Standard Weights

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Veidt Weighing is a standard weight factory in china, standard weights are benchmark instruments in the field of quality measurement. As the material embodiment of the international unit of mass, they play a crucial role in modern measurement systems. These precision manufactured metal blocks are not only essential tools for laboratories, factories, and inspection agencies, but also the infrastructure for ensuring global trade fairness and accurate scientific research.

The International Bureau of Weights and Measures defines standard weights as "physical measuring tools with specified shapes, materials, and technical characteristics, used to reproduce a given mass value". From microscopic laboratory research to macroscopic industrial manufacturing, standard weights are ubiquitous, silently supporting humanity's relentless pursuit of precise measurement.

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Classification system of standard weights

Classify by accuracy level

The International Organization for Legal Metrology classifies standard weights into the following levels:

1. E-grade: highest precision, used for calibrating other weights and precision scales
2. F-grade: High precision, used for laboratory precision measurement
3. M-grade: Industrial grade precision, used for routine testing and production process control

The Chinese National Standards (GB/T) are further divided into E1, E2, F1, F2, M1, M2, and M3 levels, forming a more comprehensive system for transmitting values.

Classify by material

1. Stainless steel weights: the most commonly used, with excellent corrosion resistance and stability
2. Cast iron weights: Low cost, commonly used in large industrial weighing equipment
3. Brass weights: Traditional material gradually replaced by stainless steel
4. Platinum iridium alloy weights: used for the highest precision standards, such as the national kilogram prototype

Classify by shape

The shape design of standard weights considers convenience of use and reduces the influence of air buoyancy. Common shapes include:

1. Cylindrical (commonly used below 1kg)
2. Sheet shaped (small mass weight)
3. Lock shaped (larger weight with handle)
4. Polygon (Special Purpose)

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Technical characteristics of standard weights

Material characteristics

Modern standard weights often use 316L stainless steel, which has the following properties:

1. Extremely low magnetism
2. High density (approximately 7.95g/cm ³)
3. Excellent corrosion resistance
4. Good mechanical stability and wear resistance
5. Low thermal expansion coefficient

Surface treatment process

High end standard weights undergo precision polishing and special cleaning treatment:

1. Surface roughness is controlled within Ra ≤ 0.05 μ m
2. Using ultrasonic cleaning and vacuum drying
3. Some weights are coated with a protective layer to prevent oxidation

Measurement performance indicators

The core technical parameters of standard weights include:

1. Quality tolerance: There are strict regulations for different grades
2. Repeatability: ≤ 1/3 tolerance limit
3. Long term stability: minimal annual variation
4. Magnetic susceptibility: E1 grade requirement ≤ 0.0005

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Use and maintenance of standard weights

Correct usage method

1. Use specialized tweezers or gloves to remove and place, avoiding direct contact
2. Handle with care to prevent collisions and falls
3. Maintain a stable temperature environment for use (20 ± 2 ℃ is recommended)
4. Pay attention to air buoyancy correction and perform vacuum weighing if necessary

Key points of maintenance and upkeep

1. Regular cleaning: wipe with anhydrous ethanol and lint free cloth
2. Storage environment: Special box with constant temperature and humidity ≤ 60%
3. Periodic verification: Conduct regular calibration according to national regulations
4. Avoid: strong magnetic fields, corrosive gases, and severe vibrations

Common problem handling

1. Surface contamination: professional cleaning and recalibration
2. Minor wear and tear: downgraded for use after evaluation
3. Obvious damage: Immediately stop using and send for inspection

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Modern application of standard weights

The core role in the metrological traceability system

The standard weights form a pyramid shaped value transmission chain:

1. National Standards → Work Standards → Standard Weights → Work Weights
2. Ensure consistency in the measurement value from the international kilogram definition to the end user

Industrial application fields

1. Pharmaceutical industry: precise weighing of drug ingredients
2. Precision Manufacturing: Quality Control of Components
3. Jewelry appraisal: precious metal quality testing
4. Laboratory research: high-precision experimental data acquisition

Integration of emerging technologies

Modern standard weight technology is deeply integrating with information technology:

1. Electronic tags record the full lifecycle data of weights
2. Blockchain technology used for value traceability authentication
3. Intelligent calibration system realizes remote measurement services

As witnesses of human civilization's precise measurement, standard weights will continue to play an irreplaceable role in technological development. From ancient weighing instruments to modern precision measurement, this seemingly simple tool carries humanity's relentless pursuit of precision and truth.