Standards Development
This International Standard specifies the individual measurements of notches and assigns specific codes which may then be used to label notched tools complying with the measurements and tolerances specified in this standard
Proper bonding requires the correct quantity of adhesive to be applied to the substrate. For installation of floor coverings, wood flooring and ceramic tiles, adhesives, thin bed mortars and similar products are spread (combed) onto the substrate commonly using grooved (notched) spatulas or trowels. The notches of the respective trowels permit flow of the substance to be applied which will then settle on the substrate in the form of strips (ridges). Consequently, the quantity of applied material per unit area essentially depends on the geometry of the notches. This document intends to specify the commonly used notch trowels.
The manufacturers of adhesives give binding recommendations for the quantity of an adhesive to be used for a particular application and specify the shape and size of the notched trowel to be used. The applicator must be able to rely on the fact that a tool he buys on the market meets the given specification. This is not the case when very inexpensive tools, made of low quality steel with high manufacturing tolerances, are offered and used.
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