Pipette Tip Selection Guide

First, the material

Currently, the tips on the market are basically made of polypropylene plastic (a colorless transparent plastic with a high chemical inertness and a wide temperature range). However, the same polypropylene, the quality difference will be great: high-quality tips are generally made of natural polypropylene, while low-cost tips are likely to use recycled polypropylene plastic (in this case, we can Said that its main ingredient is polypropylene). In addition, most of the tips will add a small amount of additives during the manufacturing process. Common ones are: 1. Color-developing materials. The blue gun head (1000ul) and the yellow gun head (200ul), commonly known in the market, add corresponding chromogenic materials to polypropylene (we hope to be high-quality masterbatch, not cheap industrial pigments); 2, release agent. Help the tip quickly disengage from the mold after forming. Of course, the more additives, the higher the probability of an undesirable chemical reaction taking place during pipetting. So it is best not to add additives! However, due to the relatively high requirements on the production process, the tips without additives at all are rare on the market.

Second, packaging

The packaging of the tips is mainly in bags and boxes. In the relatively mature market, boxed products account for the majority; in China, bagging is currently the absolute mainstream - mainly in bags. The so-called bag is to put the tip in a plastic ziplock bag, 500 or 1000 per bag (the number of bags per lot will be much less). Most users will buy the bagged tip and then manually put the tip into the tip box. Although China's labor force is relatively cheap, it also increases the chances of pollution! In addition, in recent years, a new form of packaging has emerged, which is a refill (8 or 10 plate tips stacked in a tower shape, which can be quickly loaded into the tip box without touching the tip). This type of tip requires less storage space and significantly reduces the use of plastic to achieve environmental protection. Although the domestic share of this form is still very small, it must be the general trend in the long run.

Third, the price

We first discuss the bagged tips (based on 10ul, 200ul and 1000ul, 1000 bags per bag) - the teacher told us that we must catch the main contradiction. The bag tip is mainly divided into three grades: one, the imported tip. According to the deaf people, the most expensive one is EPPENDORF, a bag of 400-500 yuan, and a slightly larger sales, such as BRAND, RAININ, etc., generally 100-150 yuan; Second, imported brands, domestic production (that is The so-called "fake foreign devil"). The representative brand of this grade is Axygen, its price is generally 60-80 yuan; three, domestic tips. The price range of domestic tips is generally 30-60 yuan. There are two representative products, one is the tip of Gongdong (it is better in domestic tip), and the other is the tip of Haimen (Haimen is a very important production base of plastic consumables in China. There are many tips in this place. Manufacturers, these manufacturers are usually characterized by small scale, poor production environment, poor quality control or no, but the price of their products is very low). The second is the boxed tip and the refilled tip. The price of the boxed tip is 1.5-2.5 times that of the bag tip, and the refill tip is 10-20% cheaper than the box tip.

Pipette tip specifications

10ul (0.5-10ul white short tip / 0.5-10ul white long tip)

20ul (0.5-20ul white long)

100ul (10-100ul yellow)

200ul (20-200ul yellow)

1000ul (100-1000ul blue)

5000ul (1000-5000ul white)