Chemring's £278m MCX Energetics Contracts: NATO 155mm Supply Chain

The Contracts at a Glance

Chemring Group (LSE:CHG) announced two contracts on 4 November 2024 with a combined value of £278 million. The first, through its Norwegian subsidiary Chemring Nobel AS, is a 12-year framework agreement with Diehl Defence GmbH & Co. KG for the supply of MCX energetic material, with an initial purchase order valued at €231 million (£196m). Deliveries begin in late 2026 over a five-year period. The second, through US subsidiary Chemring Energetic Devices (CED), is a $106 million (£82m) order for pyro-mechanical components destined for an undisclosed US missile programme, also commencing in 2026 over five years.

The financial headlines are well covered elsewhere. What matters for Weapons, Ordnance, Munitions, and Explosives (WOME) professionals is the technical and supply chain substance beneath them.

MCX: The Insensitive Explosive at the Heart of the Deal

MCX is a family of melt-cast explosive formulations jointly developed by Nammo Raufoss AS, the Norwegian Defence Research Establishment (Forsvarets Forskningsinstitutt, FFI), and Chemring Nobel AS. The formulations combine 3-nitro-1,2,4-triazol-5-one (NTO) as the primary insensitive component with either cyclotrimethylenetrinitramine (RDX) or cyclotetramethylenetetranitramine (HMX), bound in a matrix of trinitrotoluene (TNT) or 2,4-dinitroanisole (DNAN).

Published FFI data identifies four principal MCX variants:

For context, Composition B — the workhorse melt-cast fill that MCX is designed to supersede — delivers a Velocity of Detonation (VoD) of approximately 7,600 m/s at a density of 1.65–1.72 g/cm³. MCX-6002 and MCX-8001 match or marginally exceed this performance while achieving substantially improved insensitivity. The trade-off is visible in MCX-6100, where the substitution of DNAN for TNT as the binder reduces detonation velocity to 7,199 m/s and pressure to 190 kbar — but with a corresponding improvement in thermal stability and reduced sensitivity to mechanical stimuli.

The NTO component is the key differentiator. NTO exhibits significantly lower impact sensitivity than RDX or HMX, conferring the insensitive munitions (IM) characteristics required under STANAG 4439 — Policy for Introduction and Assessment of Insensitive Munitions — and assessed according to AOP-39 (Allied Ordnance Publication 39), which provides the detailed methodology for IM threat testing including Slow Cook-Off (SCO), Fast Cook-Off (FCO), bullet impact, fragment impact, shaped charge jet impact, and sympathetic reaction.

Qualification of MCX formulations proceeds under STANAG 4170 (Principles and Methodology for the Qualification of Explosive Materials for Military Use), which mandates a test programme spanning variation of properties with age, thermal stability, ignition temperature, impact and friction sensitivity, electrostatic discharge sensitivity, compatibility, detonation velocity, critical diameter, and shock response. Crucially, STANAG 4170 qualification of the explosive material does not equate to qualification of the complete munition — that requires further assessment under STANAG 4297 and AOP-15 for the specific hardware configuration.

The ARGE DiNa 155mm Programme: Scale and Dependencies

The MCX supply contract feeds directly into the ARGE DiNa 155mm programme — the industrial working group (Arbeitsgemeinschaft) formed in 2023 between Diehl Defence and Nammo to produce 155mm High-Explosive (HE) artillery projectiles for the Bundeswehr and allied forces. In July 2024, Diehl Defence described the initial Bundeswehr order as the largest artillery ammunition contract in its history, with a framework for up to 350,000 155mm rounds through 2029.

The supply chain architecture places Chemring Nobel in an acutely critical position. Chemring Nobel is the only qualified supplier of MCX material for Nammo’s munition technology. There is no second-source arrangement. If Chemring Nobel’s production were disrupted — through industrial accident, raw material shortage, or capacity constraint — the entire DiNa 155mm output would stall. The Norwegian government recognised this dependency, co-funding £32 million alongside the European Union (EU) to expand Chemring Nobel’s production capacity, with a feasibility study underway for a new military explosives facility in Norway.

Diehl Defence, following approval from the German Federal Cartel Office (Bundeskartellamt) in March 2026, is building a dedicated 155mm production facility in Germany. Nammo provides the ammunition technology and intellectual property; Diehl operates the production line. This split — Norwegian technology, German manufacturing, Norwegian explosive fill — establishes a three-node supply chain where each element is functionally irreplaceable in the near term.

