ASTM B413-97a

Standard Specification for Refined Silver

SCOPE
1.1 This specification covers refined silver in cast bar form in three grades as follows:  
1.1.1 Grade 99.90 (UNS P07020)-Silver having a minimum fineness of 999.0 commonly referred to as "commercial bar" or "bullion."  
1.1.2 Grade 99.95 (UNS P07015)-Silver having a minimum fineness of 999.5.  
1.1.3 Grade 99.99 (UNS P07010)-A premium grade having a minimum fineness of 999.9.  
1.2 The values stated in inch-pound units are to be regarded as the standard.

General Information

• Status: Historical
• Publication Date: 09-Apr-1997
• ICS: 77.120.99 - Other non-ferrous metals and their alloys
• Technical Committee: B02 - Nonferrous Metals and Alloys
• Drafting Committee: B02.05 - Precious Metals and Electrical Contact Materials and Test Methods

Relations

• Replaced By: ASTM B413-97a(2003) - Standard Specification for Refined Silver
• Effective Date: 01-Nov-2003

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 413 – 97a
Standard Specification for
Refined Silver
This standard is issued under the fixed designation B 413; 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.
TABLE 1 Chemical Requirements
1. Scope
1.1 This specification covers refined silver cast bar form in NOTE 1—The following applies to all specified limits in this table: For
purposes of determining conformance with this specification, an observed
three grades as follows:
value obtained from analysis shall be rounded off “to the nearest unit” in
1.1.1 Grade 99.90 (UNS P07020)—Silver having a mini-
the last right-hand place of figures used in expressing the limiting value,
mum fineness of 999.0 commonly referred to as “commercial
in accordance with the rounding-off method of Practice E 29.
bar” or“ bullion.”
Composition, %
1.1.2 Grade 99.95 (UNS P07015)—Silver having a mini-
Grade Grade Grade
mum fineness of 999.5.
A,B
Element
99.90 99.95 99.99
1.1.3 Grade 99.99 (UNS P07010)—A premium grade hav-
(UNS (UNS (UNS
ing a minimum fineness of 999.9. P07020) P07015) P07010)
1.2 The values stated in inch-pound units are to be regarded
Silver, min 99.90 99.95 99.99
Silver and copper, min 99.95 . .
as the standard.
Bismuth, max 0.001 0.001 0.0005
Copper, max 0.08 0.04 0.010
2. Referenced Documents
Iron, max 0.002 0.002 0.001
Lead, max 0.025 0.015 0.001
2.1 ASTM Standards:
Palladium, max . . 0.001
E 29 Practice for Using Significant Digits in Test Data to
Selenium, max . . 0.0005
Determine Conformance with Specifications
Tellurium, max . . 0.0005
E 378 Test Method for Spectrographic Analysis of Silver by A
Impurities other than those listed above may be included by special agreement
between purchaser and manufacturer.
the Powder Technique
B
In this specification, it is to be noted that while oxygen is neither specified nor
determined analytically, it is known to be present in the refined silver. When
3. Materials and Manufacture
calculating the purity of refined silver by difference, oxygen will be considered as
silver.
3.1 The silver shall be produced by any process that yields
a product capable of meeting the requirements of this specifi-
cation.
6. Method of Analysis
3.2 The bars shall be of a quality generally acceptable to the
6.1 The composition of the bars or samples shall be deter-
trade.
mined by any destructive or nondestructive method agreed
3.3 The manufacturer shall use care to have each shipment
upon between the manufacturer and the purchaser. Unless
of as uniform quality as possible.
otherwise specifically agreed, chemical methods will be used
4. Chemical Composition
for analysis. The chemical composition of the materials set
forth in this specification shall be determined, in case of
4.1 The refined silver shall conform to the chemical com-
disagreement, in accordance with Test Method E 378. The
position prescribed in Table 1.
selection of methods for the determination of elements not
5. Lots
covered by that test method shall be a matter of agreement
between the manufacturer and the purchaser.
5.1 A single melt shall constitute a lot for sampling.
7. Sampling
7.1 The value of this material is such that special attention
This specification is under the jurisdiction of ASTM Committee B-2 on
must be paid to sampling procedures. If the purchaser and the
Nonferrous Metals and Alloysand is the direct responsibility of Subcommittee
manufacturer agree that samples most representative of the
B02.05on Precious Metals.
assay value of a melt are required, the samples should be taken
Current edition approved Apr. 10, 1997. Published February 1998. Originally
published as B413 – 64. Replaces B413 – 67 T. Last previous edition B 413 – 97.
from the silver melt as it is ready for pouring into molds. The
Other forms of unfabricated silver of commerce are not to be excluded under
samples should consist of shot or cast pins.
this specification.
3 7.2 On agreement between manufacturer and purchaser, an
Annual Book of ASTM Standards, Vol 14.02.
Annual Book of ASTM Standards, Vol 03.06. alternative sampling procedure may be used.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 413
7.3 The amount of sample taken shall be sufficient to supply 9.2 Where the silver satisfies the requirements of this
three portions for analysis; the mass of each portion shall be specification, it shall not be condemned for defects in the
sufficient to permit the determination of its composition as set products in which it is used.
forth in Table 1.
10. Investigation of Claims
7.4 Af
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