Acoustics. Determination of sound insulation performances of enclosures - Measurements under laboratory conditions (for declaration purposes) has-digital ISO/TR 21958 outlines the most

ISO/TR 21958 outlines the most used test methods considered in standardization work relating to scratch and abrasion resistance of plastic spectacle lenses along with their technical capacities and limitations

The liberated cyanide is determined either by a photometric method or a titrimetric method using an indicator

This International Standard does not cover methods where test pieces are fully or partially embedded in a corrosive powder made up of salt

and Type 2 footwear to provide protection against mechanical hazards and against molten metal

This International Standard specifies a method for determining the payloads

Acoustics. Determination of sound insulation performances of enclosures - Measurements under laboratory conditions (for declaration purposes) has-digital ISO/TR 21958 outlines the most1 Scope This part of ISO 11546 specifies laboratory methods for the determination of the sound insulation performance (insertion loss) of small machine enclosures. It applies to a total enclosure only and not to the individual panels from which the enclosure is made. NOTES 1 Sound insulation for enclosure panels such as wall elements, doors, windows, silencers, etc. should be measured in accordance with other relevant standards. 2 Related standards