GOST 28595-90

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  ГОСТ 28595-90

GOST 28595−90 Silver bullion. Specifications (with Amendments No. 1, 2)

GOST 28595−90

Group W51

INTERSTATE STANDARD

SILVER BULLION

Specifications

Silver in ingots.
Specifications

GST 17 5221

Date of introduction 1992−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED the Main Directorate of precious metals and diamonds at the Council of Ministers of the USSR

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee on management of quality and standards from 27.06.90 N 1919

The change in N 1 taken by the Interstate Council for standardization, Metrology and certification (Protocol No. 14 dated 12.11.98)

Was the Technical Secretariat of MGS N 3140

The adoption of the changes voted:

3. INSTEAD OF OST 48−78−83

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

(Changed edition, Rev. N 2).

5. Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)

6. EDITION with Change No. 1, approved in April 1999 (IUS 6−99)

The Change No. 2 adopted by the Interstate Council for standardization, Metrology and certification (Protocol No. 30 dated 07.12.2006). The state developed by Russia. By the order of Rosstandart dated 15.02.2007 13 N-St introduced on the territory of the Russian Federation from 01.01.2008

Change No. 2 made by the manufacturer of the database in the text IUS N 5, 2007


This standard applies to refined silver bullion, manufactured for the needs of the national economy and exports.

1. TECHNICAL REQUIREMENTS

1.1. Silver bullion is produced in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

1.2. Basic parameters and dimensions

1.2.1. The silver bullion must be in the form of a truncated pyramid with dimensions, mm:

335±5 — the length of the large base;

135±5 — width of the large base;

300±5 the length of the smaller base;

100±5 — width of the smaller base;

80±2 — height.

By agreement with the consumer it is allowed manufacture of ingots of different shapes and sizes.

Example of symbols of refined silver bullion stamps SRA-1:

Silver SRA-1 GOST 28595−90

(Changed edition, Rev. N 1).

1.3. Features

1.3.1. Silver bullion brands produce CPA-1, CPA-2, CPA-3.

(Changed edition, Rev. N 1).

1.3.2. The chemical composition of the silver bullion shall be as given in table 1.

Table 1

Continued

Notes:

1. The sign «-" means that the impurity is defined, but not regulated.

2. The column «Total» includes the total of all the designated impurities.

3. Mass fraction of silver is determined by the difference between 100% and sum of impurities listed in the table.


(Changed edition, Rev. N 1, 2).

1.3.3. Silver bullion produce weight from 28000,0 to 32000,0 G.

In coordination with the consumer the bars can be made of the other mass.

(Changed edition, Rev. N 1).

1.3.4. The surface of the ingots must be free of burrs, burrs, scratches, nicks, grease and oil stains, and other extraneous non-metallic inclusions.

Allowed denuded areas on the surface of the ingot to a depth of not more than 3 mm and the concavity of the shrinkage of the metal to a depth of not more than 9 mm.

(Changed edition, Rev. N 2).

1.4. Marking

1.4.1. On the large base of each ingot should be stamped:

number (code) of the ingot;

— the symbolism of the state of manufacture;

— trademark of the manufacturer;

— Marc silver;

— mass fraction of silver, %;

— weight of ingot, g;

— the year of issue.

Prints numbers and other details of marking should be clear.

(Changed edition, Rev. N 1).

1.5. Packaging

Silver bars are packaged in containers or in boxes according to normative-technical documentation. Containers or boxes sealed.

Allowed to use a different kind of packaging, ensuring the safety bars.

1.5.2. For each container or box and label with the number of specifications and numbers.

2. ACCEPTANCE

2.1. The silver bullion accepted by the parties. The weight of the batch is not more than 550 kg. the Party should consist of a metal of the same brand and the same bottoms and decorated with a single document about quality that contains:

— trademark or name of the manufacturer and trademark;

— Marc silver;

— the batch number;

— number of ingots;

— mass fraction of silver, %;

— mass fraction of each impurity, %;

room specifications;

the year of manufacture,

and specification, containing:

— the name of the manufacturer;

— Marc silver;

— number of ingots;

the mass of each ingot, g;

— mass fraction of silver in each bar, %;

the weight of each silver ingot, g;

the total mass of the silver specification, g;

— the batch number;

room specifications;

— the designation of the standard;

the year of manufacture.

2.2. Control of surface quality, marking and the mass is subjected to every ingot.

2.3. Manufacturer to determine the chemical composition takes samples from the molten metal in the middle of the spill, a party of silver bullion.

User to check the chemical composition takes samples from 10% of the ingots from the party, but not less than two ingots.

If unsatisfactory results of the analysis of the chemical composition of at least one of the indicators, repeat tests are carried out at twice the number of samples taken from the same batch. The results of repeated tests spread to the entire party.

3. CONTROL METHODS

3.1. The chemical composition of silver bullion is determined according to GOST 28353.0 — GOST 28353.3.

Allowed the use of other methods of analysis, precision not inferior to that specified in the 28353.0 GOST — GOST 28353.3.

The consumer to determine the chemical composition of the selected sample by drilling a carbide drill with a diameter of not less than 6 mm from two opposite corners and sides of the ingot to a depth of half the thickness of the ingot. The sample mass not exceeding 25 g.

If there is disagreement in the assessment of the chemical composition analysis is carried out according to GOST 28353.0 — GOST 28353.3.

(Changed edition, Rev. N 1).

3.2. The mass of ingots checked on a laboratory balance high precision class according to GOST 24104.

(Changed edition, Rev. N 2).

3.3. Control of surface quality and marking of ingots is carried out without the use of magnifying devices.

3.4. Shelf life of samples — at least three months from the date of dispatch of the samples.

(Changed edition, Rev. N 2).

4. TRANSPORTATION AND STORAGE

4.1. Transportation and storage of silver is carried out in accordance with the procedure of transportation and storage, approved by the relevant Department of the state of the manufacturer.

(Changed edition, Rev. N 1).