The frames of safety glasses, including those on this list, are typically made from a durable kind of plastic. Plastic is light-weight, tough, and versatile, which makes it great for holding lenses securely in place. The plastic used for most safety glasses frames is called acetate. Acetate has high impact strength, is hypoallergenic, and is unreactive enough to protect against a wide range of chemicals. All of these properties make it a great option for safety glasses frames.