ASTM B413-97a(2021)
Standard Specification for Refined Silver
- Standard No.
- ASTM B413-97a(2021)
- Release Date
- 2021
- Published By
- American Society for Testing and Materials (ASTM) US / ASTM
- Latest
- ASTM B413-97a(2021)
- Introduction
Standard Overview and Technological Evolution
ASTM B413-97a(2021) is a specification standard for refined silver ingots developed by the American Society for Testing and Materials. It was originally published in 1964 and was last revised in 2021. 7015
Grade 99.99 999.0‰ Commercial Silver Ingot P07020 Grade 99.95 999.5‰ - P07015 Grade 99.99 999.9‰ High-purity Silver Ingots P07010
Core Requirements for Chemical Composition
The standard strictly stipulates the upper limit of impurity content for each grade of silver ingot through Table 1, and adopts the "silver + copper" combination index to ensure material performance:
Key Indicator Comparison
- Grade 99.99 has a lead (Pb) limit of 0.001%, which is 25 times stricter than the industrial grade
- Bismuth (Bi) content must be tested for all grades, and the high-purity grade requirement is ≤0.0005%
- Copper (Cu) content decreases from 0.08% to 0.01% as the grade increases
Test methods and sampling specifications
The standard recommends the use of E378 spectral analysis method and stipulates a strict sampling process:
Links Technical requirements Commercial significance Sampling time Sampling before melt pouring Ensure that the sample represents the quality of the entire batch Sample form Silver particles or casting nails Avoid component segregation Sampling requirements Sealed and stored in three equal parts Guarantee the basis for re-inspection in case of disputes
Implementation Recommendations and Precautions
- Marking Requirements: Each silver ingot must be marked with the manufacturer's logo, smelting number, and weight (accurate to 0.1 troy ounce).
- Dispute Resolution: Written claims must be submitted within 30 days of receipt, and original samples must be retained for review.
- Safety Tips: Refer to the manufacturer's SDS and establish appropriate safety and environmental measures.
Application Scenario Analysis
In the electronics industry, Grade 99.99 silver ingots are the preferred raw material for precision contact materials due to their extremely low selenium (Se) and tellurium (Te) content (both ≤ 0.0005%). Grade 99.90 silver is widely used in jewelry processing and investment silver bars.
ASTM B413-97a(2021) Referenced Document
- ASTM E29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
- ASTM E378 Silver powder technical spectrum analysis test method
ASTM B413-97a(2021) history
- 2021 ASTM B413-97a(2021) Standard Specification for Refined Silver
- 1997 ASTM B413-97a(2017) Standard Specification for Refined Silver
- 1997 ASTM B413-97a(2012) Standard Specification for Refined Silver
- 1997 ASTM B413-97a(2008) Standard Specification for Refined Silver
- 1997 ASTM B413-97a(2003) Standard Specification for Refined Silver
- 1997 ASTM B413-97a Standard Specification for Refined Silver
