ASTM F7-95(2000)

Standard Specification for Aluminum Oxide Powder

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:Class A--Particle size No. 500 nominal mesh (nominal average particle size = 24.3 µm).
Class B--Particle size No. 900 nominal mesh (nominal average particle size = 1.7 µm).
1.1.2 Chemical Grades--Grades 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 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-Dec-1999
• ICS: 71.060.20 - Oxides
• Technical Committee: F01 - Electronics
• Drafting Committee: F01.03 - Metallic Materials, Wire Bonding, and Flip Chip

Relations

• Replaced By: ASTM F7-95(2006) - Standard Specification for Aluminum Oxide Powder
• Effective Date: 01-Jan-2006

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: F 7 – 95 (Reapproved 2000)
Standard Specification for
Aluminum Oxide Powder
This standard is issued under the fixed designation F 7; the number immediately following the designation indicates the year of original
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
TABLE 1 Chemical Requirements
1. Scope
Composition, %
1.1 This specification covers aluminum oxide (alumina)
Element or Compound
Grade 1 Grade 2
powder in two classes of particle size, two chemical grades,
and two levels of acidity, for use as an insulating coating or as
Alumina (Al O ), min 99.65 99.65
2 3
Silica (SiO ), max 0.03 0.12
aningredientofceramicmixturesforcomponentsofelectronic
Magnesia (MgO), max 0.02 0.01
devices as follows:
Ferric oxide (Fe O ), max 0.04 0.04
2 3
1.1.1 Particle Sizes: Total alkali (as Na O), max 0.04 0.04
Carbon (C), max 0.01 0.01
1.1.1.1 Class A—Particle size No. 500 nominal mesh
Calcium oxide (CaO), max 0.02 0.01
(nominal average particle size=24.3 µm).
Zirconium oxide (ZrO ), max 0.01 0.01
1.1.1.2 Class B—Particle size No. 900 nominal mesh Boron (B), max 0.001 0.002
Gallium oxide (Ga O ), max 0.3
2 3
(nominal average particle size=1.7 µm).
No other single metallic impurity 0.02 0.02
1.1.2 Chemical Grades—Grades 1 and 2 as specified under
to exceed
Composition, ppm
chemical requirements in Section 3.
Water-soluble matter (as NaCl), max 300 300
1.1.3 Acidity Levels: pH (acid) 4.5 to 6.5 and pH (neutral)
6.5 to 7.5.
1.2 The following safety hazards caveat pertains only to the
4. Physical Properties
test methods in this specification. This standard does not
purport to address all of the safety concerns, if any, associated
4.1 The alumina shall be “chalk white,” dry, free from
with its use. It is the responsibility of the user of this standard
lumps,andofparticlesizedistributionasagreeduponbetween
to establish appropriate safety and health practices and
purchaser and seller.
determine the applicability of regulatory limitations prior to
5. Sampling
use.
5.1 Each lot of alumina shall be properly sampled in
2. Referenced Documents
accordance with standard techniques, such as Practice C183.
2.1 ASTM Standards:
6. Test Methods
C183 Practice for Sampling and the Amount of Testing of
Hydraulic Cement
6.1 Water-Soluble Content:
E70 Test Method for pH of Aqueous Solutions with the
6.1.1 Procedure—Determinethetotalwater-solublecontent
Glass Electrode
by measuring the electrical conductivity of a 100-mL distilled
or deionized water extract from a 5-g sample of alumina.
3. Chemical Composition
Elutriate by vigorously shaking the alumina suspension in a
3.1 For a specified particle size and level of acidity, the
flask for 1 to 2 min, allowing the solids to settle and decanting
aluminum oxide shall conform to the requirements of Table 1
the clear supernatant liquid after 60 min. Measure the conduc-
as to chemical composition.
tivity of the liquid with a standard cell and bridge. Correct this
measurement for the “blank” reading on a similarly treated
equal volume of the same pure water. Convert the net increase
This specification is under the jurisdiction of ASTM Committee F1 on
in conductivity of the water extract first to parts of water-
Electronics and is the direct responsibility of Subcommittee F01.03 on Metallic
Materials.
soluble content as sodium chloride (NaCl) per million parts of
Current edition approved Nov. 10, 1995. Published January 1996. Originally
water(factoris1micromho=0.5ppmNaCl),thenrelatetothe
published asF7–58T. Last previous editionF7–70(1991).
2 actual weight of elutriated alumina. For example, on a typical
Annual Book of ASTM Standards, Vol 04.01.
Annual Book of ASTM Standards, Vol 15.05. 100-mL extract 10 micromhos (net) or 5 parts of NaCl per
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F 7 – 95 (2000)
TABLE 2 Requirements for Sample Sizes and Dispersing Agents
Sample
Sample Dispersing
Method Concentration Dispersing Agent
Size, g Medium
Weight%
A
Coulter counter 0.25 0.1 methanol LiCl-38g/gal
M.S.A. centrifuge 1.0 0.03 HON
...