Glass Science &Technology Magazin | United States America (US)

Create: 2022-12-13 Update: 2025-07-02 16:28:14

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در اکثر موارد از فلدسپات پتاسیک به عنوان ماده اصلی سازنده سرامیکها و کمک ذوب استفاده می شود در حالی که از فلدسپات سدیک در تهیه شیشه و لعاب استفاده می گردد. آلومینیم موجود در فلدسپاتها به جای قسمتی از سیلیس در شیشه جایگزین شده و مقاومت فیزیکی شیشه را در برخورد با اشیاء، خمیدگی و حرارتهای ناگهانی افزایش می دهد. مقدار اکسید آهن فلدسپاتها برای مصرف در صنایع چینی و لعاب نباید از 5/0 درصد و در صنایع شیشه نباید از 35/0 درصد بیشتر باشد. مقدار اکسید آلومینیم فلدسپاتها نیز نباید از 15 درصد تجاوز کند.
در حدود 65 درصد از آلکالی فلدسپات‌ها در صنایع شیشه سازی، 30 درصد در صنایع سرامیک و 5 درصد به عنوان پرکننده در صنایع لاستیک سازی، رنگ سازی و سایر موارد مصرف می‌شود. قیمت فلدسپات‌های پتاسیک نیز بیشتر از فلدسپاتهای سدیک است. کانی‌هایی مثل نفلین و تالک می‌توانند به عنوان جانشین فلدسپات‌ها در صنایع سرامیک و شیشه استفاده شود.

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Glass Science &Technology Magazin

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Telegram Auto-Delete Messages in Any Chat

Some messages aren’t supposed to last forever. There are some Telegram groups and conversations where it’s best if messages are automatically deleted in a day or a week. Here’s how to auto-delete messages in any Telegram chat. You can enable the auto-delete feature on a per-chat basis. It works for both one-on-one conversations and group chats. Previously, you needed to use the Secret Chat feature to automatically delete messages after a set time. At the time of writing, you can choose to automatically delete messages after a day or a week. Telegram starts the timer once they are sent, not after they are read. This won’t affect the messages that were sent before enabling the feature.

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