What is the national standard for compressive strength of pellets?

The compressive strength of particles is determined according to customer's requirements. The inspection method of the International Organization for Standardization (ISO 4700- 1983) is to put a small ball between two platens of a press and apply a load until it breaks. One platen is fixed and the other platen can move vertically. The upper and lower platens must be parallel to each other, and the surface of the platens must be flat. The surface of the plate in contact with the sample must be made of hardened steel. The load capacity of the press used should be greater than 10kN. Before the test, the particles were dried in an oven at 65438 005℃ and then cooled to room temperature. Choose a small ball with a diameter of 10.0 ~ 12.5 mm as the sample. 60 or more samples should be made for each test. During the test, the platen was pressurized at a constant speed of 10 ~ 20 mm/min.

Legal basis:

People's Republic of China (PRC) standardization method

Article 10 Compulsory national standards shall be formulated for the technical requirements for safeguarding personal health and life and property safety, national security, ecological environment safety and meeting the basic needs of economic and social management.

The relevant administrative departments in the State Council are responsible for proposing, organizing drafting, soliciting opinions and technical review of mandatory national standards in accordance with their duties. The State Council standardization administrative department is responsible for the formulation, numbering and external notification of mandatory national standards. The administrative department in charge of standardization in the State Council shall examine whether the mandatory national standards to be formulated conform to the provisions of the preceding paragraph, and establish a project if they conform to the provisions of the preceding paragraph.

The administrative departments of standardization of the people's governments of provinces, autonomous regions and municipalities directly under the Central Government may put forward suggestions to the administrative departments of standardization of the State Council to formulate mandatory national standards, which shall be decided by the administrative departments of standardization of the State Council jointly with the relevant administrative departments of the State Council. Social organizations, enterprises, institutions and citizens may put forward suggestions to the administrative department in charge of standardization in the State Council to formulate mandatory national standards. If the standardization administrative department of the State Council considers it necessary to establish a project, it shall decide with the relevant administrative departments of the State Council.

Mandatory national standards are issued with the approval or authorization of the State Council.

Where laws, administrative regulations and the State Council decisions provide otherwise for the formulation of mandatory standards, such provisions shall prevail.

Eleventh basic and universal technical requirements, which are compatible with mandatory national standards and play a leading role in related industries, can formulate recommended national standards.

Recommended national standards shall be formulated by the administrative department of standardization of the State Council.

Article 12 Trade standards may be formulated for technical requirements that are not recommended by the state but need to be unified within a certain industry in the country.

Industry standards shall be formulated by the relevant administrative departments in the State Council and reported to the standardization administrative departments in the State Council for the record.

Twenty-fifth products and services that do not meet the mandatory standards shall not be produced, sold, imported or provided.