Safety version of a prop built for action sequences — made from soft materials or with dulled edges to prevent injury.
Technical Details
Breakaway furniture uses predetermined breaking points with defined breaking forces of 15-30 Newtons. Sugar glass (isomalt-based) melts at 145°C and shatters into blunt fragments with edge angles under 30°. Stunt bottles made of wax have a breaking strength of a maximum of 2 Joules of impact energy. Soft props made of polyurethane foam achieve Shore hardnesses between 20A-40A. Collapsible structures utilize magnetic connections or spring mechanisms with release forces of 50-200 Newtons.
History & Development
In 1903, Edwin S. Porter first used prepared wooden crates in "The Great Train Robbery." In 1927, Bud Westmore developed the first sugar glass for Universal Studios. In the 1960s, Hal Needham introduced pneumatic breakaway systems. In 1995, Digital Domain revolutionized hybrid practical props with "Waterworld," combining real destruction with CGI enhancements. Since 2010, modern 3D printing methods have enabled custom-made predetermined breaking points with millimeter-precise fragmentation.
Practical Use in Film
"Raiders of the Lost Ark" (1981) utilized 47 different breakaway versions of the golden idol. For "The Matrix" (1999), the props department crafted 200 identical sugar glass windows with uniform breaking characteristics. In "John Wick" (2014), the stunt crew used balsa wood furniture with integrated air cushions for safe breakthroughs. Each prop is produced in sets of 6-12 identical copies, as retakes require multiple passes. Stunt coordinators test each prop beforehand with crash test dummies at defined impact speeds.
Comparison & Alternatives
Stunt props differ from hero props through their single use and reduced detail accuracy. CGI destruction has increasingly replaced practical breakaways for large-scale destruction since 2000, but costs $15,000-$50,000 per scene versus $200-$2,000 for practical props. Pneumatic rigs enable reusable destruction effects but require air connections and 2-3 technicians. Hybrid approaches combine real breakaway props in the foreground with digital destruction in the background for maximum credibility at controlled costs.