ASTM F7-95(2011)

Standard Specification for Aluminum Oxide Powder

ABSTRACT
This specification covers aluminum oxide (alumina) powder in two classes of particle size, two chemical grades, and two levels of acidity. Aluminum oxide powder shall conform to the chemical composition requirements indicated in this specification. The alumina powder shall be tested for water-soluble content, particle size, and hydrogen-ion concentration according to the procedures in this specification.
SCOPE
1.1 This specification covers aluminum oxide (alumina) powder in two classes of particle size, two chemical grades, and two levels of acidity, for use as an insulating coating or as an ingredient of ceramic mixtures for components of electronic devices as follows:
1.1.1 Particle Sizes:  
1.1.1.1 Class AParticle size No. 500 nominal mesh (nominal average particle size = 24.3 μm).  
1.1.1.2 Class BParticle size No. 900 nominal mesh (nominal average particle size = 1.7 μm).  
1.1.2 Chemical GradesGrades 1 and 2 as specified under chemical requirements in Section 3.  
1.1.3 Acidity Levels: pH (acid) 4.5 to 6.5 and pH (neutral) 6.5 to 7.5.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 The following safety hazards caveat pertains only to the test methods in this specification.  This standard does not purport to address all of the safety concerns, 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: 31-May-2011
• ICS: 71.060.20 - Oxides
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.03 - Metallic Materials, Wire Bonding, and Flip Chip

Relations

• Replaces: ASTM F7-95(2006) - Standard Specification for Aluminum Oxide Powder
• Effective Date: 01-Jun-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:F7 −95(Reapproved 2011)
Standard Specification for
Aluminum Oxide Powder
This standard is issued under the fixed designation F7; the number immediately following the designation indicates the year of original
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Chemical Composition
1.1 This specification covers aluminum oxide (alumina) 3.1 For a specified particle size and level of acidity, the
aluminum oxide shall conform to the requirements of Table 1
powder in two classes of particle size, two chemical grades,
as to chemical composition.
and two levels of acidity, for use as an insulating coating or as
aningredientofceramicmixturesforcomponentsofelectronic
4. Physical Properties
devices as follows:
1.1.1 Particle Sizes:
4.1 The alumina shall be “chalk white,” dry, free from
1.1.1.1 Class A—Particle size No. 500 nominal mesh
lumps,andofparticlesizedistributionasagreeduponbetween
(nominal average particle size=24.3 µm). purchaser and seller.
1.1.1.2 Class B—Particle size No. 900 nominal mesh
5. Sampling
(nominal average particle size=1.7 µm).
1.1.2 Chemical Grades—Grades 1 and 2 as specified under
5.1 Each lot of alumina shall be properly sampled in
chemical requirements in Section 3.
accordance with standard techniques, such as Practice C183.
1.1.3 Acidity Levels: pH (acid) 4.5 to 6.5 and pH (neutral)
6. Test Methods
6.5 to 7.5.
6.1 Water-Soluble Content:
1.2 The values stated in SI units are to be regarded as
6.1.1 Procedure—Determine the total water-soluble content
standard. No other units of measurement are included in this
by measuring the electrical conductivity of a 100-mL distilled
standard.
or deionized water extract from a 5-g sample of alumina.
1.3 The following safety hazards caveat pertains only to the
Elutriate by vigorously shaking the alumina suspension in a
test methods in this specification. This standard does not
flask for 1 to 2 min, allowing the solids to settle and decanting
purport to address all of the safety concerns, if any, associated
the clear supernatant liquid after 60 min. Measure the conduc-
with its use. It is the responsibility of the user of this standard
tivity of the liquid with a standard cell and bridge. Correct this
to establish appropriate safety and health practices and
measurement for the “blank” reading on a similarly treated
determine the applicability of regulatory limitations prior to
equal volume of the same pure water. Convert the net increase
use.
in conductivity of the water extract first to parts of water-
soluble content as sodium chloride (NaCl) per million parts of
2. Referenced Documents
water(factoris1micromho=0.5ppmNaCl),thenrelatetothe
2.1 ASTM Standards:
actual weight of elutriated alumina. For example, on a typical
C183Practice for Sampling and the Amount of Testing of
100-mL extract 10 micromhos (net) or 5 parts of NaCl per
Hydraulic Cement
million of water in this volume of liquid is equivalent to 100
E70Test Method for pH of Aqueous Solutions With the
parts of NaCl per million of alumina on the basis of a 5-g
Glass Electrode
sample.
6.1.2 Calculation— Determine the parts per million of
water-soluble content as follows:
1 7
This specification is under the jurisdiction of ASTM Committee F01 on
ppm 5 10 K R 2 R /R R (1)
@~ ! #
c b x b x
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
Materials.
where:
Current edition approved June 1, 2011. Published June 2011. Originally
−1
K = cell constant, cm ,
c
approved in 1958. Last previous edition approved in 2006 as F7–95(2006). DOI:
R = specific resistance of test water,Ω·cm, and
10.1520/F0007-95R11. b
For referenced ASTM standards, visit the ASTM website, www.astm.org, or R = specific resistance of alumina extract in test water,
x
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Ω·cm.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 6.2 Particle Size:
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F7−95 (2011)
TABLE 1 Chemical Requirements
6.2.4 Particlesizedistributionofacceptablematerialinboth
Composition, % Class A and Class B will be by agreement between purchaser
Element or Compound
Grade 1 Grade 2 and seller. Sample size and method of dispersion will be
Alumina (
...