Last year, the House was in session for 118 days prior to Election Day and 135 days total. In total, Congress passed 65 laws, the fewest in history. With this almost non-existent work schedule, it appears that the record is not only in doubt but could be obliterated.
Rating Newest Oldest. Best Answer: Common glass contains about 70-72 weight % of silicon dioxide (SiO2). The major raw material is sand (or quartz sand) that contains almost 100% of crystalline silica in the form of quartz.
The major ingredient for glass making is silica, in the form of sand. Only sand of exceptional purity can be used to make glass. If the sand contains a trace of iron, for instance, the glass made with it will have a greenish color. Even for ordinary window glass, sand must be better than 99 percent pure silica, perfectly white, and not too fine. But I guess if you are looking for 4 main ingredients... Silica Sand 60% Soda Ash 20% Limestone 15% Alumina-Silicate 4% Those are the 4 main I could find. But really it's all about the sand.