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The extra clear glass is a type of float glass, which has very low iron content and hence is also called low iron glass. The iron content in float glass is usually 830 - 850 ppm (parts per million), while iron content in an extra clear glass is less than 150 ppm. It allows almost 92% of visible light to be transmitted.
SGP (SentryGlas Plus) is a popular security interlayer used in laminated glass, with increased strength and security. Heat soaked and toughened glass can be incorporated into the laminated glazing to create a secure pane that will be tough to break and even tougher to break through.