The surface finish of tungsten needles can significantly affect their performance. A smooth surface finish can reduce friction and make the needle more precise and accurate when used for tasks such as piercing or injection. A rough or uneven surface can cause resistance or drag, making it more difficult to penetrate or manipulate materials. In addition, a smooth surface can reduce the likelihood of contamination, as rough surfaces can trap particles or bacteria. Therefore, tungsten needles are often finished with polishing or electrochemical processes to achieve a smooth, consistent surface.
