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3 Acoustic properties
For single-vision and most multifocal lenses
Electric double-layer capacitors for power are intended for applications that require discharge currents in the range from mA to A
BS EN 2591-702 covers the requirements and procedures for the test method used for measuring the signal distortion of couplers for elements of the electrical and optical connection
Leather. Tests for colour fastness. Colour fastness to crocking has-corrigendum 3 Acoustic properties1 Scope This International Standard specifies a method for determining the amount of colour transferred from the surface of coloured leather to other surfaces by rubbing with a white cotton cloth. Two tests are carried out, one with a dry rubbing cloth and one with a wet rubbing cloth. The method is applicable to all types of coloured leather. Since after treatments of the leather as well as surface finishes can affect the degree of colour transfer,