קרח יבש

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קרח יבש הינו המצב המוצק של פחמן דו-חמצני (CO2). הקרח היבש דומה במראהו לקרח שנוצר ממים, אך הוא הרבה יותר קר – הטמפרטורה שלו כ- 78°C- . שלא כמו קרח על בסיס מים, החימום לא הופך אותו לנוזל, אלא הוא עובר מיד למצב גזי בתופעה הנקראת “המראה” (סובלימציה) ומכאן שמו: “יבש”.

השימושים העיקריים לקרח יבש:
• קירור ושימור מוצרי מזון, חומרים ביולוגיים ומוצרים אחרים המתקלקלים בחשיפה לטמפרטורת הסביבה,
במיוחד בהובלה ומשלוח.
• קירור תותבים מתכתיים כך שיתכווצו לצורך כניסה לקדח מסוים.
כשהתותב חוזר לטמפרטורת הסביבה הוא מתרחב ומתהדק בקדח.
• יצירת אפקטים מיוחדים (עשן/ ערפל) – מופעים, שמחות וכד’.
• התזת פתיתי קרח יבש לניקוי משטחים.

תכונות פיסיקליות:
• צפיפות (ק”ג/מ”ק) 1562
• משקל מולקולרי (גר’/מול’) 44.01
• טמפ’ ניזול -56.6°C

מקסימה משווקת קרח יבש בתצורות הבאות:
• גלילונים בקוטר של כ- 9 מ”מ.
פתיתים בקוטר של כ- 3 מ”מ לשימוש בניקוי בקרח יבש.
בלוקים סטנדרטיים במשקל של כ- 4 ק”ג.

בטיחות בשימוש:
השימוש הבטוח בקרח יבש דורש הקפדה על הדברים הבאים:
• מגע בקרח יבש עלול לגרום לכוויות קור- יש להשתמש בכפפות מגן מבודדות.
• קרח יבש משחרר אדי פחמן דו-חמצני CO2 אשר בריכוז גבוה יכולים לגרום להפרעות נשימה ולחנק.
לפיכך יש לאחסן קרח יבש ולהשתמש בו במקום מאוורר.
• אין לאחסן קרח יבש במיכל אטום. אדי ה- CO2 הנוצרים עלולים לגרום לעליית לחץ, עד כדי ביקוע המיכל.
• הרחק קרח יבש מילדים.
• טיפול ונשיאה של קרח יבש מותרים אך ורק על פי הוראות הבטיחות

להורדה - שימושים בקרח יבש:

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