TD2 (Two-sided hard coat) is a proprietary scratch coating from Essilor Laboratories of America and its partner labs. TD2 provides tough, durable protection for lenses. The hard coat is a polymer matrix mixed with particles made of silica, a glass lens material that provides the scratch resistance. The polymer matrix gives the hard coat flexibility and adhesion so it will not crack or peel. Essilor Laboratories provides a wide array of demo tools and point-of-purchase displays to help support a variety of premium coatings and lens materials, and to drive your message to patients.