美国Brand,： 52858-000Item#, 美国封口膜<br>英文名称： Parafilm M

实验室使用最广泛的封口膜，卷装，厚度0.127mm，半透明、无味，不会对样品有污染。21℃时可拉伸200%。拉伸之后覆盖于器皿上便可快速封口，适用于试管、烧杯、三角烧瓶等器皿的封口。化学耐受性极佳，密封性好。在82℃至93℃时，它变得非常

Flexible, thermoplastic, rolled, waterproof sheet interwound with paper to prevent adhering. Semi-transparent, almost colorless, odorless, and tasteless. Supplied in 0.127mm (0.005") thickness. Adheres quickly and firmly to itself, covering culture tube or flask mouths and sealing petri dish edges. Excellent resistance to air, other gases, alcohol, common acids, and moderately concentrated alkalies. At 21°C (70°F), it stretches 200% and returns partially to its original size. At 82 to 93°C (180 to 200°F), it softens enough to make an adhesive bond between papers, cloths, leathers, etc. Supplied in dispenser cartons.

Roll Size	Supplier No.	Cat. No.	Unit
5.1 cm x 76.2 m (2" x 250')	PM992	52858-076	Case of 24
5.1 cm x 76.2 m (2" x 250')	PM992	52858-076	Each
10.2 cm x 38.1 m (4" x 125')	PM996	52858-000	Case of 12
10.2 cm x 38.1 m (4" x 125')	PM996	52858-000

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