2012-08-08 14:51
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高真空技术中使用的扩散泵油,要求耐热氧化性,冷却温度下蒸汽压低,且其蒸汽压随温度变化大,沸腾温度不能过高。早期曾使用水银,目前主要使用矿油类、脂类、聚苯醚及硅油等。其中以硅油的性能最好,它具有热氧化性高、粘温系数小、沸点范围窄、蒸汽压曲线陡(温度变化一点,蒸汽压变化很大),常温蒸汽压低,凝固点低加之化学惰性,无毒、无味、无腐蚀。
·Holds a wide variety of tubes,flasks,microplates,bags and odd-shaped vessels at virtually any angle ·Available with two different platforms(standard and magnetic) which can be interchanged for added versatility
Combines the permanent marking of a Sharpie®pen with a precise electrical counter!
•Precise temperature control and uniformity •Magnetized stainless steel platform can rock or rotate almost any container