What Is Ozone Cracking and How to Protect Elastomer Seals
Ozone attacks stretched, unsaturated rubber at concentrations as low as 50 pphm. How to identify it, which compounds survive, ASTM D1149 test conditions and five fixes.
2026-11-13
Welcome to the BOSS Sealing Knowledge Base — a practical library of professional sealing know-how, written by our engineers. Here we share technical guides and field experience covering o-rings and hydraulic & pneumatic seals: material selection and comparison (NBR, FKM, EPDM, HNBR, silicone, PU, FFKM, FEP/PFA, PTFE, PEEK), seal design and groove dimensions, installation best practices, failure analysis, and international manufacturing standards such as ISO 3601, AS568 and JIS B 2401.
Whether you are an engineer specifying seals for hydraulic cylinders, a purchasing manager comparing encapsulated o-rings and spring energized seals, or a maintenance technician troubleshooting leaks, you will find clear, experience-based answers here. All articles are based on real production and application cases from our factory.
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Ozone attacks stretched, unsaturated rubber at concentrations as low as 50 pphm. How to identify it, which compounds survive, ASTM D1149 test conditions and five fixes.
One question settles the choice: is the fluid polar or non-polar? Plus the temperature ceilings, the compatibility matrix and the cost arithmetic.
ISO 2230 groups, the storage conditions that actually matter, and how to date stock by cure date instead of receipt date.
What 200 °C does to an elastomer, which material family survives it, and the hardware changes each one demands. A selection workflow for hot joints.