A material or substance having one or more characteristic values that are sufficiently uniform and well determined to be used for calibrating equipment, evaluating measurement methods, or assigning a value to the material. Can't tell the difference between standard material and standard sample? Don't worry, the following Bolinda Xiaobian to introduce you.

In the international standard material and standard sample English name are "Reference Materials", by ISO/REMCO organization is responsible for this work. In our country, the measurement system is called "Reference Materials" as "standard materials" and the standardization system is called "standard sample". In fact, they have a lot in common, but there are also some minor differences.

1. Management organization of standard substances and standard samples

Standard samples: Department of Standards of the State Bureau of Technical Supervision (the National standard sample Technical Committee is responsible for organization and review, approved by the Department of Standards, issued by the State Bureau of Technical Supervision)

Standard Substances: Metrology Department of the State Bureau of Technical Supervision (the National Standard Substances Technical Committee is responsible for organization and review, approved by the Metrology Department, issued by the State Bureau of Technical Supervision)

2. Code of standard material and standard sample

Standard sample: GSB

Standard material: GBW - first class standard material; GBW(E) - secondary reference material;

3. Definition of standard material and standard sample

Standard sample: A standard sample is a batch of samples with one or more chemical, physical, biological, engineering or sensory performance characteristics that are sufficiently uniform, have been technically identified, and are accompanied by a certificate of relevant performance data. A certified standard sample is a standard sample that has one or more performance characteristics, is accompanied by a certificate indicating the above performance characteristics, and is approved by the national standardization management agency.

Reference substance: A reference substance is a substance or material that has one or more sufficiently uniform and well defined quantities of its properties, used to calibrate an instrument, evaluate a measurement method, or determine the quantities of a material. Certified reference material is a certified reference material, and its characteristic quantity value is determined by a metrological traceability method, and each characteristic quantity value determined is accompanied by a certain confidence level of uncertainty, which is called a first-class reference material in China.

4, the use of standard materials and standard samples

Standard sample: Standard sample is developed for the implementation and development of the needs of the standard, generally only in the scope of the standard involved in the use of it in the physical standard (relative to the text standard) can not be used as the transfer of measurement.

Standard material: Standard material is a measurement standard, which can be used as a measurement transfer, used to calibrate instruments, evaluate measurement methods, and determine the quantity value of materials, as long as it is suitable, it can replace standard samples in the formulation and implementation of standards.

The above content is the introduction of standard substances and standard samples, standard substances are used as tools and means of quantity transmission, and standard samples are national physical standards developed to ensure the implementation of national standards or industry standards. For example, the technical performance indicators of some products are difficult to describe clearly in words, and it is necessary to use physical objects as a supplement to the text standard, such as the appearance of wine, pigments, color and light.