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2. Ozone cracking - Wikipedia

   en.wikipedia.org/wiki/Ozone_cracking

   Macrophotograph of ozone cracking in NBR (Nitrile Butadiene Rubber) diaphragm seal. Ozone cracks form in products under tension, but the critical strain is very small. The cracks are always oriented at right angles to the strain axis, so will form around the circumference in a rubber tube bent over.

3. Neoprene - Wikipedia

   en.wikipedia.org/wiki/Neoprene

   Neoprene's burn point is around 260 °C (500 °F). [21] In its native state, neoprene is a very pliable rubber-like material with insulating properties similar to rubber or other solid plastics. Neoprene foam is used in many applications and is produced in either closed-cell or open-cell form.

4. Vulcanization - Wikipedia

   en.wikipedia.org/wiki/Vulcanization

   The term originally referred exclusively to the treatment of natural rubber with sulfur, which remains the most common practice. It has also grown to include the hardening of other (synthetic) rubbers via various means. Examples include silicone rubber via room temperature vulcanizing and chloroprene rubber (neoprene) using metal oxides.

5. Gasket - Wikipedia

   en.wikipedia.org/wiki/Gasket

   Compressed fiber gasket. Gaskets are normally made from a flat material, a sheet such as paper, rubber, silicone, metal, cork, felt, neoprene, nitrile rubber, fiberglass, polytetrafluoroethylene (otherwise known as PTFE or Teflon) or a plastic polymer (such as polychlorotrifluoroethylene).

6. O-ring - Wikipedia

   en.wikipedia.org/wiki/O-ring

   Typical O-ring and application. An O-ring, also known as a packing or a toric joint, is a mechanical gasket in the shape of a torus; it is a loop of elastomer with a round cross-section, designed to be seated in a groove and compressed during assembly between two or more parts, forming a seal at the interface.

7. Is It Holiday Fatigue Or Covid-19? Here Are The Symptoms To ...

   www.aol.com/holiday-fatigue-covid-19-symptoms...

   If you're traveling for the holidays, you're probably feeling a bit worn-down—but is it just fatigue, or could it be COVID-19?. It’s probably been a minute since you last thought about COVID ...