Normas ISO

Metallic materials -- Knoop hardness test-- Part 1: Test method

Metallic materials -- Knoop hardness test-- Part 2: Verification and calibration of testing machines

Metallic materials -- Knoop hardness test-- Part 3: Calibration of reference blocks

Metallic materials -- Knoop hardness test-- Part 4: Table of hardness values

Plastics -- Standard atmospheres for conditioning and testing

Surface chemical analysis -- X-ray photoelectron spectroscopy -- Procedures for determining backgrounds

Mechanical testing of metals -- Symbols and definitions in published standards

Welding -- Arc-welded joints in aluminium and its alloys -- Quality levels for imperfections

Cinematography -- Relative and absolute sound pressure levels for motion-picture multi-channel sound systems -- Measurement methods and levels applicable to analog photographic film audio, digital photographic film audio and D-cinema audio