The tips on the current market for pipette tips are basically made of polypropylene plastic (colorless and transparent plastic with high chemical inertness and wide temperature range). However, with polypropylene, there is a big difference in quality: high-quality tips are generally made of natural polypropylene, while low-cost tips are most likely made of recycled polypropylene plastic (in this case , the most we can say is that its main ingredient is polypropylene). In addition, most tips will also add a small amount of additives during the manufacturing process. The more common additives are:

1. Color material. The blue tips (1000ul) and yellow tips (200ul) commonly known in the market are the addition of corresponding color-developing materials to polypropylene (as a user, you must hope that it is a high-quality color masterbatch, not a low-cost industrial pigment. );

2. Release agent. It is mainly used to help the tip to be quickly released from the mold after forming. In this case, the more additives, the higher the probability that undesired chemical reactions may occur during pipetting. So the safest thing is to not add additives. However, due to the high requirements on the production process, pipette tips without additives are really rare in the market, so our users can only choose pipette tips with less additives when choosing.

More details can be found on the official website of Wuxin New Materials. https://www.wuxinxcl.com/