BS/EN 13373-2020 pdf download.Natural stone test methods _ Determination of geometric characteristics on units.
This BS/EN 13373 describes methods for verifying the geometric characteristics of products of natural stone such as rough blocks, rough slabs, finished products for cladding,. flooring,, stairs and modular tiles and paving units (slabs, setts and kerbs). These methods can be applied in the case of a dispute between two parties, they are not compulsory for production control.
Other measuring equipment can be used as long as their precision can be demonstrated to be equal or better than the ones mentioned here.
It is essential that all weighing, measuring and testing equipment are calibrated or retraceable to measurement standards and regularly inspected according to documented procedures, frequencies and criteria. It is important that the expression of the dimensional characteristics is in accordance with the appropriate class of time measured product.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
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4 Measurement ofthe dimensions of squared rough blocks
4.1 Measurement of the gross dimensions of squared rough blocks
4.1.1 Principle
Measurement of the dimensions of the smallest rectangular cuboid with straight edges that contains a rough block
4.1.2 Apparatus
— A rigid ruler of appropriate length graduated in 0.01 m.
4.1.3 Measurement procedure
The gross length Xgross. the gross width Ygross and the gross height Zgross of the block are measured in the following manner:
4.1.4 ExpressIon of the results
The average grass dimension is expressed for each direction to the nearest 0.01 rn
4.2 Measurement of net dimensions of rough blocks
4.2.1 PrincIple
Measurement of the dimensions of the largest rectangubr cubold with straight edges that can be Inscribed within a rough block
4.2.2 Apparatus
— Arlgidrulerofappropriatesizegraduatedin 1mm.
4.23 Measurement procedure
The net length x,.e. the net width y and the net height z of the black are measured in the following manner
— Define the largest cuboid that can still be inscribed within the rough block.
— Estimate and trace the net dimension of the block x. met and z,,e (see Figure 2).BS/EN 13373-2020 pdf download.