scope:

This International Standard specifies construction characteristics, optical qualities and heating circuit, dimensions for interchangeability (outer dimensions and glass thickness), tests, marking and designation of heated glass panes for ships' rectangular windows (H series: see ISO 3903: subclause 4.1.3). It includes the conditions with wich they are required to comply to ensure the safety of ships in times of frost or snow, particularly during manoeuvres in port. Heated glass panes are used on ships principally for the windows of wheel-houses and bridges, and also in enclosed locations used for look-out and manoeuvring purposes. This international standard specifies heated glass panes which are intended for use at temperatures down to -40 °C.