First, the suction head material

In the suction market, the raw materials are basically polypropylene plastics (low adsorption, high chemical inertness, wide temperature range, colorless and transparent). What you may not know is that the same polypropylene, the quality will have a big difference. High-quality suction heads generally use natural pure polypropylene, while cheap suction heads are many recycled polypropylene (in this case, we can only say that its main component is polypropylene), such suction heads are generally very soft, and the wall of the suction head is thicker. The poor flexibility of the suction head is easy to lead to poor sealing consistency between the suction head and the pipette; The wall thickness of the suction head is easy to make the liquid residual, and the drainage is not flexible.

Second, the manufacturing and production process of the suction head

In addition to the raw material of the suction head, most of the suction head in the manufacturing process will also add color materials and a small number of additives, the more common are:

1. Color developing materials. The blue suction head (1000μL) and yellow suction head (200μL), commonly known on the market, are the corresponding color developing materials added to polypropylene. The developing materials need to use high-quality masterbatches, rather than cheap industrial pigments. Cheap industrial pigments introduced more unknown and complex ingredients to contaminate samples.

2. Release agent. It is mainly used to help the suction head to break away from the mold quickly after forming. In this case, the more additives, the higher the probability that a chemical reaction may occur during the pipetting process. Science has published an article showing that the detection of oleic acid amide and DiHEMDA in the suction head can affect the results of molecular biology experiments.