Jimmy from France sent us an email through the official website. He said that after seeing our official website, he was very interested in our volumetric flask brush. He hopes that our volumetric flask brush is soft and not too hard. Because the volumetric flask brush, he purchased earlier was too hard, the inner wall of the test tube was scratched, and even part of the test tube was broken.

We analyzed to Jimmy that the larger the diameter of the filament, the harder the filament, and the material will also affect the hardness of the filament. Nylon is the softest, but it is not ruled out that bad merchants use PP instead of nylon. For the volumetric flask brush, the filament we generally use is nylon 0.1mm-0.2mm, and the filament in this range is very soft, so there is no need to worry about scratching the inner wall of the container. We even sent our existing volumetric flask brush to Jimmy for reference.

After receiving the sample, Jimmy gave us feedback: "Your volumetric flask brush is indeed very soft, much softer than the volumetric flask brush I purchased before. I tried to clean it, the effect is still very good, I am very satisfied with your product. Let's talk about payment. "After several days of negotiation, we finally reached a cooperation.