Rubber’s physical properties change over time. The rate depends on the compound and exposure conditions. Reinforcement materials can also deteriorate under unsuitable storage conditions. The following practices help limit storage-related aging.
1. Storage time
Use a stock-rotation system to minimize storage time. Inspect hoses thoroughly before use after prolonged storage, particularly where recommended conditions could not be maintained.
2. Physical conditions
Avoid stretching, compression, deformation and sharp objects. Use suitable racks or a clean, dry floor. Store coils flat. Avoid stacking; if stacking is unavoidable, ensure the lower hoses are not permanently deformed. Avoid hanging hoses around posts or hooks. Store straight-delivered hoses flat and straight.
3. Contact with other materials
Keep hoses away from solvents, fuels, oils, grease, unstable chemicals, acids, disinfectants and organic liquids unless the material is specifically compatible. Certain metals and compounds can accelerate deterioration. Avoid contact with PVC and creosote-treated wood or fabric.
4. Temperature and humidity
Recommended storage temperature: 10–25°C. Avoid temperatures above 40°C or below 0°C. Handle hoses with particular care below −15°C. Keep them away from heat sources. Relative humidity should preferably remain below 65%.
5. Heat sources
Observe the temperature limits above. Where necessary, use thermal insulation to protect stored hoses from heat.
6. Light
Keep the storage area dark and protect hoses from direct sunlight and strong artificial light. Cover windows and glazed openings where required.
7. Oxygen and ozone
Package hoses appropriately or use closed containers to reduce exposure to air. Keep ozone-generating equipment out of the storage area.
8. Electrical and magnetic sources
Avoid storage near high-voltage cables, high-frequency generators or other equipment that creates strong electrical or magnetic fields.