Desiccant for Ammo Storage: The Complete Guide to Keeping Your 5.56 Dry

Moisture Is the Only Variable That Kills Stored Ammo

Brass-cased 5.56 ammunition stored in an airtight container lasts 50+ years. The brass, lead, and copper are chemically stable for decades. What degrades is the propellant powder and primer compound — both are sensitive to moisture. A sealed container without desiccant traps whatever humidity was present at the time of sealing. Over years, that residual moisture works on your primer compounds.

Desiccant eliminates this variable. One pack per can, replaced every 2–3 years. It's the only consumable in the entire SCUSA storage system — and the only maintenance task that stands between your ammunition and long-term degradation.

How Desiccant Works

Desiccant is a hygroscopic material — it actively absorbs moisture from the air around it. Sealed inside an airtight ammo can, it absorbs the residual humidity that was trapped at the time of sealing, then continues to absorb any micro-infiltration that occurs over time through minor seal imperfections.

Silica gel is the most common desiccant type for ammo storage. It absorbs moisture efficiently, is chemically inert (it won't react with brass or primer compounds), and includes color-indicator beads that change color when saturated — so you know exactly when to replace it without guessing.

Desiccare vs Generic Silica Gel — Why It Matters

Not all desiccant is created equal. Generic silica gel bags from Amazon or hardware stores vary in quality, capacity, and indicator reliability. For serious long-term ammo storage, Desiccare is the standard — it's what's included in the SCUSA ARMORY MAX kit and what the military uses for ammunition storage.

How Much Desiccant Per Can

For a standard MTM AC50C ammo can, one Desiccare 1/2 unit pack is the correct amount. More isn't better — an oversized pack wastes capacity and creates pressure on the seal. One pack per can, every time.

Where to Place the Desiccant in the Can

Drop the desiccant pack on top of the loaded clips before sealing — not underneath, not mixed in. On top means it's the first thing you see when you open the can for inspection, and it sits in the air space above the rounds where it's most effective at absorbing residual humidity.

How to Read the Indicator

Desiccare silica gel includes color-indicator beads visible through the pack:

Check the indicator annually when you open each can for inspection. If it's still blue — close it back up. If it's pink — swap the pack and reseal. That's the entire maintenance protocol.

Can You Recharge Used Desiccant?

Yes — Desiccare silica gel is rechargeable. Place saturated packs in an oven at 250°F for 2 hours and they return to full absorption capacity. The color indicator resets to blue when fully recharged.

The Full Annual Maintenance Checklist

Once a year, open each can and run through this 3-step check. Total time: 2–3 minutes per can.

1. Check the desiccant indicator — blue = good, pink = replace
2. Inspect the gasket — press firmly, should spring back immediately
3. Check the label — replace if faded or illegible

Reseal and return to the shelf. Set a calendar reminder for the same date next year. That's all the maintenance a properly built SCUSA storage system requires.

Build the Complete Storage System

Frequently Asked Questions

What is the best desiccant for ammo storage?

Desiccare silica gel desiccant is the best choice for long-term 5.56 ammo storage. It's made in the USA, mil-spec rated, includes a reliable color indicator, and is rechargeable. One 1/2 unit pack per MTM AC50C can is the correct amount for a properly sealed 5.56 storage system.

How often should I replace desiccant in ammo cans?

Every 2–3 years under normal conditions, or whenever the color indicator changes from blue to pink. Check annually when you open each can for inspection. If it's still blue, reseal and move on. If it's pink, swap the pack before resealing.

Can I use silica gel cat litter as desiccant for ammo?

Technically yes — silica gel cat litter is the same material and will absorb moisture. The practical problem is that it lacks a reliable color indicator, comes in bulk quantities that are hard to portion correctly, and has no consistent quality standard. For a storage system you're trusting for years, purpose-made desiccant packs with reliable indicators are the right tool.

Do I need desiccant if my ammo is factory sealed?

Factory-sealed cardboard boxes are not airtight. They allow moisture exchange with the environment. Once you open them and transfer rounds to an ammo can, you're creating a new sealed environment — and whatever humidity was in that environment when you sealed the can is now trapped inside with your ammo. Desiccant eliminates that trapped moisture.

Is Desiccare the same as the desiccant the military uses?

Desiccare produces mil-spec silica gel desiccant that meets military specifications for sealed ammunition storage. It's not a military surplus product — it's a purpose-manufactured civilian product built to the same standard. This is why it's included in the SCUSA ARMORY MAX kit and recommended for the complete SCUSA storage system.

Where can I buy Desiccare desiccant?

SCUSA sells Desiccare 1/2 unit packs in a 20-pack — enough for 20 AC50C cans. It's also included in the ARMORY MAX kit along with an AC50C ammo can, SLB Gen2, StripLULA, and all three clip colors.