Canadian gum is a light yellow to slightly green, viscous, transparent, slightly fluorescent liquid. Has a pleasant aroma. Bitter. An amorphous substance that gradually becomes solid when exposed to air. It can be miscible with benzene, chloroform, xylene, ethyl acetate and cedar oil. Soluble in ethanol, ethyl ether, turpentine and petroleum ether, insoluble in water. The relative density is 0.987 ~ 0.994. Refractive index (n20D)1.52 ~ 1.54.

Canadian gum is mainly used in biochemical research. The lens and cover glass are glued to attach the microscope specimen. Used as varnish.. After the Canadian gum is dissolved in xylene, its refractive index is 1.52, close to the refractive index of glass (1.51), transparency is very good, almost colorless for sealing, hard and firm after drying, can be preserved for a long time. Therefore, it is a commonly used sealing agent. Canadian resins are available commercially in both liquid and solid forms. If it is solid, you can add about half the amount of xylene to the gum, put it in a warm place, and stir often to encourage the gum to dissolve. The relative liquid concentration after dissolution should be suitable for the glue to flow smoothly down one end of the glass rod (if it is to dry faster after sealing, benzene can be used instead of xylene).

Note:

1. Do not heat, otherwise the gum immediately turns dark brown, affecting the observation after sealing

2. The gum should be stored in a brown bottle and kept away from light

3, the glass bottle mouth should be closed to prevent evaporation and solidification

4. In order to prevent the gum from turning sour, add several small pieces of marble cleaned with xylene to the gum to neutralize the acidity.

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