C4 plastic explosive
GAO materials identify Expro Chemical Products as one of the current C-4 producers in Canada, which ties the builder facet to the catalog's C4 entry.
Sources: GAO C-4 explosive reportBuilt by archive
Expro Chemical Products Weapon Systems
Expro Chemical Products was the Quebec energetic-materials producer behind the Valleyfield plant lineage that later became Expro TEC and then General Dynamics OTS Canada Valleyfield, and in this catalog it anchors the C4 manufacturer facet.
1 weapon systemsExpro Chemical Products sits in the long Valleyfield industrial lineage that began with wartime explosives production at the Defence Industries Limited complex. Quebec heritage records say the site became Valleyfield Chemical Products in 1978, Expro Chemical Products in 1982, Expro TEC in 2001, and part of General Dynamics OTS in 2007.
For this catalog, the builder matters because it explains why a historical Quebec energetic-materials name still appears in modern weapon data. The profile keeps the Expro facet separate from its successors while preserving the corporate and site history behind the Valleyfield propellant and explosives base.
Notable Systems
Builder History
Valleyfield explosives complex is built
The Quebec heritage record says the Defence Industries Limited complex was built in 1940-1941 for wartime explosives production at Salaberry-de-Valleyfield.
Sources: Quebec heritage entry
Site becomes Valleyfield Chemical Products
The Quebec heritage record says the former DIL site was sold in 1978 and renamed Valleyfield Chemical Products Inc. under Space Research Co.
Sources: Quebec heritage entry
Expro Chemical Products name appears
The Quebec heritage record says the site was resold in 1982 and became Expro Chemical Products Inc.
Sources: Quebec heritage entry
TPC report describes an automotive-airbag process
Canada's Technology Partnerships Canada annual report says Expro Chemical Products of St-Timothée developed a process that adapted military hand-grenade technology for next-generation automotive airbags.
Sources: TPC annual report 1998-1999
Expro TEC name follows acquisition by SCN Technologies
The Quebec heritage record says the company became Expro TEC in 2001 after SCN Technologies acquired it.
Sources: Quebec heritage entry
General Dynamics acquires the Valleyfield operation
The Quebec heritage record says General Dynamics OTS acquired EXPRO TEC in 2007, carrying the Valleyfield energetic-materials line forward under a new corporate owner.
Sources: Quebec heritage entry, GD-OTS Canada about us
Predecessors
Successors
Website links
Public sources usually discuss this lineage under the later Expro TEC and General Dynamics OTS names, so the profile keeps Expro Chemical Products as the canonical catalog facet and uses successor-company records only as sourced history.
Builder Sources
- GD-OTS Canada official sitePublisher: General Dynamics Ordnance and Tactical Systems - Canada | Note: Supports the current successor company's identity, its Canada-wide defense-manufacturing role, and the official site field used for the builder profile. | Accessed: 2026-06-21
- GD-OTS Canada about usPublisher: General Dynamics Ordnance and Tactical Systems - Canada | Note: Supports the company's defense-manufacturing overview, the Valleyfield energetic-materials plant context, and the successor-company framing used in this profile. | Accessed: 2026-06-21
- GD-OTS Canada contactPublisher: General Dynamics Ordnance and Tactical Systems - Canada | Note: Supports the Valleyfield plant address and current operating context for the historic Expro site lineage. | Accessed: 2026-06-21
- Quebec heritage entryPublisher: Ministère de la Culture et des Communications du Québec | Note: Supports the detailed Valleyfield site history, including the 1978 Valleyfield Chemical Products rename, the 1982 Expro Chemical Products rename, the 2001 Expro TEC acquisition, the 2007 General Dynamics purchase, and the 55 rue Masson location. | Accessed: 2026-06-21
- TPC annual report 1998-1999Publisher: Innovation, Science and Economic Development Canada | Note: Supports the 1998-03-31 Technology Partnerships Canada report entry describing Expro Chemical Products' airbag process development work at St-Timothée. | Accessed: 2026-06-21
- GAO C-4 explosive reportPublisher: U.S. Government Accountability Office | Note: Supports the historical C-4 producer context that ties Expro Chemical Products to the catalog's C4 entry through manufacturer lineage. | Accessed: 2026-06-21
Category
Munitions
Standalone missiles, bombs, rockets, torpedoes, and guided or unguided explosive payloads.
