Question

Say you are working for a company and designing a medical device. The device needs a mechanical part, specifically a gear, which is to be light weight, strong and tough. It must not be electrically conductive. It will not be in contact with water, so corrosion and hydrolysis are not issues. It must withstand continuous expose to a relatively high temperature (about 80°C). Suggest a specific material for this application. Briefly justify your answer

Answer 1

Since the material need to be resistant to electricity, and should be light weight, plastic is a best opyopt when it comes to gears, the plastic need to be hard, wear resistant and should work continuously.

Hence High Density Poly Ethylene HDPE could be used for this purpose.

HDPE is formed by extrusion process. It has a Density of 970 kg/m3. It has branching structure which gives stronger intermolecular forces and high strength to it

It can withstand temperatures up to 120 ? and have good chemical resistivity.