Picnometer
Coatings & Industry > Physical properties > Density
Standards
BS 3900:A 12
SIS 18 41 11
SNV 37 100 VDA
621-103
DIN 53 217 ISO 2811
Density - PYCNOMETER Model 290
Establishment of the specific gravity of raw materials and of finished products when they are received is for many purposes standard practice.
Even at the final quality relevant pre-delivery-inspection the compliance of preselected data gives an important lead to the correct requested compounding of the present recipe.
Purpose and Application
Pycnometers are used to establish the density of coating materials and other fluids and paste products.
Test Principle
The density r of a substance is the ratio of its mass m to its volume V:
Unless otherwise specified, the density of the coating material is given at 20 °C.
The density at 20 °C may be specified as r20.
The density is measured by means of Pycnometers.
The Pycnometer container is filled with fluid. The difference in weight between the empty and full Pycnometer and it internal volume enables the density to be calculated.
Design and Function
The Pycnometers consist of a container and a lid with an overflow hole. There are two versions of Pycnometers available:
- Instruments made of anodized aluminium and
- Instruments made of stainless steel
each with a volume of
- 50 ccm or
- 100 ccm.
The standard ERICHSEN Pycnometers are made to a tolerance of 0.2 %. Upon request and at an extra price, all instruments can be made to a tolerance of 0.1 % and supplied with a certificate of the Official Bureau of Weights and Measures.
The 100 ccm Pycnometer is for general use, whereas the 50 ccm version is used primarily for paste materials, as it is easier to handle for this application.
