Class F1 stainless steel calibration weights – The benchmark for high-precision weighing
Designed to meet the demanding requirements of metrology, industrial and pharmaceutical laboratories, the F1 class stainless steel calibration weight series allows the calibration of F2 class weights and use with class I and II weighing instruments. These weights are manufactured in accordance with the international recommendation OIML R111, ensuring strict compliance with the tolerances permitted for this category.
The models in this series cover a range from 1 gram to 20 kilograms. Weights from 1 g to 20 g are manufactured in a single piece, without an adjustment cavity, ensuring a uniform mass without internal variation. From 50 g upwards, the weights have a discreet adjustment cavity integrated into their structure, allowing fine adjustments during initial calibration or periodic recalibrations.
Each weight is individually identifiable, ensuring full traceability in accordance with the standards required for quality systems or accreditations. The use of stainless steel selected for its density (8000 ± 100 kg/m³), mechanical stability and corrosion resistance ensures high stability over time.
Physically, F1 weights are characterised by very low surface roughness ( Rz < 2 µm, Ra < 0.4 µm), which limits dust adhesion and facilitates cleaning. Their permanent magnetisation is less than 25 µT, making them compatible with environments sensitive to electromagnetic fields. Magnetic susceptibility varies depending on mass, but remains strictly controlled: less than 10 for masses less than 1 g, 0.7 for masses between 2 g and 10 g, and less than 0.2 for weights greater than 20 g.
These weights are used in high-precision balance checks, quality control in regulated environments, and accredited metrology services. They can be integrated into any process requiring a reliable, stable and traceable mass reference without compromising regulatory compliance.
The series allows for the methodical organisation of calibrations by covering all of the most commonly used nominal values. It can be integrated into metrology management systems for monitoring internal weighing instruments or into verification protocols for critical scales.
To preserve their metrological qualities, weights must be handled with care, using clean gloves, and stored in suitable cases that limit shocks, dust and temperature variations. Their ergonomic design, stability during handling and easy-to-clean surface make them easy to use on a daily basis.
