Figure summarizes the literature in recent years that reports mechanical properties of glassy thiol-ene photopolymers, categorized by the functional groups incorporated in the polymer backbone, including thiourethanes (by Hoyle and Savin), urethanes (by Bowman), triazoles (fresh and aged samples, by Bowman), and cyanaurates (by Shusteff). Our network polyamides occupy a previously uncharted territory, pointing to higher toughness. The toughness is comparable to several semicrystalline thermoplastic polymers, including Nylon 66, isotactic polypropylene (PP), and high-density polyethylene (HDPE). 17 (D) An Ashby plot of tensile properties for glassy thiol-ene photopolymers categorized by functional groups (Table ). Each polyamide network is consistently color coded.