The IMAX format is generically called 15/70 film, the name referring to the 15 sprocket holes or perforations per frame. The film's bulk requires horizontal platters, rather than conventional film reels. IMAX platters range from 1.2 to 1.83 meters (3.9 to 6.0 ft) diameter to accommodate 1 to 2.75 hours of film. Platters with a 2.5 hour feature film weigh 250 kilograms (550 lb). IMAX uses ESTAR-based print film in their 15/70 rolling-loop film projection systems.
Silicon dioxide, also known as silica (from the Latin silex), is a chemical compound that is an oxide of silicon with the chemical formula SiO2. It has been known since ancient times. Silica is most commonly found in nature as quartz, as well as in various living organisms.
Silica is a naturally occurring mineral that can be found in the earthâs soil. Silica is the common type of mineral quartz that is made out of two things. It is made first with oxygen atoms and with the natural silicon element. This is an element that is used to get rocks to be formed. This property of silica makes it something that is highly abundant in a variety of places around the world.