What plastic is the softest?
Polyethylene is a common plastic with a relatively low hardness, so it can be considered a relatively soft plastic. The softness of polyethylene makes it popular in many applications, especially in packaging, containers, bags, plastic films, etc.
There are two main types of polyethylene: High-Density Polyethylene (HDPE) and Low-Density Polyethylene (LDPE). LDPE is relatively soft and has better flexibility and toughness, while HDPE is relatively hard and is more suitable for some applications that require higher stiffness and hardness.
Overall, polyethylene is an affordable, easy-to-process, lightweight, flexible, and adaptable plastic.