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5. REPUBLICATION. October 2002

This standard applies to gypsum binders obtained by heat treatment gypsum raw materials to calcium sulfate hemihydrate and used for the manufacture building products all types and production construction works, as well as for the manufacture of molds and models in porcelain, ceramic and other industries.

The standard complies with the requirements of ST SEV 826-77 in the part specified in Appendix 2.

Requirements for medical plaster must be established by the relevant regulatory and technical document developed on the basis of ST SEV 826-77.

1. TECHNICAL REQUIREMENTS

1. TECHNICAL REQUIREMENTS

1.1. Binders shall be manufactured in accordance with the requirements of this International Standard. technological regulations, approved in the manner prescribed by the ministry-manufacturer.

1.2. Gypsum stone is used for the production of binders. GOST 4013 or phosphogypsum according to the current regulatory and technical documentation.

1.3. Depending on the compressive strength, the following grades of gypsum binders are distinguished: G-2, G-3, G-4, G-5, G-6, G-7, G-10, G-13, G-16, G -19, G-22, G-25.

The minimum tensile strength of each brand of binder must correspond to the values ​​given in Table 1.

Table 1

1.4. Depending on the setting time, binders of the types listed in Table 2 are distinguished.

table 2

1.5. For the porcelain-faience and ceramic industries, binders are made with setting times set for normally hardening gypsum.

1.6. Depending on the degree of grinding, binders of the types listed in Table 3 are distinguished.

Table 3

1.7. For the porcelain-faience and ceramic industries, finely ground binders are produced with a maximum residue on a sieve with a clear mesh size of 0.2 mm, not more than 1%.

1.8. The manufacturer must determine the specific surface area of ​​the fine grinding binder at least once a month and indicate its value in a document of the established form.

1.9. Binders used in porcelain, faience, ceramic and other industries must meet the additional requirements specified in Table 4.

Table 4

1.10. Astringents the highest category qualities must meet the additional requirements specified in Table 5.

Table 5

Example symbol gypsum binder with a strength of 5.2 MPa (52 kgf / cm) with a setting time: start - 5 minutes, end - 9 minutes and residue on a sieve with a mesh size in the light of 0.2 mm 9%, i.e. binder brand G-5, fast-hardening, medium grinding:

G-5 A II

Note. Possible areas of application of binders are indicated in Appendix 1.

2. ACCEPTANCE RULES AND TEST METHODS

________________
* Acceptance rules - according to GOST 26871.

2.1. The supply and acceptance of the binder is carried out in batches. A batch is considered to be a binder of one type and one brand.

The batch size is set depending on the annual capacity of the enterprise in the following quantity:

Up to 200 tons - with an annual capacity of St. 150 thousand tons;

- up to 65 tons - with an annual capacity of up to 150 thousand tons.

When a binder is shipped in courts, the batch size is established by agreement of the parties.

2.2. The manufacturer must guarantee and confirm with a document of the established form the compliance of the properties of the binder with the requirements of this standard based on the results of current tests.

2.3. The consumer has the right to conduct a control check of the compliance of the properties of the binder with the requirements of this standard, while applying the sampling procedure and test methods according to GOST 23789.

If it is found that the bending or compressive strength of the binder does not match the grade specified in the relevant document, it must be changed in accordance with the actual strength.

2.4. Sampling and test methods for binders are carried out according to GOST 23789.

3. PACKAGING, LABELING, TRANSPORT AND STORAGE

________________
* Packing, marking, transportation and storage - according to GOST 26871.

3.1. Binders are shipped without packaging or packed in bags according to GOST 2226 and other container.

3.2. Binders used for the porcelain-faience and ceramic industry, as well as for special purposes, should be shipped only packed in bags according to GOST 2226.

3.3 The manufacturer must accompany each shipped batch with a document of the established form, which indicates:

- name of the organization in whose subordination the manufacturer is located;

- name and address of the manufacturer;

- batch number and date of issue of the document;

Lot weight and date of shipment;

- name and address of the recipient;

- the designation of the binder according to clause 1.10 and the results of physical and mechanical tests;

- specific surface area for fine grinding binder;

- designation of this standard.

3.4. During transportation and storage, binders must be protected from moisture and contamination.

4. MANUFACTURER WARRANTY

4.1. The manufacturer must ensure that the properties of gypsum binders comply with the requirements of this standard, subject to the conditions of transportation and storage.

Guaranteed shelf life of binders - 2 months from the date of manufacture.

APPENDIX 1 (informative). FIELD OF APPLICATION OF GYPSUM BINDERS

APPENDIX 1
Reference

APPENDIX 2 (informative). INFORMATION DATA ON COMPLIANCE WITH GOST 125-79 ST SEV 826-77

APPENDIX 2
Reference

INFORMATION DATA ON COMPLIANCE WITH THIS STANDARD ST SEV 826-77

Electronic text of the document
prepared by Kodeks JSC and verified against:
official publication
Moscow: IPK Standards Publishing House, 2002

Group G12

INTERSTATE STANDARD

BINDING GYPSUM

Specifications

Gypsum binders. Specifications

The text of Comparison of GOST 125-79 with GOST 125-2018, see the link.
- .
____________________________________________________________________

OKP 57 4431

Introduction date 1980-07-01

INFORMATION DATA

1. DESIGNED AND INTRODUCED by the Ministry industry building materials the USSR

2. APPROVED AND INTRODUCED BY Decree State Committee USSR on construction matters dated 19.07.79 N 123.

3. INSTEAD OF GOST 125-70, GOST 5.1845-73

4. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

5. REPUBLICATION. October 2002

This standard applies to gypsum binders obtained by heat treatment of gypsum raw materials to calcium sulfate hemihydrate and used for the manufacture of building products of all types and in the production of construction works, as well as for the manufacture of molds and models in porcelain, faience, ceramic and other industries.

