What is ISO 18754 about?
ISO 18754 specifies methods for the determination of the apparent solid density, bulk density, apparent porosity and geometric bulk density of fine ceramics, including all ceramic matrix composites.
Note: The archimedes method does not apply to materials with apparent porosity greater than 10%, open porosity less than 0.5% or which have an average pore size of greater than 600 μm.
Who is ISO 18754 for?
ISO 18754 on fine ceramics is relevant to:
- Ceramics industry
- Ceramic engineering
Why should you use ISO 18754?
The measurement of bulk density during production is a fundamental parameter for the quality of the product. The bulk density provides valuable information needed to control the quality of a ceramic piece (after firing) concerning its final size and the porosity and cracks in the body. It is therefore important that optimum measurement procedures are followed in determining density.
In ceramics, porosity is considered an indication of density, strength, and durability. Porosity is measured by the weight increase when boiled in water.
ISO 18754 describes two methods and are designated as Methods A and B, as follows:
- Method A: Determination of bulk density, apparent solid density and apparent porosity by liquid displacement (Archimedes' method).
- Method B: Determination of bulk density only, by measurement of geometric dimensions and mass.
As measuring the density and porosity of ceramics is a fundamental parameter for the quality of the product it must be done very diligently. ISO 18754 helps you in this regard by providing two methods to measure the same and this can ensure you have the necessary valuable information needed to control the quality of a ceramic piece. This will increase the safety and durability of your product and in turn increase credibility and revenue for your organization.
What’s changed since the last update?
BS ISO 18754:2020 replaces the second edition ISO 18754:2013, which has been technically revised. The main changes compared to ISO 18754:2013 are as follows:
- Clarification of the different methods covered by the document
- Extension of the applicability field of the method to ceramic matrix composites (including the fibre reinforced matrix)
- Incorporation of specific requirements in terms of geometry and sizes of the test specimens in this case