The DiNa 155mm projectile itself is designed for full modular capability, compatible with modern fuzes and course correction modules (CCM), reflecting current NATO interoperability requirements. Hazard Division (HD) classification for the complete round would be assessed on the basis of the filled and fuzed configuration under the UN Recommendations on the Transport of Dangerous Goods and national regulations (ADR for European road transport, RID for rail). The base explosive fill — MCX with IM characteristics — would, in its unconfined state, fall under HD 1.1 (mass explosion hazard), Compatibility Group D (secondary detonating substance without its own means of initiation and without a propelling charge). The complete cartridge classification depends on the fuze state and packaging configuration.

Chemring Energetic Devices: The US Missile Contract

The second contract — $106 million through Chemring Energetic Devices (CED) in Downers Grove, Illinois — is for pyro-mechanical components in an undisclosed US missile programme. CED specialises in initiators, igniters, actuators, and separation mechanisms rather than warhead fills. These are the devices that initiate propulsion sequences, separate booster stages, deploy control surfaces, or arm warheads — small energetic components whose failure typically means mission failure.

CED has been manufacturing pyro-mechanical ordnance components since the 1950s and holds positions on multiple US missile platforms, with open-source reporting linking the company to the AGM-158 Joint Air-to-Surface Standoff Missile (JASSM), the Terminal High Altitude Area Defense (THAAD) system, and the BGM-109 Tomahawk cruise missile. A separate 15-year contract announced in June 2024 covered HMX energetics supply to Northrop Grumman for missile applications. The current $106 million order likely involves a similar class of pyrotechnic or explosive subsystem for a programme where CED holds a qualified-supplier position.

Wider Energetics Capacity and Countermeasures Implications

Chemring’s £90 million three-year capital expenditure programme, aimed at increasing energetics capacity by £60 million in annual revenue, spans production sites in Norway, Scotland, and the United States. This investment serves both the munitions energetics business and the countermeasures division, which commands over 50% of the global market for expendable decoys. The shared technology base is significant: propellant formulations, pyrotechnic compositions, and explosive materials developed for munitions applications transfer directly to infrared (IR) flares, radio frequency (RF) countermeasures, and Special Material Decoys (SMD) used to protect aircraft and naval vessels from guided missiles.

In financial year 2025, the combined countermeasures and energetics segment delivered revenue of £322.7 million (up 16.8%) with operating profit of £61.6 million (up 36.9%) at a margin of 19.1%. The order book stood at £1,038 million by October 2024, with 95% revenue coverage for FY26 and 93% for FY27. These are not speculative growth numbers; they reflect committed multi-year procurement from NATO governments responding to well-documented ammunition shortfalls.

What the WOME Community Should Watch

Three issues warrant sustained attention from WOME professionals monitoring this programme.

First, single-source dependency on Chemring Nobel for MCX energetic material represents a structural vulnerability in NATO’s 155mm supply chain. Qualification of a second MCX source would require a complete STANAG 4170 test programme — a process measured in years, not months. Until that happens, any disruption to Chemring Nobel’s production directly constrains European 155mm output. The Norwegian government’s investment in capacity expansion addresses volume but not redundancy.

Second, the transition from Composition B to MCX-family fills across NATO artillery programmes has implications for ammunition storage, transport, and disposal. IM-compliant ammunition may permit revised Quantity-Distance (QD) calculations under AASTP-1 (Manual of NATO Safety Principles for the Storage of Military Ammunition and Explosives), potentially allowing higher storage densities at existing Ammunition Storage Areas (ASA). Ammunition technicians should anticipate updated storage compatibility assessments as MCX-filled munitions enter NATO inventories alongside legacy Composition B stocks.

Third, the five-year delivery timeline commencing late 2026 means the first MCX-filled DiNa 155mm rounds will not reach operational units before 2027 at the earliest. Against the backdrop of urgent European ammunition replenishment following drawdowns for Ukraine, this timeline reflects the structural lag between contract signature and operational fielding that characterises complex energetics procurement. There are no shortcuts: explosive qualification, production ramp-up, proof and acceptance firing, and logistics integration each impose timelines that no amount of political urgency can compress.

ISC Commentary

These contracts confirm what the European defence industrial base has been signalling since 2022: the era of minimal ammunition stockholding is over, and the energetics supply chain is the binding constraint on rearmament. Chemring’s position is enviable — sole-source for MCX, established on major US missile platforms, dominant in countermeasures — but that concentration of capability in a single corporate entity is precisely the kind of fragility that ammunition supply chain planners should be stress-testing. The technical performance of MCX is not in question; the resilience of its production base is.