Seals are often stored as spare parts for a longer period of time. In order to avoid the external factors from affecting the physical and chemical properties of the O ring, thus damaging the elastomer, the following rules should be observed during storage:

- Store in a dry place. 

- The s torage temperature ranges from +5°C to +25°C, and avoid direct contact with heat source. 

- Avoid direct exposure to sunlight or neon light. 

- Keep in original boxes or airtight containers to prevent oxidation. 

- Keep away from harmful gas sources (e.g. ozone) to preven t damage to the elastomer. 

- Do not tie and hang O rings on nails or metal wires with thin cords , which may deform and damage
the O ring. 

- Discoloration and white powder (frosting) may occur during storage, but it does not affect the
function of the O ring.

The allowable dimension deviation of NBR O ring of 70 Shore A is shown in the table below: