unit. No permeability units are given in E380. Until an SI unit
of permeability is adopted, express permeability in darcys.
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