Skip to main content

How To Keep Rubber From Dry Rotting Work __link__ May 2026

Stop the Crack: How to Keep Rubber from Dry Rotting for Good

  • Paraffin or polyethylene waxes in compounding bloom to surface form a physical barrier against ozone; can also be applied externally as topical coatings.
  • Limitations: wax can be abraded off; performance varies with temperature (can migrate at higher temps).
  1. Fundamentals: What dry-rot is and why it happens
  • Wrap with self-fusing silicone tape: This creates a flexible, UV-proof second skin that moves with the rubber. Excellent for hydraulic hoses and wire bundles.
  • Use split loom tubing: For rubber vacuum lines or air hoses, plastic loom prevents direct UV and ozone attack while allowing air circulation.
  • Apply 303 Aerospace Protectant: This is the gold standard for automotive and marine rubber. It contains no petroleum and offers UV-blocking plus plasticizer replenishment. It is safe for tires, trim, wiper blades, and weatherstripping.
  1. Choose the appropriate base elastomer for the application (EPDM for general outdoor; FKM/NBR for fuels/oils; silicone for high-temp/UV).
  2. Specify peroxide cure or low-unsaturation chemistries where ozone/oxidation is a concern.
  3. Use compounding additives: antioxidants, antiozonants, UV stabilizers, non-volatile plasticizers, and carbon black/fillers as needed.
  4. Store in cool, dark, ozone-free conditions in vapor-barrier packaging; avoid static strain.
  5. Shield vulnerable parts in service, reduce stress concentrations, and design for easy replacement of sacrificial components.
  6. Inspect regularly and replace when cracking, major hardness increase, or loss of elongation is evident.
  7. Avoid solvent-based dressings that extract plasticizers; use compatible conditioners when needed.
  8. Implement an asset lifecycle program with testing, documentation, and conservative replacement criteria.
  • Tensile strength, elongation at break, modulus, hardness (Shore A/D) compared to original specifications.
  • Dynamic mechanical analysis (DMA) to detect changes in Tg and viscoelastic behavior.
  • Swell tests in solvents to estimate crosslink density change.