Humidity Control in Explosives and Ammunition Manufacturing

Q: What are the operational benefits of correct humidity control in explosive environments?

Proper humidity management: - Prevents static buildup and accidental ignition - Maintains chemical and ballistic stability - Protects metal components from corrosion - Improves process consistency and product reliability

Q: Why is humidity control important in explosives and ammunition manufacturing?

Explosives, propellants, and primers are highly sensitive to static electricity, moisture, and temperature changes. Humidity control ensures a safe environment by preventing static discharge (too dry air) and avoiding moisture absorption (too humid air), which can degrade explosive materials and cause misfires or instability.

Q: How does dehumidification protect propellant powder drying and blending areas?

During propellant production, excessive humidity can cause clumping, inconsistent grain size, or unstable burn rates. Dehumidified air ensures uniform drying, maintains chemical stability, and supports consistent ballistic performance of powders and solid fuels.

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Benefits

In explosive and ammunition manufacturing and storage environments, keeping relative humidity in the 50–55% RH range improves safety and material stability and lowers reject rates.

Reduction of ESD Risks

Raising RH to the mid-range improves conductivity of surfaces & air so charges dissipate instead of building up, which can result in a damaging discharge.

Dust and Particle Reduction

Higher RH promotes particle agglomeration and deposition (less airborne dust), reducing dust-related runnability and ignition sources.

Material and Components Stability

Propellants, binders and polymer components change dimensionally with humidity. Controlled RH reduces shrinkage, cracking and rejects.

Explosives and Ammunition Humidity Control

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Adiabatic Options

Provide humidification without electrical heating elements in the airstream, making them suitable for many hazardous zones. They also offer very fine droplet control for quick, even humidification.

Proven ESD Benefit

Condair and independent ESD guidance both cite mid-range RH (~50%) as effective in reducing ESD events when used alongside standard ESD program controls (grounding, wrist straps, ESD floors, etc.).

Use Cases

Anti-Static and ESD Prevention

Low humidity increases static buildup because dry air acts as an insulator, making electrostatic discharge (ESD) more likely. Maintaining 40–60% relative humidity helps dissipate electrical charges and significantly reduces ESD risk.

Application Brochure

19-722 Why Humidify for Defense document · 1.6 MB

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Frequently Asked Questions

What are the operational benefits of correct humidity control in explosive environments?

Why is humidification necessary in explosive handling and filling areas?

When the air is too dry (below ~40% RH), static electricity can easily build up on workers, tools, and machinery. A controlled level of humidification (typically 45–55% RH) helps dissipate electrostatic charges, reducing the risk of accidental ignition during mixing, filling, or assembly operations. This is essential for ATEX-compliant facilities handling explosive atmospheres.

Why is humidity control important in explosives and ammunition manufacturing?

How does dehumidification protect propellant powder drying and blending areas?

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