After World War I, flame-cutting machines were widely used and manufacturers added copper and chilled cast iron to safes to prevent cutting. During the same period, high explosives were also used in intrusion safes, and in the 1920s Ratner added anti-blast relocking devices to safes, while Chubb, Milner, and Hobbs Hart all developed a number of explosion-proof products.

To deal with the turntable chainsaw and flame cutter, a lot of composite materials came into being, the landmark event is the 1962 Chubb introduced the emerging TDR (Touch & Drilling Resisting) material, this alloy material is enough to resist the electric drill and flame cutting attack; 1963, Stradford company was established and mass production of concrete safes, after many companies improved, steel plate + concrete + bulletproof fiber anti-explosive materials have also been introduced into the safe industry.

And fire safes from the initial alkali salt solution soaked wood to C.J. Gayler’s the ferruginous double cavity body, to Milner’s hardwood, sawdust and alum mixed filler, and then the American invention of “Paris Plaster” (Paris Plaster), explosion-proof filler or back to improved cement or gypsum board as the main body, the highest fire rating has exceeded 4 hours. In response to the constant birth of new stored objects, magnetic record materials developed anti-magnetic safes, while the collection of paintings and antiques made moisture-proof and waterproof safes quite a market. The development of lock technology also gave the safe huge development space, the ever-changing locks also bring more varieties for the industry, the traditional safe, code plate lock and key lock indispensable, S&G in the 1870s invented the mechanical time lock, timing has been more than 100 hours, that is, within the specified time anyone will not be able to open the safe.

After the 1960s by the semiconductor technology development of the electronic code lock, but also for the safe industry to bring a new look. The biometric technology developed in the 1980s brought fingerprint locks and palm locks; magnetic cards, IC cards, wireless radio frequency technology, etc. also gave rise to more safe products. All of these can find traces in today’s social life. In 1855 and 1860, there was an open competition between Milner and Price in England for safe fire and burglary prevention, as there were no clear rules, both sides Due to the lack of clear rules, both sides did whatever they could to sabotage each other’s products in public, and both sides lost; while Ratner and Chatwood, born in 1868, did win in 1892 with a more gentlemanly method of competition to obtain the results they needed. The famous sabotage competition in the history of safes occurred in 1867 at the Paris Universal Exhibition. The American firm of Herring and the British firm of Chatwood competed for a prize of 30,000 francs, resulting in Herring taking 232 minutes to open Chatwood’s safe, while Chatwood took 254 minutes, and then the unfairness of the judges turned the competition into a lawsuit of all sorts.