ASTM E194-99

Standard Test Method for Acid-Insoluble Content of Copper and Iron Powders

SCOPE
1.1 This test method  covers the determination of the mineral-acid-insoluble matter content of copper and iron powders in amounts under 1.0%.  
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-Sep-1999
• ICS: 77.160 - Powder metallurgy
• Technical Committee: B09 - Metal Powders and Metal Powder Products
• Drafting Committee: B09.02 - Base Metal Powders

Relations

• Replaced By: ASTM E194-06 - Standard Test Method for Acid-Insoluble Content of Copper and Iron Powders
• Effective Date: 01-Oct-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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: E 194 – 99
Standard Test Method for
Acid-Insoluble Content of Copper and Iron Powders
This standard is issued under the fixed designation E 194; 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 dissolve the metal. In copper powder, which is treated with
2 nitric acid, the acid-insoluble matter includes silica, insoluble
1.1 This test method covers the determination of the
silicates, alumina, clays, and other refractory materials that
mineral-acid-insoluble matter content of copper and iron pow-
may be introduced either as impurities in the raw material or
ders in amounts under 1.0 %.
from the furnace lining, fuel, etc.; lead sulfate may also be
1.2 This standard does not purport to address all of the
present. In iron powder, which is treated with hydrochloric
safety problems, if any, associated with its use. It is the
acid, the insoluble matter may include carbides in addition to
responsibility of the user of this standard to establish appro-
thesubstanceslistedabove.Thetestmethodexcludesinsoluble
priate safety and health practices and determine the applica-
material that is volatile at the ignition temperature specified.
bility of regulatory limitations prior to use.
5. Interferences
2. Referenced Documents
5.1 Any metallic tin present in the copper powder will be
2.1 ASTM Standards:
converted into the insoluble tin oxide by the nitric acid
B 215 Practices for Sampling Finished Lots of Metal Pow-
treatment; in such cases, provision shall be made for the
ders
determination of tin oxide and the appropriate correction
E 50 Practices for Apparatus, Reagents, and Safety Precau-
applied.
tions for Chemical Analysis of Metals
E 691 Practice for Conducting an Interlaboratory Study to
6. Apparatus
Determine the Precision of a Test Method
6.1 Apparatus and reagents shall conform to the require-
3. Summary of Test Method ments prescribed in Practices E 50.
6.2 Casseroles, 250 mL and 750 mL.
3.1 The sample is dissolved in the appropriate acid (nitric
6.3 Filter Paper, Whatman No. 541 or one of equivalent
acid(HNO )forcopper,hydrochloricacid(HCl)foriron).The
pore size and ash content.
insolublematterisfilteredoutandignitedinafurnaceat980°C
for1h.
7. Reagents
4. Significance and Use 7.1 Ammonium Iodide (NH I).
4.1 The purpose of this test method is to determine the
8. Sampling
amount of gangue, refractory, inert, etc., materials, that may
8.1 The metal powder shall be sampled in accordance with
adversely affect compacting tools and sintered properties of
Practices B 215.
components formed from copper and iron powders.
8.2 Store the test sample in a tightly stoppered bottle to
4.2 The insoluble matter consists of those nonmetallic
protect it from moisture which promotes oxidation of copper
substances that do not dissolve in the mineral acid used to
and iron.
1 COPPER POWDER
This test method is under the jurisdiction of ASTM Committee B-9 on Metal
Powders and Metal Powder Productsand is the direct responsibility of Subcommit-
9. Procedure
tee B09.02on Base Metal Powders.
Current edition approved September 10, 1999. Published October 1999. Origi-
9.1 Transfer5gofthe sample, weighed to the nearest 1 mg,
nally published as E 194 – 62 T. Last previous edition E 194 – 98.
2 to a 250-mL covered casserole. Add 100 mL of HNO (1+1)
Based on the method developed by the Metal Powder Association (now the
Metal Powder Producers Association of the Metal Powder Industries Federation) and let stand at room temperature until the reaction is com-
and described in MPI Standard 6-54, “Determination of Acid Insoluble Matter in
plete. Place the casserole on a hot plate and boil until the
Iron and Copper Powders,” which is a standard of the MPIF.
volume is reduced to 50 mL. Cool, dilute with water to about
Annual Book of ASTM Standards, Vol 02.05.
Annual Book of ASTM Standards, Vol 03.05.
Annual Book of ASTM Standards, Vol 14.02.
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E 194
100 mL, and bring to a boil. Filter, and wash with hot water Insoluble matter, percent 5 @A/B# 3 100
until all traces of blue color disappear.
9.2 Transfer paper and precipitate to a porcelain crucible,
where:
weighed to the nearest 0.1 mg. Dry, and then ignite in a furnace
A 5 insoluble matter, g, and
at 980°C for 1 h. Cool in a
...