The density (specific gravity) cups are instruments used to determine the specific gravity and density of paints, resins, coatings, technical liquids and similar products. They are suitable when the mass-to-volume ratio of the sample must be checked, an important parameter in quality control, material preparation and verification of product consistency between different batches.
A liquid density cup is a stainless-steel measuring instrument consisting of a cylindrical container and a lid with a hole. During filling, the hole allows excess liquid to escape and helps prevent trapped air bubbles, an important condition for correct measurement of the contained volume.
The operating principle of the density cup is based on a known volume: the container is filled with the liquid to be checked, excess material is removed through the hole in the lid and the sample is weighed. Knowing the volume of the cup and the mass of the contained liquid makes it possible to determine the density or specific gravity of the sample.
The density cup does not measure liquid viscosity. Viscosity describes a fluid’s resistance to flow, whereas density indicates how much mass is contained in a given volume. For this reason, the density cup is specifically intended for determining specific gravity and should not be confused with instruments designed for viscosity control.
In the production and inspection of paints, enamels, resins and coatings, density can provide useful information about correct material formulation, variations between batches, product concentration and consistency with expected values. A variation in specific gravity may indicate differences in composition, dilution or sample preparation.
The SADC296 range includes density cups with different capacities, selected according to the quantity of sample available and the applied inspection procedure. Versions of 37 ml, 50 ml and 100 ml are available, all made of stainless steel and designed for measuring the specific gravity of compatible liquids and products.
Correct use of the density cup requires attention to filling, instrument cleanliness and the absence of air bubbles. Even small residues, impurities or trapped bubbles can affect the result, particularly when comparing different samples or carrying out repeated checks on the same type of product.
SADC296 density cups are used for testing in accordance with ISO 2811-1, ASTM D891-B and ASTM D1475, technical references for determining the density or specific gravity of liquids, paints and similar products.
A calibration report is available on request, useful when the density cup must be included in a quality-control system with documented metrological checks.
Density cups therefore provide a simple and reliable solution for measuring the specific gravity of liquids, checking material density and verifying product consistency in laboratory and production processes.
Applications
- Determination of the specific gravity of paints and similar products
- Density measurement of technical liquids
- Quality control on resins, enamels, coatings and liquid finishes
- Verification of product consistency between different batches
- Control of material formulation and preparation
- Measurement on liquid samples compatible with the method
- Use in laboratories and production environments
- Checking the mass-to-volume ratio of the sample
- Testing in accordance with ISO 2811-1
- Testing in accordance with ASTM D891-B and ASTM D1475
FAQ – Specific gravity cups
What is a density cup used for?
It is used to determine the density or specific gravity of a liquid by measuring the mass contained in a known volume.
What does a density cup measure?
The density cup measures the relationship between the mass and volume of the sample. The result makes it possible to determine the density or specific gravity of the liquid.
Does a density cup measure viscosity?
No. A density cup does not measure viscosity. Viscosity concerns resistance to liquid flow, whereas a density cup is used to determine density and specific gravity.
How does a liquid density cup work?
The density cup is filled with the liquid to be checked, closed with its lid and weighed. The hole in the lid allows excess liquid to be removed and reduces the risk of trapped air bubbles.
Why is it important to avoid air bubbles in a density cup?
Air bubbles alter the volume actually occupied by the liquid and can affect the measurement result. Filling must therefore be carried out carefully.
Which materials can SADC296 density cups be used with?
They are used with paints, resins, enamels, coatings, liquid finishes and other products compatible with specific-gravity determination.
Which capacities are available?
The SADC296 range includes density cups with capacities of 37 ml, 50 ml and 100 ml, to be selected according to the sample quantity and inspection procedure.
Why measure the density of a paint?
Density can help verify formulation consistency, repeatability between batches and correct material preparation before use or quality control.
What is the difference between density and specific gravity?
In technical and quality-control contexts, the two terms are often used together when referring to the relationship between the mass and volume of a liquid. The applied procedure establishes how the result should be expressed.
Which standards do SADC296 density cups refer to?
SADC296 density cups are used for testing in accordance with ISO 2811-1, ASTM D891-B and ASTM D1475.
Is a calibration report available?
Yes. A calibration report is available on request.
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