I asked Grok what factors could help extend the life of elastic in storage...
Would a reduced oxygen environment help?
Yes. Oxygen (along with ozone in the air) reacts with the polymers in elastic, causing it to oxidize, stiffen, and eventually dry rot.
How to do it: You can create an oxygen-reduced environment by placing your elastics into heavy-duty barrier bags (like Mylar) and adding an Oxygen Absorber to drop oxygen levels to near zero. Alternatively, using a vacuum sealer works well to remove circulating air.
Would refrigeration help?
Yes, but with caveats. Heat is one of rubber’s worst enemies. Cool or refrigerated temperatures slow down the internal chemical reactions that cause degradation.
The Catch: If the temperature drops below freezing (below 32°F), natural rubber and latex can temporarily stiffen and become brittle. Fortunately, this is fully reversible once the elastic is brought back to room temperature.
How to do it: Place your sealed, oxygen-free bags into a standard refrigerator (not the freezer). This makes an ideal, energy-efficient preservation
Additional Best Practices
To ensure your elastic retains its stretch for years to come, follow these storage rules:
Block the Light: Ultraviolet (UV) light is extremely damaging to polymers. Store your elastic in opaque (dark) containers or bags.
Remove Tension: Never store elastic in a stretched state. Keep them relaxed.
Keep Away from Motors: Electric motors, generators, and high-voltage electrical equipment generate ozone, which is highly destructive to rubber.
Avoid Oils: Keep elastics completely away from lubricants, cleaning chemicals, and solvents.
When you are ready to use stored elastic, allow it to return to room temperature (around 70°) before applying tension.
Summerthyme