Polycarbonate (PC) has very high tensile strength; for reference, it is over 200 times stronger than glass. In addition to this, it also has very high impact resistance, capable of withstanding impact over 900 psi. PC is unquestionably a very strong, touch and durable material, but it is not completely unbreakable. It is, however, shatter resistant. So, in the unlikely event that PC were to break, it will never shatter into lots of small, sharp pieces and become a health and safety hazard.