The standard complies with the requirements of ST SEV 826-77 in the part specified in Appendix 2.

Requirements for medical plaster must be established by the relevant regulatory and technical document developed on the basis of ST SEV 826-77.

1. TECHNICAL REQUIREMENTS

1. TECHNICAL REQUIREMENTS

1.1. Binders must be manufactured in accordance with the requirements of this standard according to technological regulations approved in the manner prescribed by the manufacturer's ministry.

1.2. For the production of binders, gypsum stone is used according to GOST 4013 or phosphogypsum according to the current regulatory and technical documentation.

1.3. Depending on the compressive strength, the following grades of gypsum binders are distinguished: G-2, G-3, G-4, G-5, G-6, G-7, G-10, G-13, G-16, G -19, G-22, G-25.

The minimum tensile strength of each brand of binder must correspond to the values ​​given in Table 1.

Table 1

1.4. Depending on the setting time, binders of the types listed in Table 2 are distinguished.

table 2

1.5. For the porcelain-faience and ceramic industries, binders are made with setting times set for normally hardening gypsum.

1.6. Depending on the degree of grinding, binders of the types listed in Table 3 are distinguished.

Table 3

1.7. For the porcelain-faience and ceramic industries, finely ground binders are produced with a maximum residue on a sieve with a clear mesh size of 0.2 mm, not more than 1%.

1.8. The manufacturer must determine the specific surface area of ​​the fine grinding binder at least once a month and indicate its value in a document of the established form.

1.9. Binders used in porcelain, faience, ceramic and other industries must meet the additional requirements specified in Table 4.

Table 4

1.10. Binders of the highest quality category must meet the additional requirements specified in Table 5.

Table 5

An example of a conventional designation of a gypsum binder with a strength of 5.2 MPa (52 kgf / cm) with a setting time: start - 5 minutes, end - 9 minutes and a residue on a sieve with a clear mesh size of 0.2 mm 9%, i.e. binder brand G-5, fast-hardening, medium grinding:

G-5 A II

Note. Possible areas of application of binders are indicated in Appendix 1.

2. ACCEPTANCE RULES AND TEST METHODS

________________
* Acceptance rules - according to GOST 26871.

2.1. The supply and acceptance of the binder is carried out in batches. A batch is considered to be a binder of one type and one brand.

The batch size is set depending on the annual capacity of the enterprise in the following quantity:

Up to 200 tons - with an annual capacity of St. 150 thousand tons;

Up to 65 tons - with an annual capacity of up to 150 thousand tons.

When a binder is shipped in courts, the batch size is established by agreement of the parties.

2.2. The manufacturer must guarantee and confirm with a document of the established form the compliance of the properties of the binder with the requirements of this standard based on the results of current tests.

2.3. The consumer has the right to perform a control check of the compliance of the properties of the binder with the requirements of this standard, while applying the sampling procedure and test methods in accordance with GOST 23789.

If it is found that the bending or compressive strength of the binder does not match the grade specified in the relevant document, it must be changed in accordance with the actual strength.

2.4. Sampling and test methods for binders are carried out in accordance with GOST 23789.

3. PACKAGING, LABELING, TRANSPORT AND STORAGE

________________
* Packing, marking, transportation and storage - in accordance with GOST 26871.

3.1. Binders are shipped without packaging or packed in bags according to GOST 2226 and other containers.

3.2. Binders used for the porcelain-faience and ceramic industries, as well as for special purposes, should only be shipped packed in bags in accordance with GOST 2226.

3.3 The manufacturer must accompany each shipped batch with a document of the established form, which indicates:

Name of the organization in whose subordination the manufacturer is located;

Name and address of the manufacturer;

Batch number and date of issue of the document;

Lot weight and date of shipment;

Name and address of the recipient;

The designation of the binder according to clause 1.10 and the results of physical and mechanical tests;

Specific surface area for fine grinding binder;

Designation of this standard.

3.4. During transportation and storage, binders must be protected from moisture and contamination.

4. MANUFACTURER WARRANTY

4.1. The manufacturer must ensure that the properties of gypsum binders comply with the requirements of this standard, subject to the conditions of transportation and storage.

Guaranteed shelf life of binders - 2 months from the date of manufacture.

APPENDIX 1 (informative). FIELD OF APPLICATION OF GYPSUM BINDERS

APPENDIX 1
Reference

APPENDIX 2 (informative). INFORMATION DATA ON COMPLIANCE WITH GOST 125-79 ST SEV 826-77

APPENDIX 2
Reference

INFORMATION DATA ON COMPLIANCE WITH THIS STANDARD ST SEV 826-77

Electronic text of the document
and verified by:
official publication
Moscow: IPK Standards Publishing House, 2002