يمكن تقسيم الزجاج إلى نوعين هما؛ العادي أي زجاج الصودا والجير والسيليكا، والزجاج النوعي، فالزجاج العادي هو الأكثر إنتاجا ويتكون من الرمل (أو السيليكا التي هي أكثر نقاوة من الرمل) والجير والصودا.
والسيليكا المنصهرة وحدها تنتج زجاج ممتاز، لكنها تنصهر عند حوالي 1700 درجة مئوية أي أن إنتاج الزجاج بهذه الطريقة مكلف، لذلك فهذه الطريقة تقتصر على إنتاج الزجاج المتوجب فيه درجة أفضل من الخمول الكيميائي والقدرة على تحمل الصدمات الحرارية أو في إنتاج أغراض البصريات وتستعمل الصخور الكريستالية بدل كوارتز الرمل لإنتاج هذا النوع.
أما في حالة الزجاج العادي فان السليكا (أو الرمل) يضاف إليها مُسهّل صهر لتخفيض درجة الحرارة اللازمة لصهر المزيج، لهذا فإن الصودا تستعمل لتسهيل الصهر حيث أنه بإضافة 25 بالمئة من الصودا إلى السيليكا تكون درجة انصهار المزيج عند 850 درجة مئوية بدل 1700 درجة مئوية، لكن الزجاج الناتج منهما لا يصمد في الماء بل يذوب ولذلك يسمى زجاج الماء، وهنا يكمن دور إضافة الجير، فبإضافة الجير إلى مزيج السيليكا والصودا نحصل على زجاج لا يذوب في الماء بينما تكون درجة حرارة صهر المزيج ليست عالية جدا، لكن إضافة كمية كبيرة من الجير تجعل الزجاج الناتج سهل التفتت.
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