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Density Determination
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Scope and Field of Application
BS EN ISO 2811-1 and BS 3900-A19 are alternative names for the same method which is intended for the determination of the density of paint, varnishes and related products using a pyknometer (otherwise known as a density bottle). This method can be used for most samples provided they do not contain entrapped air.
BS EN ISO 2811-4 and BS 3900-A22 are alternative names for the same method which is intended for the determination of the density of paint, varnishes and related products using a pressure cup. The method is intended for use with products, like emulsion paints, which may contain small bubbles of entrapped air.
There are no pass/fail criteria defined in the standards. This is a matter of agreement between the parties concerned.
The actual standards are copyright-protected documents and we are not able to provide you with copies. If required however, you can easily obtain copies from the British Standards Institution.
Summary of Methods
BS EN ISO 2811-1: BS 3900-A19
The sample and the pyknometer are allowed to equilibrate in a constant temperature room then weighed before and after filling with the sample. Since the volume of the pyknometer is known, the density of the sample can be calculated.
BS EN ISO 2811-4: BS 3900-A22
The sample under test is compressed in a pre-weighed cylindrical pressure cup in order to reduce any error due to air bubbles which may be present. The cylinder is then re-weighed and the density is calculated from the mass of the sample and the known volume of the cylinder.
One limitation of this method is that the equipment can be too heavy to weigh on a standard four-place balance. This means the results are not as precise as those obtained using the BS EN ISO 2811-1: BS 3900-A19 method.
Sample Requirements
We require no more than 500 ml of sample.
Accreditation
PRA is accredited to ISO 17025 by the United Kingdom Accreditation Service (UKAS) to carry out these tests.
Please contact Peter Collins for further details.
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