Titanium Powder Explosion and Fire at Firearms Manufacturing Facility
Exeter, New Hampshire
Summary of the Incident
On July 27, 2026, an explosion and subsequent fires occurred inside a commercial 3D printing machine at the Sig Sauer manufacturing facility located at 18 Industrial Drive in Exeter, New Hampshire.
Firefighters responded shortly before 4:00 PM after receiving reports of excessive smoke and a localized blast. One employee suffered burn injuries from the blast and was transported via helicopter to a Boston-area hospital.
First responders and facility personnel identified active fires containing titanium within the hoppers of two additive manufacturing machines, reaching temperatures around 700°F (371°C). Because burning titanium reacts violently with air if disturbed, emergency crews opted not to disassemble the machinery. Instead, the compromised units were moved outside the facility and placed into sand to allow the material to burn off without spreading fire to the rest of the facility.
Facility and Industry Description
The incident occurred within a large-scale firearms manufacturing facility. The site utilizes additive manufacturing (metal 3D printing) technologies, which use reactive metallic powders like titanium to fabricate specialized firearm components. Metal additive manufacturing commonly relies on powder bed fusion or direct energy deposition, where fine metallic powders are melted layer-by-layer using high-powered lasers or electron beams inside inert, oxygen-deprived build chambers.
Speculation on Incident Factors
Fine titanium powders present severe combustible metal dust hazards due to their high surface-area-to-mass ratio and reactivity with oxygen. The initial explosion inside the 3D printer hopper may have been triggered by a breach in the inert atmosphere containment, localized electrostatic discharge, or physical friction during powder transfer within the printing system. A localized thermal excursion or incomplete inerting within the printer hopper could have ignited suspended metal dust, generating sufficient pressure to rupture the hopper enclosure and injure the operator nearby.
Top Sources of Information
ISSSource: 3D Printer Blast at Gun Maker Injures Worker (Published July 29, 2026)
WMUR News 9: 1 Person Hurt in Sig Sauer Fire (Published July 28, 2026)
New Hampshire Public Radio (NHPR): Explosion at Sig Sauer plant in Exeter injures worker (Published July 28, 2026)